Heulandite
Image: Robert M. Lavinsky (CC BY-SA 3.0)
Mineral NameHeulandite
Chemical Formula(Ca,Na)2-3Al3(Al,Si)2Si13O36·12H2O
Mohs Hardness3.5
Crystal Systemmonoclinic
Lustervitreous
Streak Colorwhite
Cleavageperfect on {010}
Fractureuneven
Specific Gravity2.2
Colorswhite, pink, red, orange, brown, yellow, green
Transparencytransparent to translucent
Type LocalityAurangabad District, Maharashtra, India
Mineral Groupsilicates (zeolite group)
Usescollector, some industrial applications (adsorbent, catalyst)
Associated Mineralsstilbite, apophyllite, scolecite, laumontite, quartz, calcite, celadonite
Raritycommon
Description
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.
Geological 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.
