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solid, inorganic substance, found naturally in the earth What are 3 requirements of a mineral? luster the way a mineral shines or does not shine dull, silky, glassy Name 3 types of luster streak a mark made by a mineral on a streak plate that shows its true color when ground into a powder hardness how easily a mineral can be scratched cleavage the way a mineral divides naturally on a flat surfcace fracture when a mineral breaks unevenly or shatters cubic, 8 sided What are two types of cleavage pyrite and galena Whate are two minerals with a metalic luster gypsum The only mineral with a silky luster colorless, glassy luster What two ways are quartz and calcite alike talc, caclite what are two minerals that have cleavage pyrite and galena What are two minerals that are heavy