a variety of zeolite (now regarded as identical to mesotype).

A variety of Natrolite, white or red in colour, occurring massive, or in prisms, in southern Norway.

The principal member of the zeolite group of minerals, which usually occurs as slender crystals or fibrous masses and is used in water softeners.

Mineralogy. A siliceous mineral subsequently identified with natrolite. Obsolete.

Natrolite, as found in certain parts of Norway.

= natrolite, n.