| Locality type: | Mine |
| Classification |
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| Species: | Beryl |
| Formula: | Be3Al2(Si6O18) |
| Comments: | Occurs in pegmatite. |
| Confirmation |
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| Validity: | Believed Valid |
| Associated Minerals Based on Photo Data: |
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| Quartz | 7 |
| Schorl | 4 |
| Microcline | 3 |
| Muscovite | 3 |
| Fluorapatite | 1 |
| Albite | 1 |
| Data |
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| Mineral Data: | Click here to view Beryl data |
| Locality Data: | Click here to view Helen Beryl Mine, Fourmile, Custer Mining District, Custer County, South Dakota, USA |
| Photo Gallery | View Gallery (7 photos) |
| Data Identifiers |
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| Mindat Occurrence Record ID: | 68281 |
| Long-form Identifier: | 1:3:68281:3 |
| GUID (UUID V4): | 0 |
| Nearest other occurrences of Beryl |
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| 1.1km (0.7 miles) | ⓘBig Tom Mine (Kem Lode), Custer Mining District, Custer County, South Dakota, USA |
| 1.4km (0.8 miles) | ⓘEruption Lode (Volcano Lode), Custer Mining District, Custer County, South Dakota, USA |
| 1.4km (0.9 miles) | ⓘNew York Mine (Westinghouse No. 1 Mine), Custer, Custer Mining District, Custer County, South Dakota, USA |
| 1.8km (1.1 miles) | ⓘCorky Claim, Unorganized mining district [1], Custer County, South Dakota, USA |
| 1.9km (1.2 miles) | ⓘRainbow No. 4 Mine, Fourmile, Custer Mining District, Custer County, South Dakota, USA |
| 2.2km (1.4 miles) | ⓘTip Top Mine, Fourmile, Custer Mining District, Custer County, South Dakota, USA |
| 2.2km (1.4 miles) | ⓘTom Carroll Claim, Custer Mining District, Custer County, South Dakota, USA |
| 3.1km (1.9 miles) | ⓘRed Spar Mine, Unorganized mining district [1], Custer County, South Dakota, USA |
| 3.1km (1.9 miles) | ⓘLincoln No. 7 Lode Prospect, Custer Mining District, Custer County, South Dakota, USA |
| 3.2km (2.0 miles) | ⓘMichaud Prospect, Unorganized mining district [1], Custer County, South Dakota, USA |
| References |
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Meeves, H.; Harrer, C.M.; Salsbury, M.H.; Konselman, A.S; Shannon, S.S. Jnr. (1966) Reconnaissance of beryllium-bearing pegmatite deposits in six western states: Arizona, Colorado, New Mexico, South Dakota, Utah, and Wyoming. Bureau of Mines Information Circular 8298. United States Department of the Interior 34 pp.p.32 - (Table A-1) |
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Helen Beryl Mine, Fourmile, Custer Mining District, Custer County, South Dakota, USA