mineral

Orange stilbite (zeolite) crystal cluster

Stilbite-Ca, hydrated calcium sodium aluminosilicate; approximately (Na,Ca)₉(Si₃₀Al₆)O₇₂·28H₂O

AI-generated identification · may be incorrect

Typically peach, orange, or salmon; pearly to vitreous luster; Mohs hardness 3.5–4; monoclinic crystal structure with prominent cleavage and commonly radiating sheaf or bow-tie aggregates. The specimen appears partly coated or attached to a yellow tag, so exact identification is visual only.

Identified August 23, 2026More mineral →

Explore Orange stilbite (zeolite) crystal cluster in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Forms as a low-temperature hydrothermal mineral lining cavities and vesicles in basalt and other volcanic rocks, often with apophyllite, calcite, or other zeolites. Deposits commonly formed during alteration of relatively young volcanic rocks, especially in India’s Deccan Traps.

Uses & applications

Primarily a mineral-collecting and display specimen; too soft and hydrated for most jewelry or industrial construction use. Attractive clusters may be mounted in cabinets or used educationally.

Geological facts

Stilbite is a zeolite capable of exchanging water and certain ions within its open aluminosilicate framework. Its delicate fan-shaped crystals are especially characteristic of Indian specimens.

Field identification & locations

Identify by peach-orange color, pearly sheen, softness, excellent cleavage, and radiating sheaf-like crystals; avoid water and abrasion. Common localities include Maharashtra and Gujarat, India, Iceland, Scotland, and New Jersey.