Amethyst from Howard County, Maryland, USA
USA | |
| Mines of the Washington D.C Area |
Mineralogical Record (1990) 21:203-213 Minerals of the Washington, D.C. Area | |
| Mineralogical Record (1990) 21:203-213 |
USA | |
| Mines of the Washington D.C Area |
Mineralogical Record (1990) 21:203-213 Minerals of the Washington, D.C. Area | |
| Mineralogical Record (1990) 21:203-213 |