Natrolite

UNB-2016-0425Minerals » Tectosilicates » Zeolite

Description

Three radial compact white Natrolite samples with a vitreous lustre. Natrolite (Na2Al2Si3O10 x 2H2O) can be white, colourless, greyish, yellowish or reddish in colour. Lustre is vitreous or silky and streak is colourless. Hardness is 5 to 5 1/2 and cleavage is perfect in one direction. Natrolite usually occurs as slender to acicular crystals but can also be radial, granular, compact. Usually found as radiating crystals in the cavities of volcanic rocks.

Specifications

Object name	Natrolite
ID	UNB-2016-0425
Legal status	Permanent collection
Category	Mineral
Classification	Mineral group: Tectosilicates Sub-group: Zeolite
Composition	(MAlO2)(SiO 2)x(H2O)y
Origin	Margaretville, New York, U.S.A.
Pieces	3
Partial	No
Measurements	4.7cm x 2.1cm x 1.9cm 4.3cm x 2.2cm x 1.4cm 5.5cm x 1.8cm x 2.1cm

Map of Origin

Publications

Chesterman, C.W. 1979. Audubon Society, Field Guide to North American Rocks and Minerals. Knopf.