Stilbite
Sodium Calcium Aluminum Silicate Hydrate, NaCa2Al5Si13O36.14H2O
Crystal System: Monoclinic
Hardness: 3.5-4
Density: 2.1

Stilbite is a widespread member of the zeolite group that is most commonly found in vesticles and cavities in lavas, especially basalt, and more rarely as lithoclases in metamorphic rocks. Stibite is associated with calcite, heulandite and other zeolites,

Stilbite occurs as transparent to translucent prismatic crystals, often in sheaf-like aggregates of twinned crystals. It also occurs as pseudo-orthorhombic crystals and as fibrous, radiating masses. It varies in color from white, grey, yellowish or reddish-brown.

Rocks from WSU Thomas Edison Mineral Collection

Index of Specimen Images

Table of Contents

bkeller@rockhounds.com 7/3/95