Thread: Rock for ID?
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Old 22nd October 2018
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Re: Rock for ID?

I'm sure - Quartz

As you say it's amorphous, Gypsum would have been fibrous or "sugary" and Calcite would have showed rhombic cleavage

Flint is as noted by Jim another form of amorphous quartz. that basically means that it has no, to "very small" crystals and with the white form you have in these pictures it's going to be "very small"

Nice pure larger crystals (from a few mm across to huge) are the glassy form that PhillD is used to looking at

Regards
Andy
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