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Glass Plate, Pkg of 10 $5.00
These sturdy, thick glass plates are useful for determining mineral hardness.  The plate has a hardness of 5.5, so minerals (like quartz) harder than the glass will scratch it, while softer minerals will not.  The plates are hand cut for us 2" x 2" x 1/4" thick, with rounded  edges and corners. 

A comprehensive mineral identification key by  the Mineralogical Society of America may be found at the web site:         
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Ruth Deike
Rock Detective Geoscience Education
395 Deer Run Drive
Nellysford , VA 96080

Phone: 434-263-3737



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