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STILBITE is one of the most popular zeolite mineral for collectors. This specimen is from the Thomaston Dam in Thomaston, Connecticut, USA. Stilbite commonly forms nice crystals inside the frozen air bubbles (called vesicles) of volcanic rocks that have undergone a small amount of metamorphism. I picked up this fine piece in a trade with the late Ed Piela, who collected it himself during construction before the dam was completed in 1960. This piece comes out of my own collection.
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