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The answer is chalcedony, which is microcrystalline quartz with some moganite. The shield shape of the gem is unusual. โ๏ธ๐งช๐Another Tuesday Guess The Gem for you!! What mineral or variety do you think this gem is? Hint: this variety is microcrystalline. โ๏ธ๐งช๐ Rats! I didn't log on. But I instantly knew that one as I lurrrve Chalcedony!