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Formula: V4+O(SO4).5H2O
Hydrated acid sulphate, minasragrite group, monoclinic paramorph of
triclinic anorthominasragrite and orthorhombic
orthominasragrite
Crystal System: Monoclinic
Specific gravity: 2.03 measured, 2.06 calculated
Hardness: 1 to 2
Streak: Light blue
Colour: Blue, blue in transmitted light
Solubility: Dissolves readily in water
Environments
Localities
At the type locality, the Ragra mine (Minasragra), Huayllay District, Pasco Province, Pasco, Peru, minasragrite occurs
as efflorescences on patronite in a rich deposit of
vanadian materials in fissures
that cut red shale. Associated minerals include
melanterite, morenosite,
dwornikite, retgersite,
szomolnokite, alum-(K) and
gypsum, as well as patronite
(HOM).
At the North Mesa Mine group, Temple Mountain, San Rafael Mining District, Emery county, Utah, USA, minasragrite has
been found in a silicified tree, formed as an oxidation product of pyrite reacting
with vanadium-rich organic material. Associated minerals include
orthominasragrite, pyrite,
sulphur and iron sulphates
(HOM).
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