Vote for your favorite mineral in #MinCup26! - Sphalerite vs. Anorthite
Both zinc ore Sphalerite and calcium plagioclase feldspar Anorthite have perfect cleavage that will split cleanly if you hit them with a hammer, but only one can claim a larger split of your votes!
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Biotite from
Keyes Mica Quarries, Orange, Grafton County, New Hampshire, USA


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
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Biotite data
Locality Data:Click here to view Keyes Mica Quarries, Orange, Grafton County, New Hampshire, USA
Data Identifiers
Mindat Occurrence Record ID:32265
Long-form Identifier:1:3:32265:6
GUID (UUID V4):0
Localities for Biotite in this Region
No. 1 pit, Keyes Mica Quarries, Orange, Grafton County, New Hampshire, USA
No. 6 pit, Keyes Mica Quarries, Orange, Grafton County, New Hampshire, USA
Nearest other occurrences of Biotite
0.0km (0.0 miles) ⓘNo. 1 pit, Keyes Mica Quarries, Orange, Grafton County, New Hampshire, USA
3.8km (2.4 miles) ⓘStandard Mine, Orange, Grafton County, New Hampshire, USA
6.9km (4.3 miles) ⓘRice Quarry, Groton, Grafton County, New Hampshire, USA
7.7km (4.8 miles) ⓘPalermo No. 2 Mine, Groton, Grafton County, New Hampshire, USA
7.8km (4.8 miles) ⓘPalermo No. 1 Mine, Groton, Grafton County, New Hampshire, USA
8.7km (5.4 miles) ⓘTruman Patten Quarry, Alexandria, Grafton County, New Hampshire, USA
9.1km (5.6 miles) ⓘMorgan Mica prospect, Alexandria, Grafton County, New Hampshire, USA
9.1km (5.7 miles) ⓘCharles Davis Mine, Groton, Grafton County, New Hampshire, USA
9.4km (5.8 miles) ⓘMarston Quarry, Alexandria, Grafton County, New Hampshire, USA
10.2km (6.3 miles) ⓘMonarch Quarry, Alexandria, Grafton County, New Hampshire, USA
References
Smith, Arthur E. (2005) New Hampshire mineral locality index. Rocks & Minerals, 80 (4) 242-261 doi:10.3200/rmin.80.4.242-261
Thompson, Woodrow B., Falster, Alexander U., Mortimer, Thomas J. (2022) The Keyes Mica Mines, Orange, Grafton County, New Hampshire. Rocks & Minerals, 97 (4) 302-329 doi:10.1080/00357529.2022.2053622
 
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