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searching for Potassium feldspar 66 found (121 total)

Sanidine (750 words) [view diff] exact match in snippet view article find links to article

Sanidine is the high temperature form of potassium feldspar with a general formula K(AlSi3O8). Sanidine is found most typically in felsic volcanic rocks

Quartz diorite (170 words) [view diff] exact match in snippet view article find links to article

as plagioclase (typically oligoclase or andesine) with 10% or less potassium feldspar. Quartz is present at between 5 and 20% of the rock. Biotite, amphiboles

Orthoclase (598 words) [view diff] exact match in snippet view article find links to article

cleavage planes are at right angles to each other. It is a type of potassium feldspar, also known as K-feldspar. The gem known as moonstone (see below)

Coconino Sandstone (490 words) [view diff] exact match in snippet view article find links to article

primarily of fine well-sorted quartz grains, with minor amounts of potassium feldspar grains deposited by eolian processes (wind-deposited) approximately

Perthite (335 words) [view diff] exact match in snippet view article find links to article

(35 ft) × 4.6 m (15 ft) × 1.8 m (5 ft 11 in). The gem varieties of potassium feldspar, amazonite and moonstone are variant colored perthites. Le Maitre

Amazonite (1,441 words) [view diff] exact match in snippet view article find links to article

as amazonstone, is a green tectosilicate mineral, a variety of the potassium feldspar called microcline. Its chemical formula is KAlSi3O8, which is polymorphic

Hyalophane (265 words) [view diff] exact match in snippet view article find links to article

feldspar group of tectosilicates. It is considered a barium-rich potassium feldspar. Its chemical formula is (K,Ba)[Al(Si,Al)Si2O8], and it has a hardness

Asind (559 words) [view diff] exact match in snippet view article find links to article

This mine is enriched with one India's unique mineral deposit of Potassium feldspar, Quartz and mica and can meet any quantity at very short span of period

Icart Point (612 words) [view diff] exact match in snippet view article find links to article

Icart Gneiss, an augen gneiss of granitic composition containing potassium feldspar. This was formed from a granite dated at 2,018 million years ago using

Puntukas (459 words) [view diff] exact match in snippet view article find links to article

of Rapakivi granite. Its reddish mass includes large crystals of potassium feldspar surrounded by green rings of oligoclase. In 1943, sculptor Bronius

Myrmekite (1,508 words) [view diff] exact match in snippet view article find links to article

quartz-plagioclase intergrowths are associated with and commonly in contact with potassium feldspar. Myrmekite is formed under metasomatic conditions, usually in conjunction

K–Ca dating (1,454 words) [view diff] no match in snippet view article find links to article

easily quantified. Examples of such minerals include lepidolite, potassium-feldspar, and late-formed muscovite or biotite from pegmatites (preferably

Moonstone (gemstone) (391 words) [view diff] exact match in snippet view article

A solid solution of the plagioclase feldspar oligoclase +/− the potassium feldspar orthoclase also produces moonstone specimens. Deposits of moonstone

Gamma ray logging (869 words) [view diff] exact match in snippet view article find links to article

radiation. For instance, sandstones can contain uranium minerals, potassium feldspar, clay filling, or lithic fragments that cause the rock to have higher

Sevilleta Metarhyolite (501 words) [view diff] exact match in snippet view article find links to article

metarhyolite with abundant potassium feldspar phenocrysts. The modal composition is 25% quartz, 30% plagioclase, 40% potassium feldspar, 1% muscovite, 1% biotite

Monzogranite (1,288 words) [view diff] exact match in snippet view article find links to article

syn-F3 biotite granitoid group. They present a porphyritic texture (potassium feldspar megacrysts) and mafic microgranular enclaves that decrease in frequency

Cibola gneiss (366 words) [view diff] exact match in snippet view article find links to article

typical modal composition is 35% quartz, 30% plagioclase, and 20% potassium feldspar, 7% muscovite, 6% biotite, 1% opaques, and 1% trace minerals. The

Leucitite (1,393 words) [view diff] exact match in snippet view article find links to article

leucite is incompatible with free quartz and reacts with it to form potassium feldspar. Because it weathers rapidly, leucite is most common in lavas of recent

Riadino-5 Site (1,864 words) [view diff] no match in snippet view article find links to article

findings of flint artifacts, using luminescence IRSL dating based on potassium-feldspar sample size and Carbon-14 dating of charcoal and ash layers from the

Pegmatite (3,231 words) [view diff] exact match in snippet view article find links to article

Île de Noirmoutier, France Pegmatite (pink), Isle of Skye, Scotland Potassium feldspar pegmatites at the Black Canyon of the Gunnison National Park, Colorado

Monzonite (895 words) [view diff] exact match in snippet view article find links to article

resembling quartz monzonite or granite, by altering plagioclase to potassium feldspar and emplacing hydrothermal quartz. Fragments of monzonite have been

Graniteville, Staten Island (732 words) [view diff] exact match in snippet view article find links to article

as the quarry actually contained no granite. Granite is made of potassium feldspar. The rock at the quarry is composed of sodium feldspar. Also, professor

