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012-Calcite and Gypsum $8.00
Mystery includes rock, fossil, or mineral sample and Mystery questions with teaching instructions.

Sample: A piece of crystalline calcite and a piece of gypsum (or selenite)

Teaching Objectives:
- To introduce the minerals calcite and gypsum
- To introduce the fingernail test for mineral hardness
- To introduce the concept of hardness as a difference between minerals and therefore as a way to identify them
- To introduce the Mohs Scale of Mineral Hardness

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