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
Myalla Road Syenite Complex, Cooma, Beresford Co., New South Wales, Australia


Locality type:Complex
Classification
Species:'Biotite' (not an IMA approved species)
Formula:K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Age information
Maximum recorded age:167 ± 3 Ma
Minimum recorded age:167 ± 3 Ma
Sample ages:
Recorded ageGeologic TimeSampleDating method
1167 ± 3 MaMiddle Jurassic - K-Ar
Sample references:
1 -
McDougall, I., & Wellman, P. (1976). Potassium?argon ages for some Australian Mesozoic igneous rocks. Journal of the Geological Society of Australia, 23(1), 1-9.
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Biotite data
Locality Data:Click here to view Myalla Road Syenite Complex, Cooma, Beresford Co., New South Wales, Australia
Data Identifiers
Mindat Occurrence Record ID:1367950
Long-form Identifier:1:3:1367950:9
GUID (UUID V4):0
Nearest other occurrences of Biotite
10.3km (6.4 miles) ⓘMonaro Copper Mine, Wallace Co., New South Wales, Australia
12.4km (7.7 miles) ⓘCooma, Beresford Co., New South Wales, Australia
17.3km (10.7 miles) ⓘGegedzerick Copper Mine (Gegedzerick Copper Lode; Gegedric Mine; Cootralantra M.C.P.'s), Berridale, Wallace Co., New South Wales, Australia
29.6km (18.4 miles) ⓘJyndabyne Copper Mine, Berridale, Wallace Co., New South Wales, Australia
29.8km (18.5 miles) ⓘUnnamed copper prospect, Berridale, Wallace Co., New South Wales, Australia
31.1km (19.4 miles) ⓘKydra Reefs, Beresford Co., New South Wales, Australia
33.7km (21.0 miles) ⓘKalkite prospect, Jindabyne, Wallace Co., New South Wales, Australia
36.9km (23.0 miles) ⓘMowamba Tin Mine (Channons Reward Mine), Jindabyne, Wallace Co., New South Wales, Australia
38.1km (23.7 miles) ⓘUndoo Creek workings, Numeralla, Beresford Co., New South Wales, Australia
38.4km (23.9 miles) ⓘJindabyne Copper prospect, Jindabyne, Wallace Co., New South Wales, Australia
References
Morrison, F. 1980. The geology of syenites at Benambra, NE Victoria. BSc (Hons) thesis. Australian National University.
McDougall, I., & Wellman, P. (1976). Potassium?argon ages for some Australian Mesozoic igneous rocks. Journal of the Geological Society of Australia, 23(1), 1-9.
Jaques, A. L., Creaser, R. A., Ferguson, J., & Smith, C. B. (1985). A review of the alkaline rocks of Australia. Verhandelinge van die Geologiese Vereniging van Suid-Afrika, 88(2), 311-334.
 
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