Chabazite-Mg
Chabazite (UK: ) is a tectosilicate mineral series in the zeolite group, closely related to gmelinite, with the chemical formula M[Al2Si4O12]·6H2O, where M is one or more metal cations. Recognized minerals in the series include Chabazite-Ca, Chabazite-K, Chabazite-Na, and Chabazite-Sr, depending on the prominence of the indicated cation. Chabazite crystallizes in the triclinic crystal system with typically rhombohedral shaped crystals that are pseudo-cubic. The crystals are typically twinned, and both contact twinning and penetration twinning may be observed.
Intro adapted from Wikipedia (CC BY-SA).
Chabazite-Mg is an IMA-recognized mineral species in the silicate class, with the chemical formula (Mg₀.₇K₀.₅Ca₀.₅Na₀.₁)[Al₃Si₉O₂₄]·10H₂O.
It crystallizes in the hexagonal crystal system (space group R-3). It is a member of the Chabazite structural group.
Key properties: Mohs hardness 4; specific gravity 1.98; White streak; Strongly vitreous luster; optically uniaxial.
IMA symbol Cbz-Mg, IMA status: approved, named in 2009.
Found in cavities in basalt, formed by hydrothermal alteration of feldspar and volcanic glass in a closed system with Mg-rich solutions.
It is found associated with Saponite, aragonite, phillipsite.
Its name comes from the Greek chabazios, an ancient name of a stone. A suffix indicates the most abundant extra-framework cation.