1. Minerals A. can be liquids B. are organicC. are inorganic D. have no crystal structure
2. is a measure of how easily a mineral is scratched.A. luster B. cleavageC. hardness D. fracture
3. The color of a minerals powder on an unglazed porcelain tile is .A. luster B. hardnessC. density D. streak
4. When halite breaks it displays .A. fracture B. cleavageC. luster D. crystal form
5. Halite forms crystals.A. triclinic B. monoclinicC. hexagonal D. cubic
ReviewReviewMinerals Identifying minerals
Igneous RocksIgneous RocksRocks formed from melted minerals
Igneous RocksIgneous RocksSome have crystalsSlow cooling = “large” crystals –Granite
Granite
Igneous RocksIgneous RocksFast cooling = “small” crystals - Basalt
Basalt
Granite Basalt
Igneous RocksIgneous RocksExtra fast cooling = no crystals
Obsidian: Volcanic, “Glassy”
Pumice: Volcanic, “Frothy”Pumice: Volcanic, “Frothy”
Krakatoa Island 1883
Pumice: Volcanic, “Frothy”
Mt. St. Helens 1980