Images
Formula: Ca(VO)2(PO4)2.4H2O
Hydrated phosphate-vanadate
Crystal System: Tetragonal
Specific gravity: 2.84 to 2.98 measured, 2.97 calculated
Hardness: 1 to 2
Streak: Green
Colour: Grass-green, yellow- to olive-green, brownish green, blue-green; light green, olive-green, brownish green,
yellowish green; bluish green in transmitted light
Solubility: Readily soluble in dilute acids to a blue solution, insoluble in water
Environments
Localities
At the type locality, Sincos, Sincos district, Jauja province, Junín, Peru, sincosite occurs as
veinlets in black carbonaceous shale, associated with
gypsum
(Mindat).
Sincosite from Sincos - Image
At the Ross Hannibal Mine, Lead Mining District, Lawrence County, South Dakota, USA, sincosite is associated
with minyulite
(HOM).
Sincosite from the Ross Hannibal Mine -
Image
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