Dear sirs,
Thanks for suggestion.
This mineral is from the High P/T belt. Based on the high Potassium content,
it sounds like zeolite group mineral. However, there are two doubtful
points. First, the birefringence is higher than that of zeolite. Second, the
temperature of this belt is 350-400C.
I am going to use Laser Raman first to distinguish them from mica. Then
X-ray mapping is needed to check the mineral shape.
best wishes.
Rong Liu
Earth and Planetary Sciences,
Tokyo Insititute of Technology,
O-okayama 2-12-1, Meguro, Tokyo 152-8551, Japan
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