Stilbite
Fun Fact: Stilbite is identifiable by a distinctive pearly lustre.
Introduction: Stilbite belongs to the zeolite group of minerals, identifiable by a distinctive pearly lustre, forming bowtie-shaped crystals or fan-like sprays. Stilbite comes from the Greek stilbein or 'to glitter or shine' or stilbe meaning 'mirror'. Another feature is its colour; white.
Distribution: Basalts that outcrop in the Grootberg Pass north of the Haub River, 90km east of Khorixas on the Sesfontein road are of a good quality
Composition: Silicate
Crystal system: Monoclinic and orthorhombic
Lustre: Pearly, vitreous
Streak: White
Hardness: 3.5-4
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