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CaSO4*2H2O I t build minerals(plaster,etc), ceramics AND clear to white color,Translucent , Silky luster, Fibrous crystals cleavage 1 direction

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Gypsum

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Geology - Leaderboard

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Geology - Details

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1) Chapter 1 View

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55 questions

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CaSO4*2H2O I t build minerals(plaster,etc), ceramics AND clear to white color,Translucent , Silky luster, Fibrous crystals cleavage 1 direction

Gypsum

NaCl Table salt, chemical industry, meat preservative AND clear / white color 3 cleavage at 90'(cubic) feels greasy if held in hand salty taste luster waxy

Halite

CaCO3 cement, lime, optical lense AND clear to white/yellow 3 cleavages at 75' and Translucent Transpar. may double refractive acid fizz

Calcite

Color clear/yellow/blue/green/violet 4 cleavage (octahed) translucent/transparent, cubic xtal form, vitreous luster

Fluorite

Mg(Si4O10)(OH)2 And color green to blue/ grey to white, soapy feel, cleavage 1 direction, hard to detect

Talc

Blac color, gold weathering flecks, stacked thin sheets, translucent to transparent

Biotite

Colorless to silverish-grey:cellophane like, thin elastic sheets, translucent to transparent

Muscovite

Molted yellowish-brown colors, cleavage 6 directions, not all visible, streak pale yellow, luster vitreous to resinous

Sphalerite

Bright to dark grass green, streak green, often encrusting habit, sometimes smooth irregular masses; or straining

Malachite

Deep "azure blue" color, streak blue, often encrusting habit;sometimes smooth irregular masses

Azurite

Al2O3*2H2O Aluminum source, sandpaper abrasive AND Beige-brown color,form rounded pea- like masses (pisolitic), often waxt to dull luster, opaque

Bauxite

Al4Si4O10(OH)8, Pottery, stoneware, brick, porcelain, china, and ceramics, paper, medicine, cosmetics, AND white, earthy, chalky masses, easily scratched with fingernails, earthy odor, grainy to fine particles

Kaolinite

Brass yellow color, conchoidal fracture, striations, streak greenish-black, cubic xtals and aggregates

Pyrite

Fe3O4, Iron and steel, natural magnets, motors and electrical applications AND often dark color, streak black to grey, magnetic, rusty appearance

Magnetite

Fe2O3, source of iron AND streak red/brown, sometimes "flesh" of metal, rich red color, tarnishes red-brown, dull, rich bricks red color, earthy

Hermatite

Fe2O3*nH2O, pigment, source of iron AND orange-brown or rusty yellow, dull earthy, streak yellow or brown, often non-metallic, often sandy

Limonite

FeCr2o4, source of chrome; non rusting surfaces; aircraft parts AND black or brownish black color, granular aggregate, streak brown black, fracture

Chromite

PbS, source of lead, fishing weights, x-ray shielding equipment AND 3 directions of cleavage, perfect cubic, silvery grey color, marks paper, streak grey/ black

Galena

C, lubricants, pencil lead AND grey to black, bloblike mass, marks paper easily, greasy feel streak grey/black

Graphite

Dark greenish to dark greenish black, cleavage 2 planes at nearly 90'

Augite

Salmon pink color cream, 2 cleavages at nearly 90', often has crooked shallow lines on flat surfaces

Orthoclase

"tooth white" color, white with light bluish tinge, may also has crooked lines,cleavages at nearly 90'

Plagioclase

Olive green to black color, appears "sugary", small, translucent grains,which fall off, bo streak

Olivine

Translucent-transparent xtals, no streak, may be horizontally striated, conchoidal fractures, 6 sided xtals taper to a point glassy luster

Quartz

Dark grey, often light outer "skin" opaque "sparks" with iron, conchoidal fracture, waxy or dull luster, microcrystalline

Flint

Texture is Phaneritic light pink orange color

Granite (Felsic)

Texture is Phaneritic white black specks

Diorite (intermediate)

Dark color, texture is Phaneritic

Gabbro (mafic)

Texture Aphanitic greyish pink

Rhyolite (felsic)

Texture Aphanitic , greyish silivercolor

Basalt (Mafic)

Brownish color texture Porphyritic

Andesite Porphyry (Intermediate)

Texture Hyaline (glassy) Color black

Obsidian (all compsition)

Texture Vesicular color whitish brown

Pumice (Felsic)

Pinkish and dark greyish color texture Vesicular

Scoria (Intermediate/Mafic)

Clay-sized particles (less than 1/16mm), layered, soft, often brown or black

Shale

Fine grained; breaks into flat pieces, marked by silky, silvery luster as though rubbed by pencil lead along flat surface, shale and Siltstone

Phyllite

Granules, pebbles & gravel greater than 2mm in size , Angular clasts

Breccia

Granules, pebbles & gravel greater than 2mm in size, Rounded Clasts

Conglomerate

CaS*OHO, Creamy with grey swirls, soft, waxy luster

Rock Gypsum

NaCl, salty taste, typically interlocking crystals, color clear to white and translucent, sometimes grayish from impurities, will sweat, becoming slippery or greasy if held in hand for a minute

Rock Salt

CaCO3, Cream, tan to brownish in color, dense, crystal microscopic, fizzes strongly with HCI

Fine grained limestone

(Ca,Mg)2CO3 Greyish-blue, interlocking crystals, fizzes with HCL only if scratched

Dolostone (Dolomite)

Black, dull luster, brittle, black easily smudges off on finger, composed of carbon (C)

Coal

Brown, decayed plant fibers. Soft organic matter composed of carbon (C)

Peat

White, sift, leaves chalk residue. fizzes with HCL. composed of CaCO3

Chalky Limestone

Fossils or imprints of fossil embedded in dense limestone. fizzes with HCL, dense, composed of CaCO3

Fossiliferous Limestone

Porous, cemented shell fragments, fizzes strongly with HCL,CaCO3

Coquina

Fined grained, breaks into flat pieces, very compact, dense, with dull sheen on smooth surface

Slate

Fine grained, breaks into flat pieces, marked by silky, silvery luster as though rubbed by pencil lead along flat surfaces

Phyllite

Medium grained micas visible - glitter to fish scale like. Breaks uneven and wavy surfaces

Mica Schist

Coarse grained;minerals have segregated into altering "layers" of light and darked colored bands

Gneisis

Very coarse; broken and flattened quartz pebbles, dense and hard (SiO)

Quartz Metaconglomerate

Smaller crystals masses often "sugary", large crystalline masses often glassy or greasy in appearance, very hard, color visible (SiO2)

Quartzite

Fine grained, shades of green;espically "pistachio green: or :chlorite ggreen", dense, (variety of mineral composition)

Serpentine

Coarsely crystalline, often waxy luster, color varies, tends to be cream to white, grey, sometimes orange or dense swirls, fizzes mildy with HCL. (CaCO3)

Marble