Formula: NaCaCu5(AsO4)4Cl.5H2O
Hydrated arsenate containing halogen, lavendulan group, dimorph of lemanskiite
Specific gravity: 3.84
Hardness: 2½ to 3
Streak: Light blue
Colour: Lavender blue (Dana)
Environments:
lavendulan is a rare secondary mineral in the oxidised zone of some copper
arsenic deposits.
At Joachimstal, Bolivia, lavendulan is associated with erythrite
(AM9.29-30).
At San Juan, Chile, lavendulan is associated with erythrite,
cuprite and malachite
(HOM).
At the Cap Garonne mine, France, lavendulan is associated with chalcophyllite,
cyanotrichite, parnauite,
mansfieldite, olivenite,
tennantite, covellite,
chalcanthite, antlerite,
brochantite and geminite
(HOM).
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).
At the San Rafael mine, Nye county, Nevada, USA, lavendulan is associated with
scorodite
(R&M 85.6.519).
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