Heulandite Subgroup from Prince William County, Virginia, USA
USA | |
| Luetcke, Rolf (n.d.) Personal communication. |
| Dietrich, R. V. (1990) Minerals of Virginia. Virginia Geological Survey. |
USA | |
| Luetcke, Rolf (n.d.) Personal communication. |
| Dietrich, R. V. (1990) Minerals of Virginia. Virginia Geological Survey. |
Millbrook Quarry, Haymarket, Prince William County, Virginia, USA