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I'm not sure if these are obsidian snowflakes:
I found it near a river, hardness is 4 to 5, it has a wax lustre when pre-polished. The 'flakes' in the matrix are raised and gray.
These appear to be plagioclase crystals in basalt, diabase, or andesite. The crystals have alteration rims, rather than a snowflake pattern.
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12 months ago
11 months ago