Tremolite from West Marlboro Township, Chester County, Pennsylvania, USA
USA | |
| The Minerology of Pennsylvania Samual Gordon, pgs. 189 |
Mineralogy of Pennsylvania-1922 Samuel S. Gordon, pg. 180 | |
| Dana 6: 1067. |
USA | |
| The Minerology of Pennsylvania Samual Gordon, pgs. 189 |
Mineralogy of Pennsylvania-1922 Samuel S. Gordon, pg. 180 | |
| Dana 6: 1067. |