美國 Scott 出品，原廠包裝。
本組含6個標本。
每種礦物斷裂，依結晶成分的不同，而成不同的裂紋。
Cleavage is a readily recognizable property of some minerals and follows the internal crystal structure of that mineral.
Terms used in a study of crystallography apply to the cleavage plans.
6 specimens approximately 1 1/2" x 1 1/2".
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