| Locality type: | Quarry |
| Classification |
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| Species: | 'Biotite' (not an IMA approved species) |
| Formula: | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Comments: | "The refractive indices are: α =1.640 β and γ = 1.645, and suggest siderophyllite." (Hitchen, 1935) |
| Habit: | usually not well crystallized |
| Colour: | black |
| Abundance at site: | Common |
| Confirmation |
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| Validity: | Believed Valid |
| Data |
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| Mineral Data: | Click here to view Biotite data |
| Locality Data: | Click here to view Rollstone Hill Quarries, Fitchburg, Worcester County, Massachusetts, USA |
| Data Identifiers |
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| Mindat Occurrence Record ID: | 127271 |
| Long-form Identifier: | 1:3:127271:0 |
| GUID (UUID V4): | 0 |
| Nearest other occurrences of Biotite |
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| 4.7km (2.9 miles) | ⓘRoute 13 area, Lunenburg, Worcester County, Massachusetts, USA |
| 6.1km (3.8 miles) | ⓘLeavitt Quarry, Leominster, Worcester County, Massachusetts, USA |
| 10.5km (6.5 miles) | ⓘPJ Keating Quarry (Lunenburg Quarry), Lunenburg, Worcester County, Massachusetts, USA |
| 14.2km (8.8 miles) | ⓘBarker Hill Quarry (Rusk Quarry; Townsend Quarry), Townsend, Middlesex County, Massachusetts, USA |
| 19.9km (12.4 miles) | ⓘMcDonald Quarry, Mason, Hillsborough County, New Hampshire, USA |
| 22.1km (13.7 miles) | ⓘQuabbin Aqueduct Shaft #2 locality, Holden, Worcester County, Massachusetts, USA |
| 24.0km (14.9 miles) | ⓘShaker Quarry, Groton, Middlesex County, Massachusetts, USA |
| 24.1km (15.0 miles) | ⓘComolli Granite Quarry, Milford, Hillsborough County, New Hampshire, USA |
| 24.7km (15.3 miles) | ⓘPine Hill, Bolton, Worcester County, Massachusetts, USA |
| 25.3km (15.7 miles) | ⓘBolton Lime Quarries (Bolton Quarry; Whitcomb Quarry; Hildreth Quarry), Bolton, Worcester County, Massachusetts, USA |
| References |
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Rollstone Hill Quarries, Fitchburg, Worcester County, Massachusetts, USA