9.2" Apophyllite, Stilbite and Heulandite on Chalcedony - India

 
 
 
 
 
 
 
 
This is a gorgeous association of colorless apophyllite, peach stilbite and large heulandite crystals that formed over a chalcedony encrusted matrix. Each crystal has some red-orange coloration to their exteriors, possibly a result of iron oxidation. This mineral association was collected from the Deccan Traps (the world largest basalt flow) in Maharashtra, India. Comes with an acrylic display stand.

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.

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.

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 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.
FOR SALE
$745
DETAILS
SPECIES
Apophyllite, Stilbite, Heulandite & Chalcedony
LOCATION
Maharashtra, India
SIZE
9.2 x 6.5"
CATEGORY
SUB CATEGORY
ITEM
#173180