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Physical Properties of Minerals Pg. 29
(can be used to identify the mineral)1. Color- Can be misleading Can vary with the type of impurities
Physical Properties of Minerals (can be used to identify the mineral)
2. Luster- Surface reflection of light metallic = shiny like metal non-metallic = dull or reflects
light(but not like metals)
Pyrite has a metallic luster
Calcite has a non-metallic luster
Physical Properties of Minerals (can be used to identify the mineral)
3. Streak-The color of the powdered form of the mineral.
The color of the streak can be different than the mineral.Minerals must be softer than the streak plate.
Streak…can help identify quartz
http://www.childrensmuseum.org/geomysteries/cube/b3.html
Physical Properties of Minerals (can be used to identify the mineral)
4. Cleavage The way the mineral breaks
& Fracture Cleavage—minerals
break along smooth, flat surfaces.
Fracture—minerals that break at random
with rough or jagged edges.
Physical Properties of Minerals (can be used to identify the mineral)
5.Hardness- How easily a mineral scratches materials(or resists being scratched)
Mohs Hardness Scale Scale from 1 (softest) to 10 (hardest) Test by seeing if the mineral can scratch different objects (like human fingernail, copper penny, glass, steel file)
Name Color Luster Streak Color
Cleavage or Fracture
Hardness (1-10)
1.Hematite2. Pyrite3. Graphite4. Gypsum5. Halite6. Calcite7. Selenite8. Apatite9. Quartz10.Muscovite 11. Olivine12.Microcline