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Biotite from
Rollstone Hill Quarries, Fitchburg, Worcester County, Massachusetts, USA

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09348070017362082417480.jpg
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Locality type:Quarry
Classification
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
Validity:Believed Valid
Data
Mineral Data:Click here to view Biotite data
Locality Data:Click here to view Rollstone Hill Quarries, Fitchburg, Worcester County, Massachusetts, USA
Data Identifiers
Mindat Occurrence Record ID:127271
Long-form Identifier:1:3:127271:0
GUID (UUID V4):0
Nearest other occurrences of Biotite
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
Hitchen (1935)
 
and/or 
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To cite: Ralph, J., Von Bargen, D., Martynov, P., Zhang, J., Que, X., Prabhu, A., Morrison, S. M., Li, W., Chen, W., & Ma, X. (2025). Mindat.org: The open access mineralogy database to accelerate data-intensive geoscience research. American Mineralogist, 110(6), 833–844.doi:10.2138/am-2024-9486.
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