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Formula: MnCu4(AsO4)2(AsO3OH)2.9H2O
Hydrated arsenate,
ondrušite group,
lindackerite supergroup
Crystal System: Triclinic
Specific gravity: 3.213 calculated
Hardness: 2 to 3
Streak: White
Colour: Greenish yellow to yellowish green
Luminescence: Not fluorescent under UV
Solubility: Insoluble in water
Environments
Localities
In the Jáchymov ore district, Karlovy Vary Region, Czech Republic, klajite was found associated with
ondrušite and other
arsenate minerals growing on the
quartz gangue with
disseminated primary sulphides, namely
tennantite and
chalcopyrite
(MM 78.119-129).
At the type locality, RM-48 adit, Recsk, Pétervására District, Heves County, Hungary, klajite
was found in ore samples. The deposit is an epithermal high-sulphidation
copper - gold -
arsenic ore deposit, a classical occurrence of
enargite. The
primary ore consists of
enargite, luzonite,
pyrite, tennantite,
chalcopyrite, galena and
sphalerite.
Klajite occurs in the cavities of enargite and
quartz, in close association with other
secondary minerals including
gypsum and jarosite.
Klajite is a secondary mineral formed by the
decomposition of enargite. It forms irregular or sheaf-like
aggregates, up to 0.5 mm in diameter, made up of lath-like to thin tabular crystals, typically 0.05 to 0.2 mm
in length
(EJM 23.829-835).
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