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Week of 10.17 Vocab

TermDefinition
Hardness Ability of a mineral to resist scratching.
Luster How the surface of a mineral appears when it reflects light.
Streak The color of a mineral seen when rubbed on a streak plate.
Streak Plate An unglazed piece of porcelain, such as a tile, used to test the characteristic streak of minerals by rubbing the mineral across the tile.
Moh's Scale of Hardness A scale of hardness used in mineralogy. Its degrees, in increasing hardness, are: talc 1; gypsum 2; calcite 3; fluorite 4; apatite 5; feldspar 6; quartz 7; topaz 8; sapphire 9; diamond 10.
Mineral Naturally formed, inorganic compounds that have a definite chemical composition and a definite crystal structure.
Metallic Luster This type of luster allows a mineral to appear shiny like a metal.
Non-metallic Luster This type of luster allows a mineral to appear either glassy (Quartz), pearly (Talc), greasy (Graphite), silky (Gypsum), resinous (Sulfur), or adamantine (Diamond).
Cleavage Refers to the way some minerals break along certain lines of weakness in their structure.
Fracture A description of the way a mineral tends to break, such as conchoidal (smooth curves), hackly (sharp jagged edges), uneven (rough and irregular), and fibrous (shows fibers).
Created by: Ms.Sites
 

 



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