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 the Blanca Mine, San Juan, Miraflores, Antofagasta Province, Antofagasta, 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).
Lavendulan from Jáchymov - Image
At the Cap Garonne Mine, Le Pradet, Toulon, Var, Provence-Alpes-Côte d'Azur, France, lavendulan is associated
with chalcophyllite,
cyanotrichite, parnauite,
mansfieldite, olivenite,
tennantite, covellite,
chalcanthite, antlerite,
brochantite and geminite
(HOM).
Lavendulan from Cap Garonne - Image
At Bou Azzer, Tansifte Caïdat, Agdz Cercle, Zagora Province, Drâa-Tafilalet Region, 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 the Imiter mine, Imiter mining district, Tinghir Cercle, Tinghir Province, Drâa-Tafilalet Region, Morocco,
lavendulan has been found associated with
erythrite
(MinRec 42.2.125).
At Tsumeb, Oshikoto Region, Namibia, lavendulan is associated with cuprian
adamite,
conichalcite, o’danielite,
tsumcorite, fahleite,
quartz, calcite and
gypsum
(HOM).
Lavendulan from Tsumeb - Image
At the Mohawk Mine, Mohawk, Allouez Township, Keweenaw County, Michigan, USA, fibrous light blue lavendulan
has been found with white rauenthalite on oxidised
domeykite and algodonite
(Mindat photo).
Lavendulan from the Mohawk Mine - Image
At the San Rafael mine, Nye county, Nevada, USA, lavendulan is associated with
scorodite
(R&M 85.6.519).
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