Glass Stones
Are diamonds the only stones that cut glass?
I found this weird rock that looks like kryptonite or something,and it cuts glass.
Window glass has a hardness of 5.5 on the Moh's hardness scale, and so could be scratched by feldspar, quartz, topaz, corrundum and diamond. Nearly all precious and semi-precious gems are harder than glass, so scratching glass is no test for a diamomd.
Here's a reference to Moh's scale:
http://en.wikipedia.org/wiki/Mohs_scale
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How to Make Stained Glass Stepping Stones : How to Pour Grout for Stained Glass Stepping Stones
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