1-2"
Mohrite is a rare ammonium iron sulfate mineral originally found in the geothermal fields of Tuscany, Italy. Named after the famous analytical chemist Karl Friedrich Mohr, this Fe-dominant analog of boussingaultite is found in various geologic environments and is prized by mineral collectors for its rarity and unique properties This Fe-dominant analogue of boussingaultite is sometimes reported from burning coal dumps where it is a product of pyrite oxidation. While that isn't the most charming of places for crystallization to happen, the results are undeniable pretty. The crystals take on a sugary appearance that reminds us of rock candy (please do not eat it).
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