Tags: Chemical Substance, Mineral.
Harmotome is a mineral one of the rarer zeolites; a hydrated barium silicate with formula: (Ba0.5Ca0.5NaK)5Al5Si11O32·12(H2O). It forms vitreous white well defined monoclinic crystals often associated with calcite and other zeolites. It has a Mohs hardness of 4 to 5 and a specific gravity of 2.44 to 2.5.
