Geology 1040- Mineral Physical Properties

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Apatite

Luster: non-metallic(vitreous to greasy luster)
Color: green to yellowish green
Hardness: 5
Density: 3.2
Fracture: conchoidal
Streak: white
Crystals

Augite

Luster: non-metallic(vitreous to dull luster)
Color: dark green to black
Hardness: 5.5-6
Density-3.4
Cleavage-2 planes near 90 degrees
Streak: greenish white

Biotite

Luster: non-metallic(vitreous to pearly luster)
Color: black to brown
Hardness: 2.5
Density: 3.4
Cleavage: basal
Streak: white to gray

Calcite

Luster: non-metallic(vitreous luster)
Color: variable color(usually colorless to white)
Hardness: 3
Density: 2.7
Cleavage: rhombohedral cleavage
Double refraction if clear crystal
Frizzes in Hcl
Streak: white

Chalcopyrite

Luster: metallic
Color: brassy yellow
Hardness: 3.5-4
Density: 4.2
Fracture: uneven to conchoidal
Streak: greenish black

Fluorite

Luster: non-metallic(vitreous luster)
Color: variable color(clear to purple, green to yellow)
Hardness: 4
Density: 3.1
Cleavage: octahedral cleavage
Streak: white

Galena

Luster: bright metallic
Color: lead to silver gray
Hardness: 2.5
Density: 7.5
Cleavage: cubic
Streak: lead gray

Garnet

Luster: non-metallic(vitreous)
Color: reddish brown color
Hardness: 7-7.5
Density: 4.3
Fracture: conchoidal
Dodecahedron crystals

Graphite

Luster: metallic to dull waxy
Color: gray to black color
Hardness: 1-2
Density: 2.2
Fracture: uneven
Streak: black
Greasy feel
Smudges fingers

Gypsum

Luster: non-metallic(vitreous luster)
Color: variable color(usually clear to white)
Hardness: 2
Density: 2.3
Massive(alabaster)
Fibrous(satin spar)
Streak: white
2nd One
Cleavage: 3 plans cleavage(good in one direction)
Streak: white

Halite

Luster: non-metallic(vitreous luster)
Color: variable(usually clear to gray)
Hardness: 2.5
Density: 2.1
Cleavage: cubic
Streak: white

Hematite

Luster: non-metallic(dull earthy luster)
Color: brownish red
Hardness: 5-6
Density:5.3
Fracture: uneven
Streak: red
2nd One
Luster: shiny metallic
Color: silver gray
Hardness: 5-6
Density: 5.3
Fracture: uneven
Flaky
Streak: brownish red

Hornblende

Luster: non-metallic(vitreous to dull luster)
Color: dark green to black
Hardness: 5.5-6
Density: 3.4
Cleavage: 2 planes at 56 degrees/125 degrees
Streak: gray to brown

Kaolinite

Luster: non-metallic(earthy luster)
Color: usually white
Hardness: 1.5-2
Density: 2.6
Massive variety
Fracture: earthy
Streak: white
earthy odor when moist

Magnetite

Luster: dull to metallic
Color: black color
Hardness: 5.5-6.5
Density:5.1
Fracture: rough to conchoidal
Streak: black
May be magnetic

Muscovite

Luster: non-metallic(vitreous to pearly luster
Color: clear to silver or light brown
Hardness: 2.5
Density: 2.8
Cleavage: basal
Streak: white
Forms sheets

Olivine

Luster: non-metallic(vitreous luster
Color: dark green, greenish-brown to black(fayalite)
Hardness: 6.5-7
Density: 3.2-4.3
Fracture: conchoidal
Common in granular masses
Streak: white

Orthoclase

Luster: non-metallic(vitreous luster)
Color: white to orange or brown
Hardness:6
Density: 2.6
Cleavage: 2 planes nearly 90 degrees
Muscle fiber appearance
Streak: white

Plagioclase

Luster: non-metallic(vitreous luster)
Color: white to gray
Hardness: 6
Density: 2.6
Cleavage: 2 planes nearly 90 degrees
Striations are diagnostic
Streak: white

Pyrite

Luster: shiny metallic luster
Color: brassy yellow color
Hardness: 6-6.5
Density: 5.1
Fracture: rough to conchoidal
Streak: greenish black
Crystal habit may be cube, octahedron or pyritohedron

Quartz

Luster: non-metallic(vitreous luster)
Color: variable color(clear to pink or purple)
Hardness: 7
Density: 2.65
Crystals common
Fracture: conchoidal
Streak: white
2nd One
Luster: non-metallic(vitreous luster)
Color: variable color(gray, brown, black)
Hardness: 7
Density: 2.65
Crystals common
Fracture: conchoidal
Streak: white

Sphalerite

Luster: non-metallic(adamantine to resinous luster)
Color: yellowish brown to black
Hardness: 3.5
Density: 4
Cleavage: dodecahedral
Streak: yellow

Talc

Luster: non-metallic(pearly luster)
Color: light green, gray or white color
Hardness: 1
Density: 2.7
Cleavage: none
Massive
Streak: white
Soapy feel

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