[Rockhounds] Blue green apophyllite

[Rock Currier]

Lary,

It is very unlikely that the apophyllite crystals are growing on natrolite. 
When I first went to India they called anything thin, white and prismatic 
natrolite. None of the many, many specimens of white prismatic minerals I 
encountered ever turned out to be natrolite. Also none of the mamillary or 
stalactitic material was ever identified as natrolite either. To the best of 
my knowledge there has never been a confirmed find of natrolite in India 
except in one specimen and the natrolite was confirmed optically to be 
located in the center of a small prismatic mesolite crystal from the quarry 
the runners called Malad to the north of Bombay. You might want to ask you 
supplier who did the analysis of the specimens and then contact them to 
determine what tests they ran. Also the locality for the apophyllite is not 
likely to be Jalgaon. Jalgaon is a sizeable city and most of the specimens 
attributed to that city actually come from quarries some miles to the west 
of there near a village called Paldi.

Rock



I recently got a dozen pieces of an unusual blue-green variety of
Apophyllite. Although these are from Jalgoan, India, they do not look at all
like the usual blocky form of Apophyllite from there. These are different in
color, and are arranged in a parallel habit, with the prism being elongated
and frequently twinned. Apparently they never occur as single crystals.The
matrix (Natrolite) is mamillary and stalagmatitic.