Acmite on Natrolite
- Acmite (Aegerine)
Sodium Iron Silicate, NaFeSi2O6
Crystal System: Monoclinic
- Acmite is a rock-forming mineral of the pyroxene group. It occurs primarily as a product of late
crystalization of alkaline magmas. "Aegerine" is a field term used to describe pyroxenes or rocks
bearing pyroxene with a large acmite component.
Sodium Aluminum Silicate Hydrate, Na2Al2Si3O10.2H2O
Crystal System: Orthorhombic
- Natrolite is a member of the zeolite group. It occurs as slender, prismatic crystals with vertical
striations, usually as globular aggregates of fibrous, radiating needles. It ranges in color from
white, pink, yellowish or transparent. It is found lining cavities in basalts and other lavas and is
associated with calcite and zeolites. Natrolite sometimes fluoresces orange in ultraviolet light.
Rocks from Martin Friedlander's Collection
Index of Specimen Images
Table of Contents