| Locality type: | Mine |
| Classification |
|---|
|
| Species: | Sillimanite |
| Formula: | Al2(SiO4)O |
| Confirmation |
|---|
|
| Validity: | Believed Valid |
| Data |
|---|
|
| Mineral Data: | Click here to view Sillimanite data |
| Locality Data: | Click here to view Cotopaxi Mine (Cotopaxi lode; Gumaer Mine; Fannie lode; Fannie Mill), Mine Gulch, Cotopaxi, Cotopaxi Mining District, Fremont County, Colorado, USA |
| Data Identifiers |
|---|
|
| Mindat Occurrence Record ID: | 34977 |
| Long-form Identifier: | 1:3:34977:8 |
| GUID (UUID V4): | c0282796-c293-41df-a4da-037b7b736951 |
| Nearest other occurrences of Sillimanite |
|---|
|
|
| 0.2km (0.2 miles) | ⓘMine Gulch, Cotopaxi, Cotopaxi Mining District, Fremont County, Colorado, USA |
| 14.1km (8.7 miles) | ⓘDevil's Hole Mine, Fremont County, Colorado, USA |
| 14.4km (9.0 miles) | ⓘFive Points Gulch, Fremont County, Colorado, USA |
| 24.9km (15.5 miles) | ⓘCopper Girl (Copper Girl 1906; Patented Claims: Valley View), Copper Gulch Area, Grape Creek Mining District (Greenhorn Mining District), Fremont County, Colorado, USA |
| 26.6km (16.6 miles) | ⓘGreen Mountain Mine (Copper Boy Mine), Grape Creek Mining District (Greenhorn Mining District), Fremont County, Colorado, USA |
| 35.9km (22.3 miles) | ⓘCalumet Mine (Calumet; Calumet No. 2; Hecla; Hecla No. 2; Calumet Iron Mine; Calumet-Hecla-Smithville Magnetite deposit; Patented Placer claims: Calumet; Hecla-Williamson; Smithville No. 2; CF&I Company Mine), Turret Mining District, Chaffee County, Colorado, USA |
| 38.1km (23.7 miles) | ⓘWhopper Mine and Prospect, Micanite Mining District (Currant Creek Mining District), Fremont County, Colorado, USA |
| 38.1km (23.7 miles) | ⓘSedalia Mine (Sedalia Copper Mine), Sedalia Mining District, Chaffee County, Colorado, USA |
| 38.7km (24.0 miles) | ⓘAce High - Jackpot Prospect, Turret Mining District, Chaffee County, Colorado, USA |
| 39.0km (24.2 miles) | ⓘIndependence Mine, Turret Mining District, Chaffee County, Colorado, USA |
| References |
|---|
|
Spry, P. G., McFadden, S., Teale, G. S., Alers, B., Shallow, J. M., & Glenn, J. M. (2021). Nodular sillimanite rocks as field indicators to metamorphosed massive sulfide deposits. Ore Geology Reviews, 104632. |
