8.6" Heulandite, Apophyllite and Stilbite on Mordenite - Composite

This is a composite association of peach colored stilbite, pink orange heulandite and green zoned apophyllite crystals on a bed of natural mordenite. The crystals from the association, as well as the matrix are all from Maharashtra, India.

The apophyllite and stilbite crystals have been mounted to the moredenite encrusted cavity and there is a repaired crack that runs through the specimen. If this was an entirely natural association the price would be many times higher.

This specimen comes from the Deccan Traps (a large igneous province and one of the largest volcanic features on earth) in the Pune Province of India. In the course of quarrying for other materials or digging wells sometimes large pockets of zeolites and other minerals are unearthed in the volcanic rock.

Stilbite is probably the most common zeolite found in these 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. Apophyllite while not a zeolite itself is almost always found associated with zeolites in the same pockets. It has two crystal habits, a rectangular prism capped by a steep four sided pyramid or a pseudo-cubic structure. While not a well known mineral to the general public it is popular among mineral collectors due to it's pastel colors and beautiful crystal formations.

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.

Heulandite, Apohyllite, Stilbite & Mordenite
Maharashtra, India
8.6 x 6 x 5"