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Rock and Minera l

Rock and Minera l. Review.

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Rock and Minera l

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  1. Rock and Mineral Review

  2. Cleavage and Fracture are minerals properties that describe the way a mineral breaks when stressed. Cleavage describes the way a mineral breaks along its plane of weakness. These planes of weakness can be described as where the atomic bonding between atoms in the crystal structure is weak at those points causing the mineral break when stressed much like a stack of papers when drop will spread off in individual sheets. Cleavage

  3. Fracture Fracture is a mineral property where the atomic bonding between atoms in the crystal structure is perfect with no weakness. When these minerals are stressed they shatter making no two pieces truly the same.

  4. Moh’s Hardness Scale

  5. Galena Cleavage = Cubic Hardness = 2 – 2.5 Solubility = None Streak = Gray Magnetism= None Luster = Metallic Color = Silver Gray/Black Other Characteristics = Has same chemical formula as Pyrite, Heavy for its size (Dense), Ore of Lead, Brittle.

  6. Magnetite Cleavage = None Hardness = 5.5-6.5 Solubility = None Streak = Black Magnetism= YES! Luster = nonmetallic Color = Black to Gray Other Characteristics = Fe3O4, Ore of Iron.

  7. Quartz Cleavage = None Hardness = 7 Solubility = HCL Streak = White Magnetism= None Luster = Vitreous Color = Colorless/White Other Characteristics = Melted to help clocks keep time

  8. Sulfur Cleavage = None Hardness = 2 Solubility = None Streak = Yellow Magnetism= None Luster = Dull Color = Yellow Other Characteristics = Smells like rotten eggs, Melts easily.

  9. Graphite Cleavage = Perfect basal Hardness = 1 – 2 Solubility = None Streak= Gray to Black Magnetism= None Luster = Sub metallic Color = Gray to Black Other Characteristics = Used in pencils (Not lead), Feels greasy.

  10. Feldspar Cleavage = 2 directions Fracture = Uneven Hardness = 6 Solubility = None Streak = White Magnetism= None Luster = Pearly Color = Pink/White Other Characteristics = The pink hue is granite.

  11. Talc Cleavage = One Direction Fracture = Uneven Hardness = 1 Solubility = None Streak= White Magnetism= None Luster = Pearly/Greasy Color = White to Green Other Characteristics = Feels soapy, Used to make talcum powder, easy to sculpt.

  12. Pyrite Cleavage = None Hardness = 6 – 6.5 Solubility = None Streak= Greenish Black Magnetism= None Luster = Metallic Color = Brassy Yellow Other Characteristics = AKA Fools Gold, Ore of Sulfur.

  13. Gypsum Cleavage = One Direction Hardness = 2 Solubility = None Streak= White Magnetism= None Luster = Vitreous to Pearly Color = White to Colorless Other Characteristics = Used to make drywall.

  14. Hematite Cleavage = None Hardness = 5 – 6 Solubility = None Streak = Blood Red to Brown Red Magnetism= None Luster = Sub metallic Color = Steel to Silver Gray Other Characteristics = Ore of Iron, Used to make Steel.

  15. Calcite Cleavage = 3 Directions Hardness = 3 Solubility = Bubbles CO2 Streak= White Magnetism= None Luster = Vitreous Color = Variable Colorless to White Other Characteristics = Used for making cement.

  16. Granite Fracture/Cleavage = Irregular Hardness = 5 – 7 Solubility = None Streak = Colorless to White* Magnetism= None Luster = Dull Color = Varies Other Characteristics = Intrusive Igneous Rock.

  17. Mica Cleavage = One Plane Hardness = 2 – 3 Solubility = None Streak = Gray Magnetism= None Luster = Vitreous Color = White, Gray, Silver white, Brownish white, Greenish white Other Characteristics = Electrical insulator.

  18. Corundum Cleavage = None Hardness = 9 Solubility = None Streak = None - White Magnetism= None Luster = Vitreous Color = Variable Other Characteristics = Scratch anything, but diamonds, Rubys, Blue equals Sapphire, Insoluble.

  19. Limestone Cleavage = One Hardness = 3 Solubility = Yes Streak = None Magnetism= None Luster = Dull Color = Light Other Characteristics = “Chemical” Sedimentary.

  20. Marble Fracture Hardness = 3 Solubility = Yes Streak= None Magnetism= None Luster = Pearly Color = Light Other Characteristics = Metamorphic, Parent rock is Limestone or Dolostone

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