natrolite

Several varieties of natrolite have been distinguished by special names.

Natrolite is a tectosilicate mineral species belonging to the zeolite group.

From the Greek mesos, "middle", as its composition lies between natrolite and scolecite.

Natrolite is readily distinguished from other fibrous zeolites by its optical characteristics.

Natrolite is usually white or colorless, but sometimes reddish or yellowish.

The structure of the aluminosilicate framework is the same for scolecite, natrolite and mesolite.

Nepheline generally shows partial alteration into natrolite and cancrinite.

It was named natrolite by Martin Heinrich Klaproth in 1803.

Some of the water sites in the disordered natrolite structure of gonnardite are empty.

Fargite is a red natrolite from Glenfarg in Perthshire.

It occurs with natrolite in alkali pegmatites.

It is a member of the zeolite group and is closely related to natrolite which it also resembles in appearance.

Frequently associated minerals include: natrolite, neptunite, joaquinite, serpentine and albite.

Here are included natrolite, stilbite, analcime, chabazite, thomsonite, heulandite, and others.

Commonly found as zoned prisms or aggregates with thomsonite, natrolite and paranatrolite.

Natrolite occurs with other zeolites in the amygdaloidal cavities of basaltic igneous rocks.

It is associated with other minerals typical of undersaturated environments, namely leucite, cancrinite and natrolite.

Gonnardite is a comparatively rare, fibrous zeolite, natrolite subgroup.

The crystals are frequently epitaxial overgrowths of natrolite, mesolite, and gonnardite in various orders.

Gonnardite has the same framework structure as natrolite, but a disordered Si, Al distribution on the tetrahedral sites.

Bultfonteinite has been found in association with afwillite, apophyllite, calcite, natrolite, oyelite, scawtite, and xonotlite.

Scolecite, like natrolite and mesolite, usually occurs as acicular (needle-like) and fibrous aggregations.

Some of the more common mineral zeolites are analcime, chabazite, clinoptilolite, heulandite, natrolite, phillipsite, and stilbite.

An example mineral formula is: NaAlSiO 2HO, the formula for natrolite.

(Natrolite, NaAlSiO.2HO, does not directly form epitaxial overgrowths on scolecite).