This Specimen has been sold.
3.1" Red-Orange Heulandite Crystal Cluster - Maharashtra, India
This is a 3.1" 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.
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.
Entire specimen: 3.1 x 1.9"