| Locality type: | Peak |
| Classification |
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| Species: | 'Hornblende Root Name Group' (not an IMA approved species) |
| Formula: | ◻Ca2(C42+C3+)(AlSi7O22)W2 |
| Confirmation |
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| Validity: | Believed Valid |
| Data |
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| Mineral Data: | Click here to view Hornblende Root Name Group data |
| Locality Data: | Click here to view Twin Peaks, Lead Mining District, Lawrence County, South Dakota, USA |
| Data Identifiers |
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| Mindat Occurrence Record ID: | 384164 |
| Long-form Identifier: | 1:3:384164:8 |
| GUID (UUID V4): | 0 |
| Nearest other occurrences of Hornblende Root Name Group |
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| 13.4km (8.3 miles) | ⓘBear Town, Lawrence County, South Dakota, USA |
| 47.0km (29.2 miles) | ⓘBull Hill nepheline-syenite deposit (Bull Hill carbonatite; Bear Lodge carbonatite), Bear Lodge alkaline igneous complex, Crook County, Wyoming, USA |
| 53.7km (33.4 miles) | ⓘGreen Granite quarry, McGees Station, Pennington County, South Dakota, USA |
| 62.9km (39.1 miles) | ⓘBismark-Ida Florence Groups, Keystone Gold Mining District, Pennington County, South Dakota, USA |
| 63.2km (39.3 miles) | ⓘEgyptian Group, Keystone Gold Mining District, Pennington County, South Dakota, USA |
| 63.3km (39.3 miles) | ⓘNathaniel Pope, Keystone Gold Mining District, Pennington County, South Dakota, USA |
| 64.1km (39.8 miles) | ⓘColumbia Mine (Maiden Mine), Keystone, Keystone Gold Mining District, Pennington County, South Dakota, USA |
| 66.0km (41.0 miles) | ⓘEdison Mine, Keystone, Keystone Mining District, Pennington County, South Dakota, USA |
| 71.3km (44.3 miles) | ⓘKeystone Lode Occurrence, Custer Mining District, Custer County, South Dakota, USA |
| 74.5km (46.3 miles) | ⓘHelen Beryl Mine, Fourmile, Custer Mining District, Custer County, South Dakota, USA |
| References |
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