Microcline (633 words) [view diff] exact match in snippet view article find links to article

Greek "small slope". It is a fully ordered triclinic modification of potassium feldspar and is dimorphous with orthoclase. Microcline is identical to orthoclase

Geology of Guernsey (735 words) [view diff] exact match in snippet view article find links to article

Icart Gneiss is an augen gneiss of granitic composition containing potassium feldspar. This was formed from a granite dated at 2,061 million years ago using

Mount Cardigan (592 words) [view diff] exact match in snippet view article find links to article

Cardigan Pluton (a foliated granitic body with large megacrysts of potassium feldspar). The Cardigan pluton has been dated by the Rb/Sr method at 411 +/-

Greensand (1,328 words) [view diff] exact match in snippet view article find links to article

sedimentary rock, laminated, bluish-green, composed of glauconite (40–80%), potassium feldspar (10–15%), quartz (10–60%), muscovite (5%) and minor quantities of

Geology of Brazil (1,978 words) [view diff] exact match in snippet view article find links to article

subduction by around 750 million years ago in the Katangan episode. High potassium feldspar granites, gabbro and diorite emplaced following the Pan-African orogeny

Sandia granite (382 words) [view diff] exact match in snippet view article find links to article

veins are common. The average modal composition is 28% quartz, 25% potassium feldspar, 38% plagioclase, 8% biotite, and 1% accessory minerals, including

Davinciite (254 words) [view diff] exact match in snippet view article find links to article

massif, Kola Peninsula, Russia. Aegirine, delhayelite, nepheline, potassium feldspar, shcherbakovite, sodalite (silicates), djerfisherite, rasvumite (sulfides)

Sial (685 words) [view diff] exact match in snippet view article find links to article

Typical sial material, a Precambrian granite from St. Francois Mountains, Missouri, showing the potassium feldspar (felsic) matrix

Glauconite (957 words) [view diff] exact match in snippet view article find links to article

sedimentary rock, laminated, bluish-green, composed of glauconite (40-80%), potassium feldspar (10-15%), quartz (10-60%), muscovite (5%) and minor quantities of

Torran Rocks (1,047 words) [view diff] no match in snippet view article find links to article

Torrain. The southern group of rocks and Ruadh Sgeir are formed from potassium-feldspar-phyric monzogranite intruded as part of the Caledonian Igneous Supersuite

Morton Gneiss (827 words) [view diff] exact match in snippet view article find links to article

nebulae floating in space. The rock's colors come from quartz (white), potassium feldspar (pink), plagioclase feldspar (light gray), and biotite and amphibole

Jun Nishida (1,385 words) [view diff] no match in snippet view article find links to article

mixed with glaze and poured into spherical or cuboid containers. The potassium-feldspar glaze was notably used as a structural material in its powdered form

Trachyte (2,091 words) [view diff] exact match in snippet view article find links to article

with alternating microscopic bands of sodium feldspar (albite) and potassium feldspar (sanidine). Trachytes are typically fine-grained and light-colored

Geology of Thailand (1,316 words) [view diff] exact match in snippet view article find links to article

small and isolated with biotite and muscovite-rich granite as well as potassium feldspar megacrysts, hornblende and large mica-tourmaline or lepidolite pegmatites

Feldspar (2,434 words) [view diff] exact match in snippet view article find links to article

in common feldspars can be expressed in terms of three endmembers: potassium feldspar (K-spar) endmember KAlSi3O8 albite endmember NaAlSi3O8 anorthite endmember

Labyrinthite (378 words) [view diff] exact match in snippet view article find links to article

with aegirine, alkaline amphibole, lamprophyllite, lomonosovite, potassium feldspar, pectolite, sodalite, and villiaumite. Beside that given in the formula

Granulite (1,505 words) [view diff] exact match in snippet view article find links to article

biotite may break down at high temperatures to form orthopyroxene + potassium feldspar + water, producing a granulite. Other possible minerals formed at

Mount Cayley volcanic field (6,987 words) [view diff] exact match in snippet view article find links to article

orthopyroxene and orthoclase crystals, along with rare quartz and possible potassium feldspar xenocrysts. A portion of the southwestern flank of Mount Fee displays

Clastic rock (2,642 words) [view diff] exact match in snippet view article find links to article

oxide (if oxygenated pore water is present). The precipitation of potassium feldspar, quartz overgrowths, and carbonate cements also occurs under marine

Sebago Granite (888 words) [view diff] exact match in snippet view article find links to article

This Sebago Granite is a 2-mica granite, and is mainly composed of potassium feldspar, quartz, biotite, and muscovite. Its composition is homogeneous in

Idaho Batholith (942 words) [view diff] exact match in snippet view article find links to article

Atlanta peraluminous suite by the presence of hornblende and 10 cm long potassium feldspar megachrysts. Like the early metaluminous suite, the border zone suite

Abo Formation (1,901 words) [view diff] exact match in snippet view article find links to article

Mountains, tends to be arkosic, with detrital feldspars dominated by potassium feldspar including microcline. The feldspar is locally albitized, possibly

