Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Mineralogy > Quiz 3 > Flashcards

Quiz 3 Flashcards

1
Q

Epidote

Sorosilicates

A

**Ca, Al, Fe, Si
Ca2(Al,Fe)2(SiO4)3(OH)

SF: Greenish color and common crystal habits
Envi: meta; hornfels, skarns, meta limestones, schists; ig; basalt, granite peg
IG, SED, META

H: 6-7
C: 1,1
F: uneven
L: vitreous
Cr Habits: long, slender crystals;
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Clinozoisite

Sorosilicates

A

**Ca, Al, some iron
Ca2Al2(Al, Fe3+)OOH

SF: color, cleavage, envi
Envi: contact meta; hornfels, skarns, meta limestones
META

H: 7
C: 1,1
F: uneven
L: vitreous
Cr Habits: prismatic, elongated crystals;
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Beryl

Ring Silicates/Cyclosilicates

A

Be3Al2SiO6

SF: crystal form, hardness
Envi: ig; granite peg, rhyolite deposits; meta; mica schists

H: 7.5-8
C: 3,1; basal
F: uneven to conchoidal
L: vitreous, waxy
Cr Habits: hexagons,
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Tourmaline (schorl, elbaite, dravite)

Ring Silicates/Cyclosilicates

A

Tourmaline: B
Schorl: Fe
Elbite: Li
Dravite: Mg

SF: color, crystal form, hardness, deep vertical striations
Envi: schorl, elbaite = granite peg; dravite = meta
IG, META

H: 7-7.5
C: 3,2
F: conchoidal to uneven
L: vitreous; black and brown may be dull
Cr Habits: elongated or stubby, prismatic crystals, striated; rounded triangular cross section
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Augite

A

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

SF: Color, crystal habits, cleavage, and environment
Envi: ig; basalt, diabase, gabbro, peg; meta; serpentine deposits
IG, META

H: 5-6
C: 1,2; may have parting
F: uneven to splintery
L: vitreous, dull
Cr Habits:
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Diopside

A

CaMgSi2O6

SF: color, cleavage angles
Envi: contact/regional meta; hornfels and skarn hydroT deposits
META

H: 5-6
C: 1,2; may have parting
F: vitreous to dull
L: uneven, splintery
Cr Habits:
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Spodumene

A

LiAlSi2O6
SF: Distinct crystal habit, cleavage angles, and hardness
Envi: ig; lithium bearing peg
IG

H: 6.5-7
C: 1,2
F: uneven, splintery
L: vitreous, silky
Cr Habits: most often as long, flat, prismatic crystals; rectangular crystals, tabular, bladed, as elongated crystals
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Wollastonite

A

CaSiO3

SF: Cleavage angle, crystal habit,
Envi: meta; hornfels and marbles
META

H: 4.5-5
C: 1,2
F: uneven, splintery
L: vitreous to silky
Cr Habits: rarely single crystals; often twinned; usually fibrous, radiating, grainy, bladed, massive, as cleavage fragments, and as compact groupings of elongated tabular crystals
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Pectolite

A

NaCa2Si3O8(OH)

SF: Crystal habits and mineral associations
Envi: usually ig; veins of basalt/diabase; meta serpentine deposits
IG, META

H: 4.5-5
C: 2,2; forms at angle near 90 degrees
F: splintery; uneven
L: vitreous, splintery
Cr Habits: single crystals are very rare; fibrous, radiating veins;
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Hornblende

A

Mg, Fe2+, Fe3+, Al

SF: Color, crystal aggregates, and cleavage angle of amphibles
Envi: rock forming material;
IG, META

H: 5-6
C: 2,2; prismatic
F: uneven, splintery
L: vitreous, submetallic, dull
Cr Habits:  prismatic or tabular crystals with a diamond-shaped cross-section; not usually single crystals
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Tremolite - Actinoite

A

Ca2(Mg,Fe)5Si8O22(OH)2

SF: crystal habit and cleavage angle of amphiboles
Envi: contact meta; hornfels and skarns, serpentine deposits; meta calcite and dolomite; secondary min in ig basalt and diabase
IG, META

H: 5-6
C: 2,2; prismatic
F: uneven, splintery
L: vitreous, silky
Cr Habits: elongated prismatic crystals; bladed groups; fibrous;
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Kaolinite

A

Al2Si2O5(OH)4

SF: friable habit and clay-like texture
Envi: secondary altering min in weathering; ig, sed, meta; near oxidized surface where altered form Al silicates like feldspars
IG, SED, META

H: 2-2.5
C: 1,1
F: earthy
L: dull
Cr Habits: most often as unshaped compact masses; tiny grains and plates; crystals rarely visible to naked eye
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Glauconite

