Heulandite

UNB-2016-0428Minerals » Tectosilicates » Zeolite

Description

Five samples of white coffin-shape Heulandite crystals with vitreous lustre and pearly along the cleavage. 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-2016-0428
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	5
Partial	No
Measurements	4.5cm x 6.7cm x 5.3cm 5.5cm x 3cm x 1.2cm 2.6cm x 1.6cm x 1.2cm 2.1cm x 1.5cm x 1cm 1.4cm x 1.5cm x 0.4cm

Map of Origin

Publications

McHone, J.G. and McHone, N.W., 2012, Grand Manan Geology: Excursions in Island Natural History: Stones2Gems Publications, Grand Manan, New Brunswick, 50 p.