Mineralogy > MINERAL MIDTERM > Flashcards

MINERAL MIDTERM Flashcards

(46 cards)

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1
Q
A
  • Pyrite
  • FeS2
  • Streak is greenish-black
  • Conchoidal fracture
  • Hardness 6-6.5
  • SG is approx 5.1 (heavier than most emtallic minerals)
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2
Q
A
  • Marcasite
  • FeS2
  • Streak is greenish to brownish-black
  • Sometimes a faintly decectable sulfur smell
  • Color is brassy yellow with a greenish tint
  • multi-color tarnish may be present
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3
Q

Pyrrohotite

A
  • Fe(1-x)S (x=0 to 0.2)
  • Color is bronze
  • Luster is metallic
  • Hardness is 3.5 - 4.5
  • Streak is grey-black
  • Weakly magnetic
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4
Q

Covellite

A
  • Covellite
  • CuS
  • Color is deep metallic indigo blue (tarnished purple-black) w/ irridescent flashes of yellow and red
  • Cleavage is perfect in one direction forming thin, flexible sheets
  • Fracture is flaky
  • Hardness is 1.5 - 2
  • SG is 4.6 - 4.8
  • Streak is grey to black
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5
Q

Chalcocite

A
  • Cu2S
  • Chalcocite
  • Color is dark grey to black
  • Xtals are usually deeply grooved/striated
  • Cleavage is perfect in 2 directions, prismatically
  • Fracture is conchoidal
  • Hardness is 2.5 - 3
  • Streak is shiny black to grey
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6
Q
A
  • Chalcopyrite
  • CuFeS2
  • Color is brassy yellow, tarnishes to irridescent blues, greens, yellows, and purples
  • Cleavage is rather poor in 1 direction
  • Hardness is 3.5 - 4
  • Streak is dark green
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7
Q
A
  • Bornite
  • Cu5FeS4
  • Color is brown to black with a typical purplish-bluish tarnish, a reddish bronze color on freshly broken surfaces
  • Cleavage is very poor
  • Fracture is conchoidal
  • Hardness is 3
  • Streak is grey-black
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8
Q
A
  • Sphalerite
  • (Zn, Fe)S
  • Color is typically black but can be brown, yellow, reddish, green, and less commonly white or colorless
  • Luster is adamantine or resinous or submetallic to earthy
  • Cleavage is perfect in 6 directions forming dodecahedrons
  • Fracture is conchoidal but rarely seen
  • Hardness 3.5 - 4
  • Streak is yellow to light brown
  • triboluminescence
  • Pyroelectric
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9
Q
A
  • Galena
  • PbS
  • Color is lead to silver grey sometimes with a bluish tint
  • Habits include cubes, octahedron, and combos
  • Cleavage is perfect in 4 directions
  • Fracture is uneven
  • Hardness 2.5+
  • SG is 7.5+ (especially heavy)
  • Streak is lead grey
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10
Q
A
  • Cinnabar
  • HgS
  • Color is bright scarlet or cinnamon red to a brick red
  • Luster is adamantine to submetallic
  • Hardness is 2 - 2.5
  • SG is 8.1+ (especially heavy for non-metallic mineral)
  • Habits are rarely individual xtal, commonly crusts and massive
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11
Q
A
  • Realgar
  • As4S4
  • Color is orange to red
  • Luster is resinous, adamantine, to submetallic
  • Cleavage is good in 1 direction
  • Hardness is 1.5 - 2
  • Streak is orange-yellow
  • Unstable in light
  • Almost always inclue orpiment
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12
Q
A
  • Orpiment
  • As2S3
  • Color is orange-yellow to yellow
  • Hardness is 1.5 - 2
  • Streak is yellow
  • Unstable in light
  • Distinct odor similar to sulfur but due to the aresenic
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13
Q
A
  • Stibnite
  • Sb2S3
  • Color is steel grey to silver
  • Luster is metallic
  • Cleavage is perfect in lengthwise direction
  • Streak is dark grey
  • Striated lengthwise
  • Slightly flexible xtals
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14
Q
A
  • Molybdenite
  • MoS2
  • Color is silver metallic with a bluish cast
  • Luster is metallic
  • Cleavage is perfect in 1 direction, forming sheets
  • Fracture is flaky
  • Hardness is 1.5 - 2
  • Streak is bluish grey
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15
Q
A
  • Arsenopyrite
  • FeAsS
  • Color is brassy white to grey
  • Luster is metallic
  • Hardness is 5.5 - 6
  • SG is approx 6.1 (slightly heavier than usual)
  • Bitter smell when powdered or broken
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16
Q
A
  • Tetrahedrite
  • (Cu, Fe)12Sb4S13
  • Color is black to steel grey to silver
  • Luster is metallic
  • No cleavage
  • Fracture is conchoidal
  • Hardness is 3 - 4+
  • Tarnishes to greenish shade
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17
Q
A
  • Kernite
  • Na2B4O6(OH)2 3H2O
  • Color is colorless to white
  • Luster is vitreous to pearly
  • Cleavage is perfect in 2 directions
  • Fracture is splintery due to cleavage
  • SG is 1.9 (very low density)
  • Streak is white
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18
Q
A
  • Borax
  • Na2[B4O5(OH)4] 8H2O
  • Color is white
  • Luster is dull/earthy
