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Formula: Bi2O(VO4)(OH)
Vanadate of bismuth,
atelestite group
Crystal System: Monoclinic
Specific gravity: 6.87 calculated
Hardness: 4½
Streak: Yellow
Colour: Brown
Luminescence: Not fluorescent under UV
Solubility: Soluble in dilute hydrochloric acid
Environments
Pegmatites
Metamorphic environments
Localities
At the type locality, the Hechtsberg quarry, Hausach, Hausach, Ortenaukreis, Freiburg Region, Baden-Württemberg,
Germany, hechtsbergite is associated with chrysocolla,
bismutite, beyerite,
namibite, mixite and
eulytine in minute cavities in
gneiss
(AM 83.400-401).
Hechtsbergite from the Hechtsberg Quarry -
Image
At Nagatare, Fukuoka City, Fukuoka Prefecture, Japan, the ore body is a
granite
pegmatite containing
lepidolite, elbaite and
petalite. Namibite and
hechtsbergite were found with clinobisvanite,
waylandite, eulytine,
beyerite and bismutite. This
assemblage occurs as secondary minerals and forms crusts and
euhedral crystals associated with lepidolite,
quartz, albite and
cookeite.
Hechtsbergite is yellow in colour, and is found as fine isolated crystals or aggregates
(Journal of Mineralogical and Petrological Sciences, 108.2.105-110).
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