Ouki (2,062 words) [view diff] exact match in snippet view article find links to article

left deposits containing amphibole, illite, plagioclase feldspar, potassium feldspar, kaolinite, pyroxene, quartz and smectite. Various radiometric dates

Sandia Mountains (2,317 words) [view diff] no match in snippet view article find links to article

However, most of the fossils are too small for the human eye to detect. Potassium-feldspar (K-spar) crystals embedded within the Sandia granite give the mountains

Lilesville Granite (1,110 words) [view diff] exact match in snippet view article find links to article

sections, while granodiorite tends to dominate the thinner sections. Potassium feldspar is also noticeably more prevalent as the pluton gets thicker, suggesting

Grenville orogeny (2,738 words) [view diff] exact match in snippet view article find links to article

compression cycles and isotope analysis of hornblende, biotite, and potassium feldspar suggest that extension was occurring when compression had momentarily

Dharwar Craton (3,536 words) [view diff] exact match in snippet view article find links to article

with a granitic composition of quartz and feldspar but contain less potassium feldspar. In Archean craton, TTG rocks are usually present in batholiths formed

Yunfu (1,475 words) [view diff] exact match in snippet view article find links to article

sillimanite, dolomite, barite, talc, kaolin, limestone, clay, rammell, potassium feldspar, and mineral water.[citation needed] The area's particularly large

Pikes Peak (3,137 words) [view diff] exact match in snippet view article find links to article

called Pikes Peak granite. The color is due to a large amount of potassium feldspar. It is thought that the granite was once magma that crystallized at

Ranney Hill (678 words) [view diff] exact match in snippet view article find links to article

The hill rises out of a large field of pink granite (pink from high potassium feldspar). Beds of these small rounded boulders lie at the immediate base of

Geology of Cape Town (3,020 words) [view diff] exact match in snippet view article find links to article

rich in kaolin clays, decomposed from the large visible crystals of potassium feldspar that are so conspicuous in the granite. The contact zone where the

Gai-As Formation (1,329 words) [view diff] exact match in snippet view article find links to article

well-preserved former glass shards, now mainly replaced by barite, are rich in potassium feldspar and have a porcelain-like appearance. The Gai-As Formation as a whole

Crystal twinning (5,782 words) [view diff] exact match in snippet view article find links to article

a pseudomorphic crystal that appears to have isometric symmetry. Potassium feldspar likewise experiences polysynthetic twinning as it transforms from

Tin-glazing (3,760 words) [view diff] exact match in snippet view article find links to article

10% Whiting: 2% Flint, calcined: 4% Tin oxide: 10% And another is: Potassium feldspar: 65% Limestone: 11% Silica: 11% Zinc oxide: 9% Tin oxide: 4% In combination

Lockatong Formation (3,255 words) [view diff] exact match in snippet view article find links to article

various other minerals. Calcite, analcime, albite, dolomite, and potassium feldspar are all known to occur within Lockatong crystal clasts. Although gypsum

Salton Buttes (3,690 words) [view diff] case mismatch in snippet view article find links to article

County, California, Through Infrared Stimulated Luminescence Dating of Potassium Feldspar from Tuffaceous Sediment" (PDF). California Archaeology. 11 (1): 5–20

Potassium (10,766 words) [view diff] exact match in snippet view article find links to article

reacts violently with water and also reacts with oxygen. Orthoclase (potassium feldspar) is a common rock-forming mineral. Granite for example contains 5%

Cornubian batholith (4,397 words) [view diff] exact match in snippet view article find links to article

abundant Li mica, Tregonning Granite. Mineral name abbreviations: Kfs = potassium feldspar, Bt= biotite, Msc = muscovite, Qtz = quartz, Tur = tourmaline, Mca

Ita Mai Tai (3,568 words) [view diff] exact match in snippet view article find links to article

picrites, tholeiites, trachytes and trachybasalt; volcanic rocks contain potassium feldspar and plagioclase. The volcanic rocks have been subdivided into a lower

Glossary of geology (10,307 words) [view diff] exact match in snippet view article find links to article

igneous rock similar to granite but containing more plagioclase than potassium feldspar. Dacite is the volcanic equivalent. gravel graywacke A variety of

Soil matrix (4,870 words) [view diff] no match in snippet view article find links to article

and the degree of swelling depends on the degree of weathering of potassium-feldspar. The active surface area is reduced due to the potassium bonds. Illite

Lake Cahuilla (9,519 words) [view diff] case mismatch in snippet view article find links to article

County, California, Through Infrared Stimulated Luminescence Dating of Potassium Feldspar from Tuffaceous Sediment" (PDF). California Archaeology. 11 (1): 5–20

Geology of Tasmania (11,147 words) [view diff] exact match in snippet view article find links to article

20% clinopyroxene, 20% quartz, 5% ilmenite and small percentages of potassium feldspar and amphibole. The rock is altered by water to smectite and kaolinite

Xiaodeng Island (5,412 words) [view diff] exact match in snippet view article find links to article

clear at low tide.: 391 : 352 There are mainly minerals such as potassium feldspar, construction sand, and other rich salt resources in Xiaodeng Island