| 6hlkmnr ((BYSSOLITE)), $20 MINIMUM BID, Keystone Trap Rock Quarry, Cornog, Wallace Township, Chester County, Pennsylvania, 8 x 5 x 5 cm, Cabinet, | |
 | Here a classic Cornog, Keystone Trap Rock Byssolite that looks like a brillo pad. ex Rick Hafer collection. |
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