Vote for your favorite mineral in #MinCup26! - Sphalerite vs. Anorthite
Both zinc ore Sphalerite and calcium plagioclase feldspar Anorthite have perfect cleavage that will split cleanly if you hit them with a hammer, but only one can claim a larger split of your votes!
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Muscovite from
Rubikon Mine, Okongava Ost Farm 72, Karibib Constituency, Erongo Region, Namibia


Locality type:Mine
Classification
Species:Muscovite
Formula:KAl2(AlSi3O10)(OH)2
Age information
Maximum recorded age:515 ± 36 Ma
Minimum recorded age:515 ± 36 Ma
Sample ages:
Recorded ageGeologic TimeSampleDating method
1515 ± 36 MaCambrian Series 24Rb-Sr
Sample references:
14
Haack, U., & Gohn, E. (1988). Rb-Sr data on some pegmatites in the Damara Orogen, Namibia. Communications of the Geological Survey of South West Africa/Namibia, 4, 15-19.
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Muscovite data
Locality Data:Click here to view Rubikon Mine, Okongava Ost Farm 72, Karibib Constituency, Erongo Region, Namibia
Data Identifiers
Mindat Occurrence Record ID:708703
Long-form Identifier:1:3:708703:5
GUID (UUID V4):0
Nearest other occurrences of Muscovite
7.8km (4.9 miles) ⓘHelikon II pegmatite, Okongava Ost Farm 72, Karibib Constituency, Erongo Region, Namibia
12.4km (7.7 miles) ⓘOtjua Mine, Otjua Farm 37, Karibib Constituency, Erongo Region, Namibia
27.3km (17.0 miles) ⓘNavachab Gold Mine, Farm Navachab, Karibib Constituency, Erongo Region, Namibia
30.2km (18.8 miles) ⓘTwin Hills prospects, Karibib Constituency, Erongo Region, Namibia
39.4km (24.5 miles) ⓘEtiro pegmatite, Etiro Farm 50, Karibib Constituency, Erongo Region, Namibia
40.5km (25.2 miles) ⓘUsakos tourmaline mine, Usakos, Karibib Constituency, Erongo Region, Namibia
46.8km (29.1 miles) ⓘGiftkuppe, Omaruru Constituency, Erongo Region, Namibia
50.9km (31.6 miles) ⓘTsaobismund pegmatite, Tsaobismund Farm 85, Karibib Constituency, Erongo Region, Namibia
54.3km (33.7 miles) ⓘVan der Made pegmatite, Schlucht Farm 162, Karibib Constituency, Erongo Region, Namibia
59.2km (36.8 miles) ⓘDavib Mine, Davib Ost Farm 61, Karibib Constituency, Erongo Region, Namibia
References
giantcrystals.strahlen.org (n.d.) http://giantcrystals.strahlen.org/africa/rubicon.htm
Broccardo, L., Kinnaird, J. A., & Nex, P. A. M. (2011). Preliminary fluid inclusion results from the Rubicon pegmatite, Karibib, Namibia. Asociación Geológica Argentina, Serie D, publicación especial No, 14, 45-48.
Ashworth, L. (2014). Mineralised Pegmatites of the Damara Belt, Namibia: Fluid inclusion and geochemical characteristics with implications for post-collisional mineralisation (Doctoral dissertation, Faculty of Science, University of the Witwatersrand).
 
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