Martinite

martinite

(Na,☐,Ca)₁₂Ca₄(Si,S,B)₁₄B₂O₃₈(OH,Cl)₂F₂·4H₂OChemical formula

TriclinicCrystal system

4.0Mohs hardness

Facts

Chemical formula: (Na,☐,Ca)₁₂Ca₄(Si,S,B)₁₄B₂O₃₈(OH,Cl)₂F₂·4H₂O
Crystal system: Triclinic
Mohs hardness: 4.0
Elements in formula: Sodium, Calcium, Silicon, Sulfur, Boron, Oxygen, Hydrogen, Chlorine, Fluorine
Number of elements: 9
IMA status: Approved
Type locality: Poudrette quarry
Named after: Robert F. Martin