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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Arfvedsonite from
Saima U-REE deposit, Kuandian County, Dandong, Liaoning, China


Locality type:Deposit
Classification
Species:Arfvedsonite
Formula:NaNa2(Fe42+Fe3+)Si8O22(OH)2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Arfvedsonite data
Locality Data:Click here to view Saima U-REE deposit, Kuandian County, Dandong, Liaoning, China
Data Identifiers
Mindat Occurrence Record ID:734488
Long-form Identifier:1:3:734488:6
GUID (UUID V4):0
Nearest other occurrences of Arfvedsonite
3.5km (2.2 miles) ⓘFluorsigaiite type locality, Fengcheng City, Dandong, Liaoning, China
References
(1978) Uranium Deposit in the Saima Alkaline Massif, Northeast China. Scientia Sinica, 21 (3) 365-389
Ju, Nan; Liu, Bo; Gong, Yanan; Qiu, Kunfeng; Wu, Yue; Liu, Xin; Shi, Lu; Nan, Zhe; Ma, Danzhen; Wang, Haoheng; et al. (2025) Apatite U-Pb ages, trace elements, and in situ Sr-Nd isotopes and pyrite S isotopes of the Saima alkaline complex: Implications for the petrogenesis and tectonic setting of Nb-Ta-REE mineralization in Northeast China. Ore Geology Reviews, 183. 106704 doi:10.1016/j.oregeorev.2025.106704
 
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