2.7" Red-Orange Heulandite Crystal Cluster - Maharashtra, India

This is a 2.7" wide cluster of the zeolite heulandite collected from the Deccan Traps (the world largest basalt flow) in Maharashtra, India. The specimen features aggregations of colorless heulandite within cavities in the basalt, with areas of vibrant red-orange coloration. A partial stilbite crystal can be found along one edge of this specimen.

Heulandite is a mineral of the zeolite group that also fits within the silicate and tectosilicates groups. It has the general chemical formula (Ca,Na)2-3Al3(Al,Si)2Si13O36 · 12H2O, however the calcium and sodium can be subsituted by potassium, barium and strontium ions. Heulandite crystals will often form as distinctive tabular, radiating crystals with a vitreous luster, of which can display a variety of colors including white, green, brown, orange, red, pink, yellow, grey and black.

Stilbite is a tectosilicate mineral of the zeolite group that is commonly found in zeolite deposits. Crystals often form flowery, bowtie or hourglass shaped structures and come in a variety of colors. Some of the most beautiful colorations are the pink or peach tints.

Heulandite & Stilbite
Maharashtra, India
Entire specimen: 2.7 x 2"