| Locality type: | Mine |
| 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 |
| 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 Reynolds Mine (Beryl Hill Mine), Royalston, Worcester County, Massachusetts, USA |
| Data Identifiers |
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| Mindat Occurrence Record ID: | 238237 |
| Long-form Identifier: | 1:3:238237:1 |
| GUID (UUID V4): | 0 |
| Nearest other occurrences of Biotite |
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| 6.6km (4.1 miles) | ⓘSouth Royalston beryl locality (Clark locality), Royalston, Worcester County, Massachusetts, USA |
| 7.3km (4.5 miles) | ⓘWebb Granite Quarry, Fitzwilliam, Cheshire County, New Hampshire, USA |
| 8.7km (5.4 miles) | ⓘSilver White Granite Quarry, Fitzwilliam, Cheshire County, New Hampshire, USA |
| 9.1km (5.7 miles) | ⓘSnow Flake Granite Quarry, Fitzwilliam, Cheshire County, New Hampshire, USA |
| 15.5km (9.6 miles) | ⓘOrange mica mine, Orange, Franklin County, Massachusetts, USA |
| 19.2km (11.9 miles) | ⓘMonadnock Mountain, Jaffrey, Cheshire County, New Hampshire, USA |
| 23.1km (14.3 miles) | ⓘPiper graphite mine (Piper black-lead mine), Northfield, Franklin County, Massachusetts, USA |
| 30.1km (18.7 miles) | ⓘRollstone Hill Quarries, Fitchburg, Worcester County, Massachusetts, USA |
| 32.6km (20.2 miles) | ⓘMcDonald Quarry, Mason, Hillsborough County, New Hampshire, USA |
| 32.6km (20.2 miles) | ⓘBarker Hill Quarry (Rusk Quarry; Townsend Quarry), Townsend, Middlesex County, Massachusetts, USA |
| References |
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