| 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 Beecher No. 3, Beecher Lode, Custer, Custer Mining District, Custer County, South Dakota, USA |
| Data Identifiers |
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| Mindat Occurrence Record ID: | 384199 |
| Long-form Identifier: | 1:3:384199:0 |
| GUID (UUID V4): | 0 |
| Nearest other occurrences of Sillimanite |
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| 1.8km (1.1 miles) | ⓘHot Shot mine, Custer, Custer Mining District, Custer County, South Dakota, USA |
| 1.9km (1.2 miles) | ⓘSouthern Black Hills Kyanite Mine, Southern Black Hills, Custer County, South Dakota, USA |
| 2.0km (1.3 miles) | ⓘElkhorn Mine (Tinsley Mine), Custer, Custer Mining District, Custer County, South Dakota, USA |
| 2.7km (1.7 miles) | ⓘMica King Mine (Lost Bonanza; Cook Mine), Custer Mining District, Custer County, South Dakota, USA |
| 5.8km (3.6 miles) | ⓘCuster Mountain lode (Snookum mine), Custer, Custer Mining District, Custer County, South Dakota, USA |
| 7.2km (4.5 miles) | ⓘHofert Arcade (Victory No. 1 Prospect), Custer Mining District, Custer County, South Dakota, USA |
| 7.8km (4.8 miles) | ⓘVictory Mine, Custer, Custer Mining District, Custer County, South Dakota, USA |
| 9.3km (5.8 miles) | ⓘBuster lode (Buster Dike Mica Mine), Custer, Custer Mining District, Custer County, South Dakota, USA |
| 9.4km (5.8 miles) | ⓘSilver Dollar Mine, Custer Mining District, Custer County, South Dakota, USA |
| 9.8km (6.1 miles) | ⓘRuby Reef Claims (Ruby Reef; Ruby Reef No. 1), Custer Mining District, Custer County, South Dakota, USA |
| References |
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