| Locality type: | Area |
| Classification |
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| Species: | Sillimanite |
| Formula: | Al2(SiO4)O |
| Confirmation |
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| Validity: | Believed Valid |
| Data |
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| Mineral Data: | Click here to view Sillimanite data |
| Locality Data: | Click here to view Horsetooth Mountain Area, Larimer County, Colorado, USA |
| Data Identifiers |
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| Mindat Occurrence Record ID: | 493199 |
| Long-form Identifier: | 1:3:493199:7 |
| GUID (UUID V4): | 0 |
| Nearest other occurrences of Sillimanite |
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| 15.6km (9.7 miles) | ⓘWisdom Ranch Prospect, Crystal Mountain Pegmatite Mining District (Storm Mountain Mining District), Larimer County, Colorado, USA |
| 67.5km (41.9 miles) | ⓘWheeler Basin, Grand County, Colorado, USA |
| 80.9km (50.3 miles) | ⓘMedicine Bow Mountains, Jackson County, Colorado, USA |
| 83.9km (52.2 miles) | ⓘGuy Hill pegmatite area, Jefferson County, Colorado, USA |
| 84.8km (52.7 miles) | ⓘBonanza, Central City Mining District (Central Mining District), Gilpin County, Colorado, USA |
| 85.8km (53.3 miles) | ⓘLadwig Group (Ladwig No. 2; Ladwig No. 3; Claims: Ladwig No. 1), Ralston Buttes Mining District, Jefferson County, Colorado, USA |
| 88.5km (55.0 miles) | ⓘVigilant; Banta Hill; Gold; Bunkhouse Occurrence, Idaho Springs Mining District (Virginia Mining District), Clear Creek County, Colorado, USA |
| 89.3km (55.5 miles) | ⓘOld Town Shaft, Central City Mining District (Central Mining District), Gilpin County, Colorado, USA |
| 90.3km (56.1 miles) | ⓘAjax Mica Mine (Floyd Hill Mica Mine), Clear Creek Pegmatite Province, Clear Creek County, Colorado, USA |
| 92.0km (57.2 miles) | ⓘJennie Lind Tunnel No. 1, Idaho Springs, Lawson Mining District, Clear Creek County, Colorado, USA |
| References |
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