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Formula: K2Ca(UO2)7(PO4)4(OH)6.6H2O
Hydrated phosphate containing hydroxyl, phosphuranylite group
Crystal System: Orthorhombic
Specific gravity: 4.15 measured, 4.17 calculated
Hardness: 3 to 4
Streak: Pale yellow
Colour: Yellow, golden yellow
Luminescence: Weak yellowish green fluorescence under short wave UV for Chinese specimens
Common impurities: Na,Mg,Mn,Fe,Ti,Si
Strongly RADIOACTIVE
Environments
Localities
At the type locality, the Uranium occurrence, Tongbiguan, Yingjiang County, Dehong, Yunnan, China, yingjiangite
occurs as a secondary product in an oxidised zone containing
uraninite and uranothorite.
Associated minerals are studtite,
calcurmolite, tengchongite
and autunite
(AM 76.1731).
At Johanngeorgenstadt, Erzgebirgskreis, Saxony, Germany, yingjiangite is a relatively recently discovered (~2005)
member of the uranium suite. It was found at the Schaar shaft as pale greenish
yellow, acicular crystals associated with uraninite. In contrast to examples
from China, the Johanngeorgenstadt specimens show no fluorescence. Additional material was found with
uraninite on an old collection piece from Johanngeorgenstadt; This specimen
is possibly the oldest known example of yingjiangite
(Minrec 55.5.626-628).
Yingjiangite from Johanngeorgenstadt -
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