Vote for your favorite mineral in #MinCup26! - Quartz vs. Asagiite
It's a classic vs a newbie as the most common named mineral in the crust Quartz is up against an exceedingly-rare sea foam-green mineral discovered just a few years ago Asagiite.
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Hercynite from
Almgjotheii, Flatestøl, Lund, Rogaland, Norway


Locality type:Outcrop
Classification
Species:Hercynite
Formula:Fe2+Al2O4
Comments:Hercynite-quartz high-grade assemblages (Belongs to M2 assemblage)(cf. Eur. J. Mineral. , 1991, 3, pp. 367-386).
Replaces sillimanite and envelopped by cordierite or plagioclase.
Composite grains with magnetite, surrounded by cordierite or enclosed within osumilite.
Confirmation
Validity:Believed Valid
Associated Minerals:
Associates:Cordierite
Magnetite
Quartz
Sillimanite
Data
Mineral Data:Click here to view Hercynite data
Locality Data:Click here to view Almgjotheii, Flatestøl, Lund, Rogaland, Norway
Data Identifiers
Mindat Occurrence Record ID:321746
Long-form Identifier:1:3:321746:7
GUID (UUID V4):0
Nearest other occurrences of Hercynite
25.3km (15.7 miles) ⓘSapphirine locality, Ivesdalsfjellet, Vikeså, Bjerkreim, Rogaland, Norway
34.8km (21.6 miles) ⓘOsumilite-bearing granulite, Vikeså, Bjerkreim, Rogaland, Norway
References
Grew, Edward S., McGee, James J., Yates, Martin G., Peacor, Donald R., Rouse, Roland C., Huijsmanns, Joep P. P., Shearer, Charles K., Wiedenbeck, Michael, Thost, Douglas E., Su, Shu-Chun (1998) Boralsilite (Al16B6Si2O37); a new mineral related to sillimanite from pegmatites in granulite-facies rocks. American Mineralogist, 83 (5) 638-651 doi:10.2138/am-1998-5-624
 
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