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Updated: June 12, 2025
They may be chipped from, as there are about thirty or forty of them exposed in each shaft, and the character of the minerals examined to see if anything but calcite is in it. This is ascertained by a drop of acid, as explained before, and by the descriptions given further on.
In all cases the original box work has been in thin sheets of calcite, and the heavy varieties are due to later deposits of calcite and aragonite crystals or, pop corn.
It was opened in the lower workings of a shaft of the Empire Zinc Company, and "The entire surface of the cave, top, sides and bottom, is lined with calcite crystals, so closely packed together as to form a continuous sheet and most of them of great size, and well formed faces. Scalenohedra as much as two feet long are sometimes seen, and others a foot or more in length are common.
It has puzzled many an observer that crystals occur in the earth with directions of their main axes entirely independent of the direction of the earthly pull of gravity. Plate VI shows the photograph of a cluster of Calcite crystals as an example of this phenomenon. It tells us that gravity can have no effect on the formation of the crystal itself.
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