| Locality | Latitude | Longitude | Distance | Bearing |
|---|
| Nashua, Chickasaw County, Iowa, USA | 42° 57' 7" N | 92° 32' 19" W | 0.2km (0.1 miles) | |
| Occurrence (MRDS 10081990), Bremer County, Iowa, USA | 42° 46' 6" N | 92° 29' 58" W | 20.7km (12.9 miles) | |
| Waverly, Bremer County, Iowa, USA | 42° 43' 37" N | 92° 28' 0" W | 25.7km (16.0 miles) | |
| Shell Rock, Butler County, Iowa, USA | 42° 42' 36" N | 92° 34' 58" W | 27.2km (16.9 miles) | |
| Rockford Pit, Floyd County, Iowa, USA | 43° 2' 30" N | 92° 56' 56" W | 35.0km (21.7 miles) | |
| Aplington quarry, Butler County, Iowa, USA | 42° 35' 16" N | 92° 53' 7" W | 49.6km (30.8 miles) | |
| Fairbank Quarry, Fayette County, Iowa, USA | 42° 39' 51" N | 92° 2' 3" W | 52.0km (32.3 miles) | |
| Turner Creek Occurrence, Fayette County, Iowa, USA | 42° 58' 50" N | 91° 52' 50" W | 53.4km (33.2 miles) | |
| Vernon Springs, Howard County, Iowa, USA | 43° 20' 59" N | 92° 8' 17" W | 54.7km (34.0 miles) | |
| Spillville area, Winneshiek County, Iowa, USA | 43° 12' 17" N | 91° 57' 3" W | 55.2km (34.3 miles) | |
| Sheffield, Franklin County, Iowa, USA | 42° 53' 39" N | 93° 12' 42" W | 55.4km (34.4 miles) | |
| Chapin, Franklin County, Iowa, USA | 42° 49' 56" N | 93° 12' 11" W | 56.0km (34.8 miles) | |
| Cresco area, Howard County, Iowa, USA | 43° 22' 15" N | 92° 6' 50" W | 57.8km (35.9 miles) | |
| West Union, Fayette County, Iowa, USA | 42° 57' 45" N | 91° 48' 29" W | 59.3km (36.8 miles) | |
| Pint's Quarry, Raymond, Black Hawk County, Iowa, USA | 42° 28' 19" N | 92° 12' 57" W | 59.5km (37.0 miles) | |
| Raymond, Black Hawk County, Iowa, USA | 42° 28' 7" N | 92° 13' 12" W | 59.7km (37.1 miles) | |
| Mason City clay pits, Cerro Gordo County, Iowa, USA | 43° 8' 41" N | 93° 13' 59" W | 60.5km (37.6 miles) | |
| Fayette, Fayette County, Iowa, USA | 42° 50' 39" N | 91° 48' 1" W | 61.2km (38.0 miles) | |
| Peske Quarry, Raymond, Black Hawk County, Iowa, USA | 42° 27' 32" N | 92° 11' 47" W | 61.5km (38.2 miles) | |
| Waterloo South mine, Black Hawk County, Iowa, USA | 42° 24' 43" N | 92° 20' 30" W | 62.2km (38.6 miles) | |
| Littleton area, Buchanan County, Iowa, USA | 42° 32' 1" N | 92° 1' 36" W | 62.5km (38.8 miles) | |
| Jesup, Buchanan County, Iowa, USA | 42° 28' 29" N | 92° 3' 48" W | 65.7km (40.8 miles) | |
| H Jones Mine Reserve (Hugh M. Jones Estate), Fillmore County, Minnesota, USA | 43° 32' 2" N | 92° 14' 38" W | 68.8km (42.8 miles) | |
| Watson Mine (G. Watson; Hanna Mining Company Agt), Fillmore County, Minnesota, USA | 43° 32' 45" N | 92° 16' 27" W | 69.3km (43.1 miles) | |
| Waterloo South Quarry, Black Hawk County, Iowa, USA | 42° 21' 17" N | 92° 17' 49" W | 69.3km (43.1 miles) | |
| Hovey Reserve Mine (K. K. Hovey), Fillmore County, Minnesota, USA | 43° 32' 31" N | 92° 14' 48" W | 69.6km (43.3 miles) | |
| A. Ramaker (Ramaker Mine), Fillmore County, Minnesota, USA | 43° 32' 57" N | 92° 16' 0" W | 69.8km (43.4 miles) | |
| Bjortomt Mine (I. Bjortomt), Fillmore County, Minnesota, USA | 43° 32' 44" N | 92° 15' 6" W | 69.9km (43.4 miles) | |
| Love Mine (Robert Love; Hanna Mining Company Agt), Fillmore County, Minnesota, USA | 43° 33' 1" N | 92° 15' 30" W | 70.1km (43.6 miles) | |
| Hendrickson Mine (Hanna Mining Company Agt; Nordahl Hendrickson), Fillmore County, Minnesota, USA | 43° 33' 14" N | 92° 16' 9" W | 70.3km (43.7 miles) | |
