Minnesotaite
(same H-M symbol)
b = 9.419(2) Å,
c = 9.624(3) Å;
α = 85.21(3)°, β = 95.64(3)°,
γ = 90.00°; Z = 2
Minnesotaite is an iron silicate mineral with formula: (Fe2+,Mg)3Si4O10(OH)2. It crystallizes in the triclinic crystal system and occurs as fine needles and platelets with other silicates.[2] It is isostructural with the pyrophyllite-talc mineral group.[3]
Occurrence
Minnesotaite was first described in 1944 for occurrences in the banded iron formations of northern Minnesota for which it was named. Co-type localities are in the Cuyuna North Range, Crow Wing County and the Mesabi Range in St. Louis County.[3][5]
It occurs associated with quartz, siderite, stilpnomelane, greenalite and magnetite.[2][6] In addition to the low grade metamorphic banded iron formations it has also been reported as an alteration mineral associated with sulfide bearing veins.[3]
References
- ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- ^ a b c Handbook of Mineralogy
- ^ a b c d Minnesotaite on Mindat.org
- ^ Minnesotaite on Webmineral
- ^ Gruner, John (1946). The Mineralogy and Geology of the Taconites and Iron Ores of the Mesabi Range, Minnesota. Office of the Commissioner of the Iron Range Resources and Rehabilitation. p. 8,38.
- ^ Gruner, John W., The Composition and Structure of Minnesotaite, a Common Iron Silicate in Iron Formations, American Mineralogist, 1944, 29, 363-372
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- Aluminoceladonite
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- Parsettensite
- Stilpnomelane
- Structural groups mainly; based on rruff.info/ima, modified
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