Dolomite limestone is the rock formation in which they are found. This rock was buried ages ago. Subsequently, surface water containing silicon seeped downward through the earth and was trapped in pockets or cavities in the dolomite rock. Under tremendous heat and pressure these crystals were formed. Weathering and erosion by glaciers and water have exposed the strata in Middleville, New York. the crystals are found mostly in rock cavities (formed approximately four hundred million years ago) but many are found in soil surrounding the weathered rocks.
They are world reknown as they are the only crystals to 'free-form' within a pocket, thus having a point at each end. (most gems need to be cut to acheive these points.)
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I was looking into that location recently so as to take my daughters on a mineral hunting expedition. Interesting to see your shot of the quartz double-terminated crystal "diamonds."
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