Term
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Definition
Texure: Greasy
Color: White, yellow, rose
cleavage: no cleavage
hardness: 7 |
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Term
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Definition
texture: brittle
color: colorless, white, yellow, blue, brown, red
cleavage: 3 cleavages, intersect at 90 degrees, cubic
hardness: 2.5 |
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Term
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Definition
color: white, gray, orange, brown, green, pink
cleavage: 2 cleavages at nearly right angles
hardness: 6 |
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Term
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Definition
Color: colorless, white, yellow, green, pink, brown
cleavage: 3 cleavages that don't intersect at 90 degrees, rhombohedrons
hardness: 3 |
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Term
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Definition
color: colorless, purple, blue, grey, green, yellow
cleavage: 4 main cleavages, octahedral
hardness: 4 |
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Term
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Definition
Texture: brittle
color: dark grey, gold, metallic
cleavage: absent to poor
hardness: 6-6.5 |
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Term
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Definition
composition: plagioclase feldspar, ferromagnesian minerals such as amphibole
texture: phaneritic
color: intermediate "salt and pepper" |
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Term
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Definition
composition: shale, claystone, slatem clay, chlorite, mica
texture: wavy, wrinkled foliation
color: green, silver, brass
cleavage: foliated |
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Term
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Definition
composition: quartz, feldspar, biotite, amphibole
texture: phaneritic
color: light, pink, gray, white
felsic |
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Term
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Definition
composition: quartz, feldspar, hornblende
texture: aphantic
color: light grey/pink
felsic |
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Term
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Definition
composition: ferromaknesium, plagioclase=>augite
color: greenish/ dark grey
mafic |
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Term
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Definition
composition: plagioclase and ferromagnesian-pyroxene, olivine, magnetite
texture: vescicular (bubbly)
color: dark grey-black
extrusive=gabbro
most abundant aphantic igneous rocks |
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Term
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Definition
composition: plagioclase feldspar, ferromagnesium
color: medium to dark grey
extrusive=diorite
intermediate |
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Term
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Definition
composition: sand sized grains
texture: rough
reacts with HCL |
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Term
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Definition
composition: quartz, feldspar, mica, clays, calcite
Texture: well rounded grains |
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Term
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Definition
texture: fine grained/none visible
color: dull
cleavage: breaks hard sheets or crumbles into blocks |
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Term
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Definition
compostion: clay, chlorite, mica, muscovite, biotite
visible micas
texture: med-coarse grained, scaly, foliated
color: visible sparkles
cleavage: slaty, sets tiny folds, breaks along scaly glittery form |
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Term
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Definition
texture: foliated
color: dark/dull
cleavage: breaks into hard flat sheets
microscopic micas |
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Term
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Definition
composition: light-quartz, feldspar; dark- mica, hornblende, and tourmaline
texture: med to coarse grained, foliated
color: alternating layers of light and dark |
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Term
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Definition
composition: sand sized grains
harndess: 5+ |
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