| DESCRIPTION: | No. 75574 | 
| Mineral: | Calcite (contact-twinned crystals) | 
| Locality: | Roosevelt Avenue Quarry (York Stone Quarry), York, York County, Pennsylvania | 
| Description: | Large lustrous transparent-to-translucent golden-orange calcite crystals with silky surface luster caused by microscopic parallel crystal faces on the surfaces. The calcite crystals are contact-twinned with distinct twin plane running through the center. From my personal collection; collected ca. 1992 by Bryon Brookmyer. Featured in What's New in the Mineral World, Report #54, December 13, 2019 | 
| Overall Size: | 10x8x7 cm | 
| Crystals: | 5-75 mm | 
| Archived: | For reference only |