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Shigaite crystal. A very uncommon mineral, this extremely hydrated (has 8 to 22 waters in its chemical formula) Manganese-Aluminum sulfate is captured here in a Joe Budd image. Shigaite was discovered in Shiga Perfecture, Japan, 27 years ago. Shigaite is also found in Michigan's Iron Range, Mont Saint-Hilaire-Quebec, and at the Wessels Mine in South Africa.