Distinct after {010}, indistinct after {100}, {101}, {120} and {110}
Fracture
Tenacity
Elastic-flexible
Point Group
monoclinic-prismatic - 2/m
Space Group
P21/c (14)
Habit
blocky, coarse, prismatic, Rhombohedron, tabular
Formation
(1) Hydrothermal formation in veins at low temperatures
(2) Volcanic formation through direct sublimation from volcanic gases (fumaroles)
(3) Secondary formation as a product of the transformation of other arsenic minerals in the oxidation zone of arsenic ore deposits
