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7Sci CH10

7th Science CH10 Minerals and Their Uses

cleavage ability of a mineral to break along a smooth flat surface as a result of the orderly arrangement of the atoms making up its crystals; mica and bariet have perfect cleavage
fracture ability of a mineral to split into pieces with rough, jagged, or curved surfaces; quartz is a mineral with fracture
gem valuable, rare mineral; examples include diamonds, sapphires, rubies and emeralds
hardness property that can help identify a mineral; a measure of how easily a specific mineral can be scratched
mineral inorganic, naturally occurring, crystalline structure with a unique chemical composition; a mineral can be an element or compound; examples include graphite, diamonds, and halite
streak color of a mineral obtained when it is broken up and powdered or when a piece of the mineral is rubbed across a streak plate; a mineral’s color can provide clues to its identity