Johannite forms spherical aggregates of apple green color, reaching sizes of up to 1 mm and sitting on a matrix. They often intergrow, sit on each other, and thus form accumulations. Also, on this specimen, johannite forms fine-grained coatings. On the specimen, johannite occurs together with colorless gypsum. This is a high-quality and very rich example of this uranyl sulfate, which comes from the Svornost mine in Jáchymov. Jáchymov is the type locality for this mineral.
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Localities, Czech Republic, Mineral Classification, Sulfates, Size, Micromounts, Type Localities
Johannite
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Location: Jáchymov, důl Svornost, ČR [en]
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