What is Cabalzarite?
Cabalzarite is a rare hydrated calcium magnesium arsenate of the tsumcorite group, known for salmon-pink to orange-brown crystals.
Mineralogy and structure
The reference formula is CaMg2(AsO4)2·2H2O. Cabalzarite belongs to the arsenates and crystallises in the monoclinic system. Its monoclinic structure contains arsenate groups and hydrated cation sites. Minor aluminium and ferric iron may replace magnesium, so the ideal formula is a reference end member rather than a guarantee of every analysis.
Colour and appearance
Typical colours include light brown, salmon-pink and orange-brown. For small or complex mineral species, crystal size, transparency, lustre and matrix association are often more diagnostic than colour alone.
Formation and localities
Cabalzarite forms in or is associated with arsenic-rich hydrothermal veins and oxidised parts of polymetallic deposits. Important documented localities include Falotta in Switzerland, Italy, Morocco and other arsenic-rich localities. A precise mine or geological setting is preferable to a broad country label when it is known.
Collecting and care
Cabalzarite is best treated as a labelled reference or collector specimen. Protect fragile crystals from impact and humidity changes. Arsenic-, cadmium-, lead-, thorium- and selenium-bearing minerals should not be cut, ground or used in jewellery; wash hands after handling and keep them away from food and children.
