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San Diego Natural History Museum
San Diego Natural History Museum: Mineral Matters: Hardness
Identifying a mineral by hardness? This website explains how to use the Mohs' hardness scale and provides examples.
![Indiana University: Anhydrite and Gypsum: Indiana's Evaporite Minerals [Pdf] Handout](https://static.lp.lexp.cloud/images/attachment_defaults/resource/large/FPO-knovation.png "Indiana University: Anhydrite and Gypsum: Indiana's Evaporite Minerals [Pdf] Handout")
Indiana University
Indiana University: Anhydrite and Gypsum: Indiana's Evaporite Minerals [Pdf]
A fact card describing the physical and chemical characteristics of anhydrite and gypsum, where they can be found in Indiana, what they are used for, their chemical structures, and where they fit on Mohs hardness scale.
Indiana University
Indiana Univ. Bloomington: Reference Documents: Pyrite "Fool's Gold" [Pdf]
A fact card describing the properties and characteristics of pyrite, where it is found, its effects on its immediate environment, its chemical structure, and where it fits on Mohs hardness scale.