Heulandite

UNB-2016-0435Minerals » Tectosilicates » Zeolite

Description

Seven samples of white, radiating aggregates of Heulandite. Heulandite ((Ca, Na)(Al2, Si7, O18) x 6H2O) can be white, greyish, colourless, greenish or red in colour. Lustre is vitreous but pearly on the cleavage and streak is colourless. Hardness is 3 1/2 to 4 and cleavage is perfect in one direction. Heulandite usually occurs as coffin-shaped crystals or tabular single crystals. Heulandite can also be radiating aggregates with nearly parallel crystals but can also be foliated, globular or granular.

Specifications

Object name	Heulandite
ID	UNB-2016-0435
Legal status	Permanent collection
Category	Mineral
Classification	Mineral group: Tectosilicates Sub-group: Zeolite
Composition	(MAlO2)(SiO 2)x(H2O)y
Origin	Herrington Cove, New Brunswick, Canada
Pieces	7
Partial	No
Measurements	8.9cm x 3.6cm x 2.7cm 5.1cm x 2.9cm x 1.7cm 4.7cm x 3.4cm x 2.5cm 4cm x 2.2cm x 2.3cm 7.6cm x 4cm x 2.2cm 3.8cm x 3.2cm x 1.8cm 5.7cm x 5.2cm x 2.3cm

Map of Origin

Publications

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