Gypsum Mineral Specimen, Gypsum Mineral Specimen ideal for use in study of cleavage and fracture as example of imperfect cleavage planes., Pack of 12

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For use in learning about mineral hardnessGypsum is soft enough to be scratched by fingernailOne of the standards on Mohs hardness scale (value of 2)Similar appearance to other minerals therefor useful in identification exercisesCrystals grow in soft, wide sheets, but is also commonly found filling veins and fractures in other rock