glass plate, 2" x 2" with sanded edges - student unit of 5
Useful in testing mineral hardness. Glass is 5 1/2 on the Mohs' scale of mineral hardness, so if your mineral scratches glass, it is harder than that. Orthoclase feldspar is 6 and quartz is 7 on that scale.
We normally sell these in sets of five for $3.50, but also have them listed them as single plates for those who need just one and are ordering it with other specimens.
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