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Geology > Rock ID's > Flashcards

Rock ID's Flashcards

1
Q

Granite

A

Phaneritic, quartz, feldspar, 10% black minerals

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2
Q

Diorite

A

phaneritic, chunky, reflective. plag and hornblende, 50/50 split black and white

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3
Q

Gabbro

A

Phaneritic, Dark, visible grains, chunky, 90% dark minerals

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4
Q

Andesite

A

aphanitic, gray, dull

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5
Q

Rhyolite

A

aphanitic, light pink, dull

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6
Q

Basalt

A

aphanitic, black, dull

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7
Q

Rhyolite Porphyry

A

light pink, dull, a few phenocrysts

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8
Q

Andesite Porphyry

A

gray, dull, a few phenocrysts

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9
Q

Basalt Porphyry

A

black, dull, a few phenocrysts

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10
Q

Pumice

A

holes, floats

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11
Q

Scoria

A

holes, sinks

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12
Q

Obsidian

A

glassy, conchoidal fractures

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13
Q

Arkose

A

detrital, sand sized, quartz and pot. feldspar

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14
Q

Siltstone

A

detrital, microscopic grains, gritty on teeth,

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15
Q

Breccia

A

detrital, gravel sized grains, angular grains, ,

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16
Q

Shale

A

detrital, microscopic grains, fissle, would break

17
Q

Conglomerate

A

detrital, rounded gravel,

18
Q

Quartz Sandstone

A

detrital, sand sized grains, quartz composition

19
Q

chalk

A

fizzes with acid, white

20
Q

Bauxite

A

round pebbles (gravel sized), too round for conglomerate, no fizz

21
Q

Chert

A

cuts glass, no fizz, microcrystalline, smooth feel, breaks sharply.

22
Q

Fossiliferous Limestone

A

fizzes, has gravel sized fossils

23
Q

Micritic Limestone

A

fizzes, microcrystalline

24
Q

Rock Salt

A

clear, salty taste,

25
Q

Coal

A

no fizz, black, blocky, marks paper

26
Q

Dolomite

A

microcrystalline, delayed fizz

27
Q

Oolitic Limestone

A

fizzes, has sand sized grains.

28
Q

Schist

A

visible mica flakes aligned in same direction

29
Q

Quartzite

A

sand grains without spaces, cuts glass no fizz

30
Q

Anthracite

A

black, marks paper (weaker than coal)

31
Q

Gneiss

A

black and white bands running in same direction

32
Q

Marble

A

reflective cleavage planes, reacts to acid

33
Q

Slate

A

thin, flat, smooth, harder than Shale

34
Q

Phyllite

A

shiny not flat like Slate, wavy

Geology (4 decks)

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