Images
Formula: NaCaCu5(AsO4)4Cl.5H2O
Hydrated arsenate containing halogen,
lavendulan group,
paramorph of
lemanskiite
Crystal System: Monoclinic
Specific gravity: 3.54 measured, 3.597 calculated
Hardness: 2½ to 3
Streak: Light blue
Colour: Lavender blue
Environments:
Lavendulan is a rare secondary
arsenate in the oxidised zone of some
copper
arsenic deposits.
Localities
At Joachimstal, Bolivia, lavendulan is associated with erythrite
(AM 9.29-30).
At San Juan, Chile, lavendulan is associated with erythrite,
cuprite and malachite
(HOM).
At the type locality for lavendulan, Jáchymov, Karlovy Vary District, Karlovy Vary Region, Czech Republic,
ondrušite is commonly associated with
lindackerite, geminite,
lavendulan, slavkovite,
strashimirite, olivenite,
picropharmacolite and
köttigite
(CM 49.885-897).
Image
At the Cap Garonne mine, France, lavendulan is associated with
chalcophyllite,
cyanotrichite, parnauite,
mansfieldite, olivenite,
tennantite, covellite,
chalcanthite, antlerite,
brochantite and geminite
(HOM).
Image
At Bou Azzer, Morocco, lavendulan is associated with erythrite. At
Tamdrost it is
associated with pharmacosiderite and
arseniosiderite. At Méchoui it has been found in
dolostone associated with
chalcocite,
covellite and conichalcite.
At Ightem it is associated with conichalcite, and at Oumlil it is
associated with
erythrite and scorodite
(MinRec 38.5.381-382).
At Imiter, Morocco, lavendulan has been found associated with
erythrite
(MinRec 42.2.125).
At Tsumeb, Namibia, lavendulan is associated with cuprian adamite,
conichalcite, o’danielite,
tsumcorite, fahleite,
quartz, calcite and
gypsum
(HOM).
Image
At the San Rafael mine, Nye county, Nevada, USA, lavendulan is associated with
scorodite
(R&M 85.6.519).
Back to Minerals