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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Dumortierite from
Almgjotheii, Flatestøl, Lund, Rogaland, Norway


Locality type:Outcrop
Classification
Species:Dumortierite
Formula:Al(Al2O)(Al2O)2(SiO4)3(BO3)
Comments:Ti-poor and High Ti-rich dumortierites.
- The blue and purple variety as > 2 mm large grains closely associated with borasilite, and as prisms 1 cm in length.
- Rose coloured Ti-rich variety as grains and aggregates up to 6mm across.
Colour:Rose (Ti-rich): Blue to purple
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Dumortierite data
Locality Data:Click here to view Almgjotheii, Flatestøl, Lund, Rogaland, Norway
Data Identifiers
Mindat Occurrence Record ID:27635
Long-form Identifier:1:3:27635:7
GUID (UUID V4):0
Nearest other occurrences of Dumortierite
80.5km (50.0 miles) ⓘUndeland 02 Feldspar Quarry (Beryl quarry), Undeland, Evje og Hornnes, Agder, 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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