Calcite from
USA | |
| The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
| Mr. Scott Williams (self-collected). |
| The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
Zeitner (1956), Midwest Gem Trails | |
| The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
| The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
| Bill Morgenstern |
Schwaberer Quarry, Nehawka, Cass County, Nebraska, USA