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fuss

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Posts posted by fuss

  1. Microcrystalline and cryptocrystalline are synonymous terms, maybe you meant to say macrocrystalline Bob? Also for the OP, a hardness test would be most helpful, the first one posted looks like it could be Obsidian or common Opal but I think all of these might just be Chalcedony.

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  2. First one could be a carbonate rock or maybe even a quartzite, tough to say unless you can do the test Morlock suggested. Though a hardness (scratch) test would also be a good idea especially on the large protruding mineral as well as the general surface.

     

    Second one looks more like quartz to me than Fluorite and a hardness test will be an easy way to determine that. A steel knife will scratch Fluorite but not Quartz.

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