Rock Hill Quarry, Rock Hill, Bucks Co., Pennsylvania, USA
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The diabase in the Rock Hill Quarry was cut by numerous albite-actinolite veins. The fracture fillings in these veins were nearly always massive and coarsely crystalline. Most of the veins were less than 3 inches wide but thicker examples were occasionally seen.
In the late 1970’s a vein was exposed on an upper bench in the west end of the quarry, just off an access road, that contained open space over a length of several yards. The vein contained white asbestiform amphibole, probably tremolite, and dense, matted amphibole (mountain leather). Also present were very light yellowish green, almost white, prehnite and dark green sphene. The sphene crystals were sharp and of the typical habit but not elongated.
A few other mineral species have been reported from veins in this quarry. However, with the exception of the massive Ab-Act vein and the single sphene-bearing occurrence, secondary minerals were very sparse.
5 entries listed. 4 valid minerals.
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