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Mineral group · Silicate

Stilbite

NaCa₄(Al₉Si₂₇)O₇₂·nH₂O

Sheaf-like zeolite — stilbite-Ca and stilbite-Na.

Hardness3.5–4
Crystal systemMonoclinic
ClassSilicate
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Stilbite specimen

Stilbite-Ca Locality: Jalgaon District, Maharashtra, India (Locality at mindat.org) Size: cabinet, 14.7 x 7.5 x 6.6 cm Stilbite A bed of white chalcedony acts a — Photo: Robert M. Lavinsky · CC BY-SA 3.0

Stilbite

A zeolite series — split into stilbite-Ca and stilbite-Na in 1997 — famous for pearly sheaf-shaped crystal clusters.

Intro adapted from Wikipedia (CC BY-SA).

Stilbite is a mineral group, with the chemical formula NaCa₄(Al₉Si₂₇)O₇₂·nH₂O.

It crystallizes in the monoclinic crystal system.

Key properties: Mohs hardness 3.5–4; typically white or pink or orange or brown.

Collections: Collector Favorites.

Index entry. This entry combines official IMA/RRUFF species data with published physical-property data and a Wikipedia introduction — a full written entry hasn’t been published yet. Browse more S minerals or help write this entry.