| 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 |
| Comments: | A component of the host rocks at Robert's Lode. |
| Quality for species: | Rock forming mineral/non-crystalline/little interest for collectors.(##) |
| Abundance at site: | Very 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 Great Hill cobalt mines, Cobalt, East Hampton (Chatham), Middlesex County, Connecticut, USA |
| Data Identifiers |
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| Mindat Occurrence Record ID: | 102034 |
| Long-form Identifier: | 1:3:102034:2 |
| GUID (UUID V4): | fdf657d9-5ca2-4be3-a0c6-8fed885a7c5d |
| Nearest other occurrences of Biotite |
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| 5.6km (3.5 miles) | ⓘLinkpot cut, Airline Railroad, East Hampton (Chatham), Middlesex County, Connecticut, USA |
| 5.6km (3.5 miles) | ⓘWorth and Selden Quarries (Victoria Quarry), East Hampton (Chatham), Middlesex County, Connecticut, USA |
| 7.3km (4.5 miles) | ⓘBailey prospect, East Hampton (Chatham), Middlesex County, Connecticut, USA |
| 8.5km (5.3 miles) | ⓘLyman Viaduct at Dickinson Creek, Westchester, Colchester, New London County, Connecticut, USA |
| 11.1km (6.9 miles) | ⓘJohn Salak Quarry, Haddam, Middlesex County, Connecticut, USA |
| 12.2km (7.6 miles) | ⓘTimms Hill (Tim's Hill; Iolite Hill), Haddam, Middlesex County, Connecticut, USA |
| 12.3km (7.6 miles) | ⓘJail Hill Road locality (Jail Hill Quarry), Haddam, Middlesex County, Connecticut, USA |
| 12.3km (7.6 miles) | ⓘArnold Granite Quarry (General Brainerd Quarry; Great Hill Quarry; Hazelton Quarry; Haddam Quarry; Brookes Quarry), Haddam, Middlesex County, Connecticut, USA |
| 13.6km (8.5 miles) | ⓘState Route 9 Interchange 13 - Beaver Meadow Road, Haddam, Middlesex County, Connecticut, USA |
| 14.9km (9.2 miles) | ⓘState Route 9 rock cuts, Haddam, Middlesex County, Connecticut, USA |
| References |
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