A member of the zeolite group of minerals occurring in a wide variety of sedimentary rocks and in some igneous rocks, as crystals of various…

A zeolite mineral originally regarded as a single species but later resolved into several distinct species, including natrolite, mesolite…

Hydrous silicate of aluminium and calcium, found in crystals which lose water when exposed to the air.

A mineral of the Zeolite group; a hydrated silicate of aluminium and calcium, found in crystals of various colours with pearly lustre.

A triclinic hydrous silicate of calcium occurring as minute needle- or blade-shaped crystals of a whitish colour in vesicles in eruptive rocks. Cf…

A synonym of okenite, n.

A zeolitic mineral, belonging to the hydrous silicates, white in colour, and of uneven fracture.

An orthorhombic hydrated silicate of aluminium, calcium, sodium, and potassium, which belongs to the zeolite group and usually occurs as white glassy…

A mineral of uncertain composition, supposed to be related to stilbite.

= analcime, n.

A mineral of the zeolite group which is a hydrated aluminosilicate of potassium and calcium and crystallizes in the trigonal system as colourless…

A zeolite, CaAl2Si7O18.7H2O, found as tabular orthorhombic crystals.

A hydrated aluminosilicate of calcium, CaAl2Si6O16.4H2O, that is a member of the zeolite group and occurs as colourless or white monoclinic crystals…

A hydrous silicate of calcium and aluminium, CaAl2Si4O12.2H2O, the calcium analogue of analcime, that occurs as colourless to white monoclinic…

A triclinic hydrous calcium silicate similar to okenite, from which it was distinguished by its optical and X-ray properties.