| 06hlkmis ((BYSSOLITE)), $10 MINIMUM BID, Keystone, Trap Rock Quarry, Cornog, Chester County, Pennsylvania, 4 x 3 x 1.5 cm, Miniature, | |
 | Here is a old specimen from a defunct locality of a quarry filled with water. It is also a classic Pennsylvanian locality. This specimen is a mass of hairlike grey green Byssolite. It has some small areas of brownish, rustly coloration from the iron oxide breakdown of a Pyrite in that area pseudomorphing to Geothite. |
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