A

(K,Na)(Fe+++,Al,Mg)2(Si,Al)4O10(OH)2

SF:
Envi:

H: 2
C: perfect
F: earthy
L: dull
Cr Habits: Micaceous - Platy texture with "flexible" plates
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Talc

A

Mg3Si4O10(OH)2

SF: soft, greasy feel
Envi: meta; serpentine deposits
META

H: 1
C: 1,1
F: uneven
L: greasy, waxy, pearly
Cr Habits: large distorted masses and foliated sheets and plates,  micaceous, radiating, botryoidal, and in fibrous masses
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Muscovite

A

KAl3Si3O10(OH)2

SF: flaky habit, crystals, sectility, and mode of occurence
Envi: ig; granite peg; meta; contact, schists, hydroT veins
IG, META

H: 2-2.5
C: 1,1
F: uneven
L: pearly; flaky, submetallic
Cr Habits: thick flakes, micaceous masses,  tabular, foliated, flaky, and scaly forms
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Biotite

A

K(Mg,Fe2+3)(Al,Fe3+)Si3O10(OH,F)2

SF: flaky habit, crystals, sectility, and mode of occurence
Envi: meta; schists and gneiss; ig; granites, rhyolites, primary mica in rare earth pegmatites
IG, META

H: 2.5-3
C: 1,1
F: uneven
L: pearly, submetallic
Cr Habits:  thick flakes, micaceous masses,  tabular, foliated, flaky, and scaly forms
17
Q

Lepidolite

A

K(Li,Al)3(Si,Al)4O10(F,OH)2

SF: flaky habit, crystals, color, sectility, and mode of occurence
Envi: ig; high-lithium granite pegmatites
IG

H: 2.5-3
C: 1,1
F: uneven
L: pearly
Cr Habits: small, scaly crystals in dense aggregates,  micaceous masses and groupings, and in tabular, foliated, flaky, and scaly forms
18
Q

Serpentine

A

Mg3Si2O5(OH)4
or X2-3Si2O5(OH)4

SF: greasy feel, soft, and may be flexible and elastic
Envi: rock forming mineral in metamorphic
META

H: 2-5
C: usually not discernible because of crystal development
F: conchoidal, splintery
L: greasy, waxy, or silky
Cr Habits: massive, platy, fibrous (forming tough, flexible and elastic fibers), botryoidal, columnar, earthy, platy, micaceous, in pyramidal groupings, in parallel bladed groups, and as fibrous veins

19
Q

Quartz

A

SiO2

SF: hardness, crystal forms, striations on crystal faces, and frequent appearance of conchoidal fractures on crystal faces
Envi: all mineral environments
IG, SED, META

H: 7
C: -
F: conchoidal
L: vitreous
Cr Habits:
20
Q

Orthoclase

A

KAlSi3O8

SF: crystal habits, cleavage, and hardness
Envi: low temp meta rocks; ig; peg, sed; conglomerates
IG, SED, META

H: 6
C: 2,1 - basal ; 2,1 - prismatic ; 3,1 - pinacoidal. The cleavage angle is about 90º
F: conchoidal to uneven
L: vitreous, pearly
Cr Habits: well shaped prismatic and tabular crystals, which are sometimes striated; penetration and repeated twins

21
Q

Microcline

A

KAlSi3O8

SF: crystal habits, cleavage, and hardness
Envi: ig; peg, meta; hydroT veins, sed; conglomerates
IG, SED, META

H: 6
C: 2,1 - basal ; 2,1 - prismatic ; 3,1 - pinacoidal. The cleavage angle is about 90º
F: conchoidal to uneven
L: vitreous
Cr Habits: well formed crystals, similar to orthoclase (twinning habits), grainy and in compact crystal aggregates

22
Q

Plagioclase

A

(Na,Ca)Al1-2Si3-2O8

SF: crystal habits, cleavage, and hardness
Envi: commonly clast produced during the weathering of ig and meta rocks
IG, SED, META

H: 6-6.5
C: 2,1 - basal ; 2,1 - prismatic ; 3,1 - pinacoidal. The cleavage angle is about 90º
F: conchoidal to uneven
L: vitreous; pearly on cleavages
Cr Habits: flat and bladed, compact groupings, tall prismatic and short, stubby, tabular crystals, grainy; striated often

23
Q

Nepheline

A

(Na,K)AlSiO4

SF: environment, greasy luster, and cleavage
Envi: alkaline igneous nepheline syenites and nepheline syenite pegmatites
IG

H: 5.5-6
C: 2,3
F: subconchoidal to uneven
L: vitreous to greasy
Cr Habits: good hexagonal shape, inter grown/stacked crystals, massive or grainy

Mineralogy (7 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions