| 5hlkmis ((ADULARIA, BYSSOLITE)), $5 MINIMUM BID, Keystone Trap Rock Quarry, Chester County, Pennsylvania, 2.5 x 1.5 x 1.5 cm, Thumbnail, | |
 | Here is a cluster of twinned Adularia crystals from the classic Pennsylvanian locality, now a flooded quarry hole. Also present is hair like Byssolite. |
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