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Formula: Fe3+Sn(OH)5O
Oxide containing hydroxyl, schoenfliesite subgroup,
perovskite supergroup,
paramorph of
natanite
Crystal System: Tetragonal
Specific gravity: 3.81 measured, 3.81 calculated
Hardness: 3½
Streak: Light yellow
Colour: Brownish orange
Solubility: Slowly soluble in cold hydrochloric acid
Common impurities: Mn,(Mg,Si)
Environments
Jeanbandyite has been found in the oxide zone of polymetallic hydrothermal deposits as crystal aggregates in epitactic growth on
vertices of crystals of wickmanite or natanite
(Dana, Webmin).
Localities
At the type locality, the Siglo Veinte mine, Llallagua, Rafael Bustillo, Potosí, Bolivia, jeanbandyite has been found in a region
of hydrothermal tin mineralisation in a highly altered acid igneous stock (Mindat).
The jeanbandyite occurs as epitactically oriented overgrowths on the corners of octohedrons of
wickmanite, in most cases completely enclosing the host crystal. It also occurs on massive
stannite, and separately with fluorapatite,
stannite and cassiterite. Elsewhere in the mine
it occurs with wolframite, bismuthinite,
stannite and pyrite and also with
franckeite, stannite and
pyrite. Jeanbandyite has been found on the mine dumps covered by a crust of
plumbogummite and associated with cassiterite,
quartz,
pyrite and muscovite
(Min Rec 37-2.140-142, AM 68.471).
At Santa Eulalia, Mexico, jeanbandyite occurs as an epitaxial overgrowth on wickmanite
associated with natanite, pyrrhotite,
siderite and quartz
(HOM)
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