  • Cleavage is perfect in 1 direction
  • Fracture is conchoidal
  • Hardness is 2 - 2.5
  • SG is 1.7 (very light density)
  • Streak is white
  • Sweet alkaline taste
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19
Q
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A
  • Gold
  • Au
  • Streak is golden yellow
  • SG is 19.3+ (very heavy)
  • Ductile, sectile, and malleable
  • Native element
20
Q
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A
  • Silver
  • Ag
  • Streak is silver white
  • Hardness is 2.5 - 3
  • Ductile, sectile, malleable
  • Native element
21
Q
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A
  • Copper
  • Cu
  • Native element
  • Streak is reddish copper
  • Ductile, sectile, malleable
22
Q
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A
  • Sulfur
  • S
  • Native element
  • Cleavage is poor in 2 directions
  • Odor
  • Poor heat conductivity
  • Massive or powdery habits
23
Q
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A
  • Diamond
  • C
  • Native element
  • Color is variable, tends toward pale yellow and brown
  • Luster is adamantine to waxy
  • Hardness is 10
  • Cleavage is perfect in 4 directions
  • Streak is white
24
Q
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A
  • Graphite
  • C
  • Native element
  • Habit includes massve lamellar veins and earthy masses
  • Cleavage is perfect in 1 direction
  • Thin flakes are flexible but inelastic
25
* Halite * Habit is predominantly cubes * Cleavage is perfect in 3 directions forming cubes * Fracture is conchoidal * SG is 2.1 (light) * Hardness is 2 * Salty taste
26
* Sylvite * Cleavage is good in 3 directions * Hardness is 2 - 2.5 * SG is 3.9 - 4.1 (heavier than average for translucent) * Dissolves easily in water * Bitter taste * Does not powder easily
27
* Fluorite * Cleavage is eprfect in 4 directions forming octahedrons * Fracture is irregular and brittle * Hardness is 4 * Often fluoresces * Color zoning
28
* Corundum * Al2O3 * Luster adamantine to vitreous * All colors * Parting occurs in 3 directions * Hardness 9 * Streak is white * EXTREME hardness
29
* Fe2O3 * Color is metallic grey, dull to bright red * Parting in 2 directions * Hardness is 5 - 6 * SG is 5.3 (slightly above) * Streak is red\*\*\*\*\*\*
30
* Ilmenite * FeTiO3 * Color is iron black, grey w/brownish tint * Hardness is 5 - 6 * Streak is black * No cleavage
31
* Spinel * All colors * Luster is vitreous * No Cleavage * Conchoidal fracture * Hardness is 7.5 - 8 * SG is 3.6 - 4 * Streak is white
32
* Magnetite * Color is black, grey w/brownish tint * Streak is black * Magnetism * Hardness is 5.5 - 6.5 * Lodestone is permenently magnetized
33
* Chromite * Color is black to brownish black * No cleavage * Hardness is 5.5 * Streak is grey * Weakly magnetic
34
* Rutile * Good cleavage in 2 directions * Hardness is 6 - 6.5 * SG is 4.2 (slightly heavy) * Streak is bright to dark red * Sprarkles higher than diamond
35
* Pyrolusite * Color is darkish, black to lighter grey, sometimes bluish * Cleavage is good in 2 directions forming prisms, rarely seen * Streak is bluish-black * Hardness 2 - 6 (xtal)
36
* Cuprite * Color is dark red to almost black * Luster is adamantine, submetallic, earthy * Cleavage is fair in 4 directions forming octahedrons * Hardness is 3.5 - 4 * Streak is shiny metallic brownish-red
37
* Gibbsite * Color is bluish, greenish-white, grey-white * Luster is vitreous - pearly * Hardness is 2.5 - 3.5 * Streak is white * Clay-smell\*\*\*\*\*
38
* Goethite * Color is yellowish to reddish to dark brown * Luster is adamantine to dull * Cleavage is perfect in 1 direction * Uneven + splintery fracture * Hardness is 5 * Streak is brownish, brownish-yellow to orange-yellow
39
* Limonite * Various shades of brown + yellow * Luster is earthy * massive, layered, botryoidal, and stalactitic * Fractureis crumbly to earthy * Hardness is 4 * Streak is yellowish-brown * LACKS xtals forms
40
* Calcite * Colorless/white, grey, yellow, green * Luster is vitreous * Habit is extremely variable * Hardness is 3 * Streak is white * Refractive properties...optical
41
* Aragonite * White, red, yellow, orange, green, blue, + brown * Luster is dull to vitreous * Hardness is 3.5 - 4 * Streak is white * SG is slightly heavier than calcite * Effervesces in cold HCl
42
* Siderite * Pale, yellow-tannish, grey, brown, red, black, and colorless * Luster is vitreous * Cleavage is perfect in 3 directions * SG is 3.9 (relatively heavy) * Streak is white * Magnetic when heated
43
* Rhodochrosite * Pink, rose-red, cherry-red, yellow-grey * Luster is vitreous to pearly * Streak is white
44
* Dolomite * Color is white, grey, pink * Luster is vitreous to pearly * Habit... saddle-shaped rhombohedral twins, also slightly curved faces * Hardness is 3.5 * Streak is white * Effervesces weakly w/ warm HCl after powdered
45
* Malachite * Bright green, dark green * Luster is dull to vitreous * Botryoidal, stalactitic , globular * Fracture is conchoidal to splintery * Streak is light green
46
* Azurite * Azure-blue * Luster is dull to viitreous * Streak is light blue
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