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Corel Day 2 > native elements > Flashcards

native elements Flashcards

1
Q

gold crystal form

A
  • isometric, octahedral crystals
  • arborescent
  • irregular, filliform, reticulated, dendritic
  • irregular plates scales or masses
  • rounded or flattened grains “nuggets”
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2
Q

gold cleavage

A

none. hackly fracture

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3
Q

gold hardness

A

2.5 to 3. malleable sectile

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4
Q

gold specific gravity

A

19.3 pure
15 impure with other metals

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5
Q

gold color

A

shades of yellow, paler with silver, metallic opaque

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6
Q

gold occurrence

A
  1. hydrothermal quartz veins (vv fine grained)
  2. placer deposits, conglomerates, detrital grains “nuggets”
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7
Q

gold remarks

A
  • color, malleability and sectility
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8
Q

gold vs pyrite

gold vs chalcopyrite

A

pyrite is harder

chalcopyrite is brittle

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9
Q

silver crystal form

A
  • isometric, malformed
  • branching aborescent, reticulated groups
  • in coarse or fine wire
  • irregular masses, plates and scales
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10
Q

silver cleavage

A

none. hackly fracture

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11
Q

silver hardness

A

2.5 to 3. malleable and ductile

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12
Q

silver specific gravity

A

10.5 pure
10-12 impure

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13
Q

silver color

A

metallic opaque. silver white, tarnished brown to gray black

streak silver white

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14
Q

silver occurrence

A

large deposits from hydrothermal solution precipitates

in smaller amounts oxidized portions of ore deposits

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15
Q

silver remarks

A
  • color, malleability and specific gravity
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16
Q

copper crystal form

A
  • isometric, tetrahexahedral, cube, dodecahedral, octahedral, malformed branching and aborescent
  • irregular masses plates and scales
  • twisted and wirelike
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17
Q

copper cleavage

A

none. hackly fracture

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18
Q

copper hardness

A

2.5 to 3. ductile and malleable

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19
Q

copper specific gravity

A

8.9

20
Q

copper color

A

dull luster, copper red, tarnish to dark

21
Q

copper occurrence

A
  • primary deposits associated with basaltic lavas, the copper is deposited through reaction of hydrothermal fluids with iron oxide minerals
  • smaller amounts in oxidized zones of copper deposits associated with malachite azurite and cuprite
22
Q

copper remarks

A
  • copper red, malleability, high specific gravity hackly
23
Q

sulfur crystal form

A
  • orthorhombic, pyramidal, 2 dipyramids
  • prism 011 and base
  • masses perfectly crystallized
  • massive reniform stalactitic incrustations
24
Q

sulfur cleavage

A

none. conchoidal fracture to uneven. brittle

25
Q

sulfur hardness

A

1.5 to 2.5

26
Q

sulfur specific gravity

A

2.05 to 2.09

27
Q

sulfur color

A

resinous. transparent to translucent. sulfur yellow. impure shades of green gray red

28
Q

sulfur occurrence

A
  • crater rims of extinct volcanoes as gas deposits
  • veins with metallic sulfides from oxidation of sulfides
  • in tertiary sedimentary rocks assoc. with anhydrite gypsum and limestone
  • assoc with celestite, gypsum calcite and aragonite
29
Q

sulfur remarks

A
  • poor heat conductor
  • cracks bc hear from hand expands the outside layers
  • yellow color
30
Q

diamond crystal form

A
  • isometric, octahedral, cubes and dodecahedrons
  • octahedral often has curved faces
  • twins on 111
31
Q

variety of diamond that has a rounded form and rough exterior resulting from radial or cryptocrystalline aggregate

A

bort

32
Q

applies to badly colored or flawed diamonds without gem value

A

bort

33
Q

diamond cleavage

A

octahedral 111 perfect

34
Q

diamond hardness

A

10

35
Q

diamond specific gravity

A

3.51

36
Q

diamond color

A

adamantine. uncut greasy. colorless pale yellow. shades of red orange green blue brown.

deeper shades are rare

noncleavable, opaque, less brittle than crystals???

37
Q

a black or grayish black bort

A

carbonado / carbon

38
Q

diamond occurrence

A
  • primary: in kimberlites as intrusive bodies, commonly circular with pipelike shape aka diamond pipes
  • also in alluvial deposits (placers), bc of their inert nature, great hardness and high specific gravity
39
Q

diamond remarks

A
  • great hardness, adamantine, cleavage
40
Q

graphite crystal form

A
  • tabular crystals with hexagonal outline
  • prominent basal face
  • foliated or scaly masses
  • radiated or granular
41
Q

graphite cleavage

A

basal perfect 0001. flexible folia, not elastic

42
Q

graphite hardness

A

1-2

43
Q

graphite specific gravity

A

2.23

44
Q

graphite color

A

metallic sometimes greasy. black black streak

45
Q

graphite occurrence

A
  • in metamorphic rocks: crystalline limestone, schists and gneiss
  • hydrothermal veins associated with quartz, orthoclase, tourmaline, apatite, pyrite and titanite
  • also original constituent in some igneous rocks
46
Q

graphite remarks

A
  • black, foliated, extreme softness, greasy
47
Q

molybdenite vs graphite

A

moly has blue tone graphite is black

Corel Day 2 (17 decks)

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