Lab Exam 1: Intro to Earth Science: Minerals

Cleavage:NoneColor:Grayish black, Iron black
Hardness:5.5-6 - Knife Blade
Luster:MetallicMagnetism:Naturally strong Streak:black

Usesuses include: gemstone, sand paper.Colorwine red to reddish brown, yellow, green, blackStreakcolorlessLustervitreousDiaphaneitytransparent to translucentCleavagenoneHardness6.5 - 8

Uses uses include: table salt, tanning.Colorcolorless or white, (yellow, red, blue, purple, orange if impure)StreakwhiteLustervitreousDiaphaneitytransparent to translucentCleavageperfect, cubicHardness2.5
Distinguishing
Characteristicstaste, cleavageCrystal Systemisometric

Colorlead grayStreaklead grayLustermetallicDiaphaneityopaqueCleavageperfect, cubicHardness2.5Specific Gravity7.4 - 7.6Distinguishing
Characteristicscolor, luster, specific gravity, streakCrystal SystemisometricChemical Classificationsulfide

Colorclear, colorless, white, gray, yellow, red, brownStreakwhiteLustervitreousDiaphaneitytransparent to translucentCleavageperfectHardness2Specific Gravity2.3Distinguishing
Characteristicscleavage, specific gravity, low hardnessCrystal SystemmonoclinicChemical Classificationsulfate

Colorolive to yellowish greenStreakcolorlessLustervitreousDiaphaneitytransparent to translucentCleavagenoneHardness6.5 - 7Specific Gravity3.2 - 4.4Distinguishing
Characteristicsglassy luster, colorCrystal Systemorthorhombic

Colorusually white but also colorless, gray, red, green, blue, yellow, brown, orangeStreakwhiteLustervitreousDiaphaneitytransparent to translucentCleavagerhombohedral, perfectHardness3Specific Gravity2.7Distinguishing Characteristicshardness of 3; perfect cleavage in three directions at rhombohedral angles; effervesces in contact with cold, dilute HClCrystal Systemhexagonal

Cleavage:{001} Good, {010} Good Color:White, Gray, Bluish white, Reddish white, Greenish white.Diaphaneity:Transparent to translucent Fracture:Brittle - Generally displayed by glasses and most non-metallic minerals.
Hardness:6-6.5 - Orthoclase-Pyrite

Luster:Vitreous (Glassy) Streak:white

Usesuses include: decoration, dimension stone.Colordark green to blackStreakgray to greenish grayLustervitreousDiaphaneitytranslucent to nearly opaqueCleavagegoodHardness5.0 - 6.0

Colorblack, dark green, dark brownStreakwhite to grayLustervitreousDiaphaneitytransparent to translucentCleavagebasal, perfectHardness2.5 - 3Specific Gravity2.7 - 3.3Distinguishing
Characteristicsdark color, perfect cleavageCrystal SystemmonoclinicChemical Classificationsilicate

Colorpale brass yellowStreakgreenish black to brownish blackLustermetallicDiaphaneityopaqueCleavageindistinctHardness6 - 6.5Specific Gravity4.9 - 5.2Distinguishing
Characteristicscolor, hardness, fool's goldCrystal SystemisometricChemical ClassificationsulfideChemical Compositioniron sulfide, FeS ₂

Coloroccurs in virtually every color. Common colors are clear, white, gray, purple, yellow, brown, black, pink, green, red.StreakColorless (harder than the streak plate)LusterVitreous.DiaphaneityTransparent to translucent.CleavageNone - typically breaks with a conchoidal fracture.Hardness7Specific Gravity2.6 - 2.7Distinguishing CharacteristicsConchoidal fracture, glassy luster, hardness.Crystal SystemHexagonal

Colorgreen, white, gray, brown, colorlessStreakwhite to pale greenLusterpearlyDiaphaneitytranslucentCleavageperfectHardness1Specific Gravity2.7 to 2.8Distinguishing Characteristicsfeel, color, softness, cleavageCrystal Systemmonoclinic

Usesuses include: ore of iron, pigment.Colorsteel gray to black, reddish brown to blackStreakred to reddish brownLustermetallic, dullDiaphaneityopaqueCleavagenoneHardness5.0 - 6.0Specific Gravity5.26Distinguishing
CharacteristicsstreakCrystal Systemhexagonal

Usesuses include: flux, drinking water, ornamental stone.Colorcolorless, green, blue, purple, yellow, red, blackStreakwhiteLustervitreousDiaphaneitytransparent to translucentCleavageperfect, octahedralHardness4Specific Gravity3.2Distinguishing
Characteristicscleavage, hardness, lusterCrystal Systemisometric