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DAY 2: FINAL EXAM > OXIDES > Flashcards

OXIDES Flashcards

1
Q

Cu2O

A

Cuprite

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2
Q

Commonly in isometric crystals that show cube, octahedron, and dodecahedron and combinations thereof.

A

Cuprite crystal form

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3
Q

What is the hardness of cuprite?

A

3 1/2 -4

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4
Q

What is the specific gravity of cuprite?

A

6.1

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5
Q

What is the color of cuprite?

A

Various shades of red; ruby red in transparent crystals, called “ruby copper.”

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6
Q

Found, as a supergene mineral, in the oxidized portions of copper deposits, associated with limonite and secondary copper minerals such as native copper, malachite, azurite, and chrysocolla.

A

Cuprite

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7
Q

Al2O3

A

Corundum

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8
Q

Prismatic or tabular hexagonal crystals are common. May display hexagonal dipyramids that are rounded into barrel shapes with deep horizontal striations.

A

Crystal form of corundum

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9
Q

What is the cleavage of corundum?

A

Only parting on {0001} and {10\bar1 1}

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10
Q

Hardness of corundum?

A

9

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11
Q

What is the specific gravity of corundum?

A

4.02

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12
Q

What is the usual color of corundum

A

Usually some shade of brown, pink, or blue; but may be colorless or any color.

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13
Q

Red gem corundum

A

ruby

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14
Q

Gem corundum of any other color

A

sapphire

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15
Q

Black granular corundum intimately mixed with magnetite and hematite.

A

emery

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16
Q

A common accessory mineral in some metamorphic rocks, such as crystalline limestone, mica schist, or gneiss. Also present in SiO2– poor igneous rocks such as syenites and nepheline syenites.

A

corundum

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17
Q

Fe2O3

A

Hematite

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18
Q

If in crystals, they are usually thick- to thin tabular on {0001} with hexagonal outline. Thin plates may be grouped in rosettes.

A

crystal form of hematite

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19
Q

May also be micaceous and foliated and referred to as ______ hematite

A

specular

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20
Q

What is the cleavage of hematite?

A

Parting on { 10bar1 1} and {0001}

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21
Q

What is the hardness of hematite?

A

5 1/2 - 6 1/2

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22
Q

What is the specific gravity of hematite?

A

5.26 (for crystals)

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23
Q

What is the usual color of hematite?

A

Reddish brown to black

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24
Q

Red earthy variety of hematite?

A

red ocher

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25
Q

Platy and metallic variety of hematite?

A

specularite

26
Q

An accessory constituent of many rock types and the most abundant iron ore mineral in Precambrian banded iron-formations. It may occur as a sublimation product in volcanic rocks and as an accessory constituent in granites.

A

occurence of hematite

27
Q

FeTiO3

A

ilmenite

28
Q

Most commonly massive and compact. Also in grains or as sand.

A

crystal form of ilmenite

29
Q

What is the hardness of ilmenite?

A

5 1/2 - 6

30
Q

What is the specific gravity of ilmenite?

A

4.7

31
Q

What is the color of ilmenite?

A

Iron black with metallic to submetallic luster.

32
Q

A common accessory in igneous rocks. May occur as large masses in gabbros, diorites, and anorthosites, commonly associated with magnetite.

A

occurrence of ilmenite

33
Q

TiO2

A

Rutile

34
Q

Commonly in tetragonal, prismatic crystals with dipyramid terminations and vertically striated prism faces.

A

crystal form of rutile

35
Q

What is the cleavage of rutile?

A

Prismatic {110} distinct

36
Q

What is the hardness of rutile?

A

6-6 1/2

37
Q

What is the specific gravity of rutile?

A

4.18-4.25

38
Q

What is the color of rutile?

A

Red, reddish brown to black. Streak pale brown.

39
Q

Found in granite, granite pegmatite, mica schist, gneiss, metamorphic limestone, and dolomite. May be included in quartz and micas as fine-grained slender crystals.

A

occurrence of rutile

40
Q

MnO2

A

pyrolusite

41
Q

Usually in radiating fibers or columns. Also granular massive; often in reniform coats and dendritic shapes finely overgrown with other Mn-oxides and hydroxides.

A

crystal form of pyrolusite

42
Q

What is the cleavage of pyrolusite?

A

Prismatic {110} perfect; fracture splintery.

43
Q

What is the hardness of pyrolusite?

A

1– 2 (often soils the fingers)

44
Q

What is the hardness for coarsely crystalline polianite?

A

6 –6 1/2

45
Q

What is the specific gravity of pyrolusite?

A

4.75

46
Q

What is the usual color of pyrolusite?

A

Iron black. Streak also iron black.

47
Q

It is the most common manganese ore mineral and is widespread in its occurrence. It is found as nodular deposits in bogs, on lake bottoms, and on the floors of oceans.

A

pyrolusite

48
Q

SnO2

A

Cassiterite

49
Q

When in crystals may show two tetragonal prisms and dipyramids. Often in elbow -shaped twins.

A

crystal form of cassiterite

50
Q

What is the cleavage of cassiterite?

A

Prismatic {010} imperfect

51
Q

What is the hardness of cassiterite?

A

6-7

52
Q

What is the specific gravity of cassiterite?

A

6.8-7.1

53
Q

What is the usual color of cassiterite?

A

Usually brown or black; rarely yellow or white. Streak white.

54
Q

Present as an accessory mineral of igneous rocks and pegmatites, but most commonly found in high-temperature hydrothermal veins in or near granitic rocks. Vein associations may include tourmaline, topaz, fluorite, apatite, molybdenite, and arsenopyrite

A

occurrence of cassiterite

55
Q

Cassiterite may also occur as rolled pebbles in placer deposits, know as __________.

A

stream tin

56
Q

Cassiterite may also have reniform shapes with radiating fibrous appearance, known as

A

wood tin

57
Q

UO2

A

Uraninite

58
Q

Most commonly as massive or botryoidal forms with a banded structure, known as ______.

A

crystal form of uraninite; pitchblende

59
Q

What is the hardness of uraninite?

A

5 1/2

60
Q

What is the specific gravity of uraninite?

A

6.5 – 9, for pitchblende. Crystals show G 7.5 – 9.7.

61
Q

What is the color of uraninite?

A

Black. Streak brownish black.

62
Q

A primary constituent of granitic rocks and pegmatites, and in high-temperature hydrothermal veins associated with cassiterite, chalcopyrite, and arsenopyrite.

A

uraninite

DAY 2: FINAL EXAM (13 decks)

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