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Petrology > 1st Lab Quiz Prep > Flashcards

1st Lab Quiz Prep Flashcards

1
Q

formula

Quartz

A

SiO2

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2
Q

physical & optical properties

Quartz

A

no cleavage, undulatory extinction

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3
Q

formula

Alkali Feldspar

A

K(AlSi3O8)

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4
Q

formula

Amphibole

A

(Ca,Na)2(Mg,Fe,Al)5(Al,Si)8O22(OH)2

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5
Q

physical & optical properties

Amphibole

A

two cleavages at 120 & 60, greenish brownish pleochroism

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6
Q

physical & optical properties

Alkali Feldspar

A

6-6.5 Hardness, tartan twinning

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7
Q

formula

biotite

A

K(Mg, Fe)AlSi3O10(F, OH)2

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8
Q

physical & optical properties

biotite

A

platy habit, 3rd-4th order interference colors & green brown yellow pleochroism

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9
Q

formula

Clinopyroxene

A

(Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)2O6

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10
Q

physical & optical properties

clinopyroxene

A

2 cleavages @ 90, high relief

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11
Q

formula

orthopyroxene

A

MgSiO3

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12
Q

physical & optical properties

orthopyroxene

A

1 good cleavage, 1st order white-yellow

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13
Q

formula

olivine

A

(MgFe)2SiO4

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14
Q

physical & optical properties

olivine

A

green in hand sample, high relief and colorless in ppl

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15
Q

formula

magnetite

A

Fe2+Fe3+2O2

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16
Q

physical & optical properties

magnetite

A

magnetic, opaque

17
Q

formula

ilmenite

A

Fe2+TiO3

18
Q

physical & optical properties

ilmenite

A

black streak and nonmagnetic, opaque

19
Q

formula

Plagioclase Feldspar

A

(Na,Ca)(Si,Al)4O8

20
Q

physical & optical properties

Plagioclase Feldspar

A

exsolution lamellae, colorlessin ppl

Petrology (2 decks)

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