- Legrandite
Infobox mineral
name = Legrandite
category =
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caption = Yellow radiating prismatic crystals on limonite
formula = Zn2(AsO4) (OH)·(H2O)
molweight =
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
opticalprop =
birefringence =
pleochroism =
streak = White
gravity = 4.0
melt =
fusibility =
diagnostic =
solubility =
diaphaneity =
other =Legrandite is a rare
arsenate mineral , discovered in1934 and named after the Belgian mining engineerLegrand . Chemically, it is a hydratedzinc arsenate hydroxide , found as a secondarymineral in zincore s, often in association withlimonite . The most notable source of the mineral is the now abandonedOjuela mine inDurango ,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]
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