Image: <bdi><a href="https://www.wikidata.org/wiki/Q56247090" class="extiw" title="d:Q56247090"><span title="mineral collector and dealer">Robert M. Lavinsky</span></a></bdi> (CC BY-SA 3.0)
monocliniccommonsilicates (zeolite group)
Heulandite
(Ca,Na)2-3Al3(Al,Si)2Si13O36·12H2O
This image displays a cluster of salmon-pink to orange-pink Heulandite crystals, exhibiting a tabular habit and translucent clarity. The crystals show a vitreous to pearly luster on their faces.
Heulandite Physical Properties
Mohs Hardness
3.5Crystal System
monoclinicLuster
vitreousStreak Color
whiteCleavage
perfect on {010}Fracture
unevenSpecific Gravity
2.2Colors
white, pink, red, orange, brown, yellow, greenTransparency
transparent to translucentType Locality
Aurangabad District, Maharashtra, IndiaMineral Group
silicates (zeolite group)Uses
collector, some industrial applications (adsorbent, catalyst)Associated Minerals
stilbite, apophyllite, scolecite, laumontite, quartz, calcite, celadoniteRarity
commonGeological Context
Heulandite typically forms in the vesicles and cavities of basaltic volcanic rocks, often as a secondary mineral. It can also be found in some metamorphic rocks and hydrothermal veins, commonly associated with the Deccan Traps basalts in India.
