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Gypsum (all of the types)

Page history last edited by Orion 10 years, 4 months ago

Gypsum

All varieties:

Density: 2.3

Streak: White

Hardness: 2

crystal structure: monoclinic

formula: CaSO4·2H2O

rocks mineral is found with: found in lake mud, clay beds, evaporated seas; found with these minerals: copper ores, sulfur and sulfides, silver, iron ores, coal, calcite, dolomite, limestone, and opal

mineral group:  Sulfate mineral  

Special properties:

  • has natural thermal insulating properties, warm to touch 
  • can be fluorescent

 

 

Alabaster:  

  • Color:  white or colorless
  • Luster: Vitreous
  • *** Habit: Granular / massive form of gypsum
  • cleavage: perfect
  • luster: Vitreous  
  • Uses: ornamental stone and for carvings/sculpture, plaster of paris 
  • Tenacity: Flexible
  • Diaphaneity: Transparent
  • Fracture: granular

 

 

 

 

 

Satin spar: 

 

  • density: 2.3
  • Color: clear/white 
  • ***Luster: silky
  • streak: white  
  • crystal structure: monoclinic 
  • cleavage: perfect
  • Uses: drywall and ceilings, plaster of paris, fertilizer and soil conditioner

 

 

Selenite:  

  • Density: 2.3
  • Color:  Colourless, often tinged other hues due to impurities
  • streak: White
  • ***luster: Vitreous 
  • crystal structure: monoclinic 
  • cleavage: perfect
  • Uses: drywall and ceilings, plaster of paris, fertilizer and soil conditioner
  • formula: CaSO4·2H2O
  • Tenacity: Flexible
  • Diaphaneity: Transparent
  • Fracture: Fibrous

 

 

 

 

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