crystal shape: cubic fluorite crystal shape: dodecahedron garnet
Post on 18-Jan-2016
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Crystal Shape: Cubic Fluorite
Crystal Shape: Dodecahedron Garnet
Crystal Shape: Hexagonal Prism - Quartz
Crystal Shape: Octahedron Magnetite
One Cleavage PlaneTwo Cleavage Planes at right angles
Two Cleavage Planes not at right angles
Three Cleavage Planes at right angles Three Cleavage Planes not at right angles
Fracture
No well defined cleavage planes
Conchoidal Fracture
Physical Properties
Color and streak
Luster: Intensity of light reflected off a mineral Metallic, non-metallic- glassy (vitreous) and earthy (dull)
Physical Properties continued…
• Hardness: resistance to abrasion
• Mohs Scale (diagram below)
• Soft <2.5 fingernail will scratch mineral
• Hard >5.5 glass - mineral will scratch glass
• Medium 2.5 – 5.5 not scratched by fingernail and will not scratch glass
Other Properties
Taste
Reaction with acid
Specific Gravity The weight of a mineral compared to the same volume of water
Magnetism
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