10 x 6.7 x 2.5 cm. This is a beautiful plate from the mid-1800s in all likelihood, with sharp hessite crystals of 3 distinct crystal habits for the species, all perched in isolated clusters on contrasting quartz matrix. The largest cluster is 4 cm tip to tip, with the sharp spear sticking out the top. Ex. R. Metzger Collection.
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Photo added: 31st Jul 2008