Images
Formula: CaZn2(AsO4)2.2H2O
Valence: CaZn2+2(As5+O4)2.2H2O
Hydrated arsenate,
tsumcorite group
Crystal System: Monoclinic
Specific gravity: 4.23 measured, 4.29 calculated
Hardness: 3
Streak: Pale orange to yellow-orange
Colour: Dark red, dark orange-brown, pale pinkish, white
Luminescence: Not fluorescent under UV
Common impurities: Mn
Environments
Localities
At the type locality, the Ojuela Mine, Mapimí, Mapimí Municipality, Durango, Mexico, lotharmeyerite forms dark
reddish-orange, equant, vitreous crystals, which are invariably twinned. Indices of refraction are above 1.80; it
occurs as druse encrustations on adamite and
manganese oxides which are
cryptomelane in part
(AM 68.849).
Lotharmeyerite occurs in the oxidised zone of the arsenic-rich
polymetallic base-metal deposit, associated with adamite,
cryptomelane,
chalcophanite and goethite
(HOM).
Lotharmeyerite from the Ojuela Mine -
Image
Back to Minerals