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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Biotite from
Narrap Mine, Okiep Copper District, Namakwa District Municipality, Northern Cape, South Africa


Locality type:Mine
Classification
Species:'Biotite' (not an IMA approved species)
Formula:K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Biotite data
Locality Data:Click here to view Narrap Mine, Okiep Copper District, Namakwa District Municipality, Northern Cape, South Africa
Data Identifiers
Mindat Occurrence Record ID:619635
Long-form Identifier:1:3:619635:6
GUID (UUID V4):0
Nearest other occurrences of Biotite
3.6km (2.2 miles) ⓘKliphoog Mine, Concordia, Okiep Copper District, Namakwa District Municipality, Northern Cape, South Africa
3.7km (2.3 miles) ⓘOkiep Copper District, Namakwa District Municipality, Northern Cape, South Africa
7.6km (4.7 miles) ⓘKoperberg Mine, Carolusberg, Okiep Copper District, Namakwa District Municipality, Northern Cape, South Africa
14.4km (9.0 miles) ⓘNababeep Mine, Nababeep, Okiep Copper District, Namakwa District Municipality, Northern Cape, South Africa
15.2km (9.5 miles) ⓘNababeep West Mine (Nababeep Near West mine), Nababeep tungsten mines, Nababeep, Okiep Copper District, Namakwa District Municipality, Northern Cape, South Africa
65.0km (40.4 miles) ⓘKokerboomrand pegmatite, Steinkopf, Nama Khoi Local Municipality, Namakwa District Municipality, Northern Cape, South Africa
69.6km (43.2 miles) ⓘNoumas I pegmatite (Blesberg), Steinkopf, Nama Khoi Local Municipality, Namakwa District Municipality, Northern Cape, South Africa
70.2km (43.6 miles) ⓘNorabees I pegmatite, Norrabees pegmatites I-VI, Steinkopf, Nama Khoi Local Municipality, Namakwa District Municipality, Northern Cape, South Africa
70.9km (44.1 miles) ⓘNorrabees pegmatites I-VI, Steinkopf, Nama Khoi Local Municipality, Namakwa District Municipality, Northern Cape, South Africa
74.2km (46.1 miles) ⓘHotson 6 Mine, Koenabib farm, Khâi-Ma Local Municipality, Namakwa District Municipality, Northern Cape, South Africa
References
Ronaldson, J. H. (1905) Notes on the Copper Deposits of Little Namaqualand. Transactions of the Geological Society of South Africa 8:158-166.
Stein, H. J., Raith, J. G. (2000) Re-Os dating and sulfur isotope composition of molybdenite from tungsten deposits in western Namaqualand, South Africa: implications for ore genesis and the timing of metamorphism. Mineralium Deposita, 35 (8) 741-753 doi:10.1007/s001260050276
 
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