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Formula: Fe3+4(PO4)3(SO4)(OH)(H2O)10.nH2O (5 ≤ n ≤ 14)
Phosphate
Crystal System: Triclinic
Specific gravity: 2.05 to 2.09 measured, 1.782 to 1.856 calculated
Hardness: 3
Streak: White
Colour: Colourless to pinkish to lilac under incandescent light, white to yellowish under sunlight
Luminescence: Not fluorescent under UV
Solubility: Very slowly soluble in concentrated hydrochloric acid at room temperature
Environments
Volcanic igneous environments
Metamorphic environments
Bohuslavite is a relatively new mineral, approved in 2019.
Localities
There are two co-type localities, Horní Město, Bruntál District, Moravian-Silesian Region, Czech Republic, and Buca
della Vena Mine, Pontestazzemese, Stazzema, Lucca Province, Tuscany, Italy.
The Buca della Vena mine exploited a small
baryte-pyrite-iron oxide
ore deposit.
The Horní Město ore deposit is an example of metamorphosed
iron-zinc-lead-(silver)
sulphide mineralisation in volcano-sedimentary rocks.
At the Buca della Vena mine, bohuslavite is associated with gypsum in
fractures of pyrite-rich phyllite.
Rarely, it has also been observed in vugs of
quartz-albite veins, associated with
pyrite.
A similar mineral association has been observed at the Horní Město ore deposit, where bohuslavite was rarely
found in fissures of quartz–carbonate veins, in association with abundant
white to colourless gypsum.
It seems likely that at these localities the genesis of bohuslavite is related to the action of sulphuric acid
generated by the pyrite oxidation on phosphate-bearing phases such as
apatite.
At both occurrences, bohuslavite occurs as tabular crystals with pseudohexagonal outline, up to 250 microns in
size, forming globular aggregates up to 1 mm across. The mineral is colourless to pinkish to lilac under incandescent
light; under sunlight, it is white to yellowish
(EJM 31.1033-1046).
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