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DAY 2: FINAL EXAM > NATIVE ELEMENTS > Flashcards

NATIVE ELEMENTS Flashcards

1
Q

Au

A

Gold

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2
Q

Isometric, with crystals commonly octahedral. Often in arborescent crystal groups. Crystals may
be irregularly shaped, passing into filliform, reticulated, and dendritic shapes.

A

Gold

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3
Q

What is the hardness of gold?

A

2.5 - 3

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4
Q

What is the specific gravity of gold?

A

19.3

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5
Q

What is the usual color of gold?

A

Various shades of yellow depending on the purity, becoming paler with increasing silver content.

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6
Q

The chief sources are (1) hydrothermal – quartz veins in which it is commonly so fine-grained that its presence cannot be detected with the eye, and (2) placer deposits, and their lithified equivalents known as conglomerates, in which it occurs as fine detrital grains and nuggets.

A

Gold

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7
Q

Ag

A

Silver

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8
Q

Silver has a hardness of ________.

A

2.5 - 3

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9
Q

What is the specific gravity of Silver?

A

10.5 when pure, 10 - 12 when impure

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10
Q

Isometric crystals are commonly malformed and in branching, arborescent, or reticulated groups.

A

Silver

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11
Q

In large deposits has been precipitated from primary hydrothermal solutions. It is also distributed, in smaller amounts, in the oxidized zones of ore deposits.

A

Silver

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12
Q

Cu

A

Copper

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13
Q

Isometric crystals with tetrahexahedral, cube, dodecahedral, and octahedral faces are common.
Crystals are usually malformed and in branching and arborescent groups.

A

Copper

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14
Q

What is the hardness of copper?

A

2.5 - 3

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15
Q

What is the specific gravity of native copper?

A

8.9

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16
Q

What is the usual color of copper?

A

red on fresh surface, usually dark with dull luster because of tarnish.

17
Q

Occur in the oxidized zones deposits associated with
cuprite, malachite, and azurite. Primary deposits are associated with basaltic lavas, where it was deposited through the reaction of hydrothermal solutions with iron oxide minerals.

A

Copper

18
Q

Orthorhombic crystals with pyramidal habit, commonly with two dipyramids, prism {011}, and a base in combination.

A

Sulfur

19
Q

T or F. Sulfur has a cleavage and fracture conchoidal to uneven.

A

F. only fracture conchoidal to uneven

20
Q

What is the usual color of sulfur?

A

Yellow, varying with impurities to yellow shades of green, gray, and red.

21
Q

Is found commonly at or near the crater rims of active or extinct volcanoes, deposited from
volcanic gases. It also occurs in veins with metallic sulfides formed by the oxidation of the
sulfides.

A

Sulfur

22
Q

C

A

Diamond and graphite

23
Q

Isometric crystals with octahedral form most common; cubes and dodecahedrons may occur as
well. Octahedral faces are frequently curved, and twins on {111} (spinel law) are common.

A

Diamond crystal form

24
Q

_____ a variety of diamond, has rounded forms and a rough exterior resulting from a radial or cryptocrystalline aggregate. The term is also applied to badly colored or flawed diamonds without
gem value.

A

Bort

25
Q

What is the cleavage of diamond?

A

Octahedral {111} perfect

26
Q

What is the hardness of diamond?

A

10

27
Q

What is the specific gravity of diamnond?

A

3.51

28
Q

What is the usual color of diamond?

A

Usually pale yellow or colorless; also pale shades of red, orange, blue, green, and brown. Deeper
shades are rare.

29
Q

_________ is a black or grayish-black bort. It is noncleavable, opaque, and less brittle than crystals.

A

Carbonado or carbon

30
Q

The primary occurrence of it is in altered peridotite called kimberlite, as intrusive bodies that are commonly circular with a pipelike shape.

A

Diamond

31
Q

Tabular crystals with hexagonal outline and a prominent basal face are quite common. Usually in foliated or scaly masses; also radiated or granular.

A

Graphite

32
Q

What is the cleavage of graphite?

A

Basal {0001} perfect.

33
Q

What is the hardness of graphite?

A

2.23

34
Q

What is the usual color of graphite?

A

Black, with black streak. Luster metallic, sometimes dull, earthy.

35
Q

Occurs commonly in metamorphic rocks such as crystalline limestones, schists, and
gneisses. It is also present in hydrothermal veins associated with quartz, orthoclase, tourmaline,
apatite, pyrite, and titanite.

A

Graphite

DAY 2: FINAL EXAM (13 decks)

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