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fuss

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Posts posted by fuss

  1. Your purple rock is mica schist (purple mica is called lepidolite), I happen to have some samples from Australia myself.

    As far as the other stuff goes I'm not so sure what needs to be cleaned. If its dust/dirt covered you can rinse in and gently scrub in water. If you are trying to remove iron oxide stains iron out works well for that, for removing carbonate material you can try to remove with vinegar or stronger acids like muriatic.

  2. 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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  3. 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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