Minnesotaite
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Minnesotaite is an iron silicate mineral with formula: 3Si4O102. It crystallizes in the triclinic crystal system and occurs as fine needles and platelets with other silicates. It is isostructural with
Minnesotaite
Greenalite
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Greenalite is a mineral in the kaolinite-serpentine group with the chemical composition 2-3Si2O54.
Minnesotaite
…are in the Cuyuna North Range, Crow Wing County and the Mesabi Range in St. Louis County. It occurs associated with quartz, siderite, stilpnomelane, greenalite and magnetite. In addition to the low grade metamorphic banded iron formations it has also been reported as an alteration mineral associated with sulfide…
Greenalite (green) with galena and siderite, from Spain