Yingjiangite - Yellow needles with intensive luster of Yingjiangite (EDS- and SXRD-analysed). Field of view app. 1 mm. — Photo: J. Gröbner · CC BY-SA 3.0 de
Yingjiangite
Yingjiangite is a mineral named after its type locality in the Yingjiang county in 1990. It is a member of the phosphuranylite group.
Intro adapted from Wikipedia (CC BY-SA).
Yingjiangite is an IMA-recognized mineral species in the phosphate class, with the chemical formula K₂Ca(UO₂)₇(PO₄)₄(OH)₆·6H₂O.
It crystallizes in the orthorhombic crystal system (space group C222_1). It is a member of the Phosphuranylite structural group.
Key properties: Mohs hardness 3–4; specific gravity 4.15; Subadamantine to resinous luster; optically biaxial.
IMA symbol Yin, IMA status: approved, named in 1989.
Found as a secondary mineral in an oxidized zone of a uranium deposit (Tongbiguan village, China).
It is found associated with Studtite, calcurmolite, tengchongite, autunite (Tongbiguan village, China).
The name refers to Yingjiang Co., China, within which it was first noted.