Legrandite

Infobox mineral
name = Legrandite
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caption = Yellow radiating prismatic crystals on limonite
formula = Zn₂(AsO₄) (OH)·(H₂O)
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color = Yellow or yellowish orange to colourless
habit = Crystalline, prismatic
system = Monoclinic
twinning =
cleavage = Imperfect, poor in one direction
fracture = Brittle, conchoidal
mohs = 4.5-5
luster =
refractive = 1.675-1.74
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streak = White
gravity = 4.0
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Legrandite is a rare arsenate mineral, discovered in 1934 and named after the Belgian mining engineer Legrand. Chemically, it is a hydrated zinc arsenate hydroxide, found as a secondary mineral in zinc ores, often in association with limonite. The most notable source of the mineral is the now abandoned Ojuela mine in Durango, Mexico. It is highly praised for its vitreous rich yellow colour and is a desirable item among mineral collectors.

References

* [http://www.mindat.org/min-2365.html MinDAT]
* [http://webmineral.com/data/Legrandite.shtml Webmineral]
* [http://www.galleries.com/minerals/phosphat/legrandi/legrandi.htm Mineral galleries]