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
Mud Mica Mine, Alexandria, Grafton County, New Hampshire, USA


Locality type:Mine
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 Mud Mica Mine, Alexandria, Grafton County, New Hampshire, USA
Data Identifiers
Mindat Occurrence Record ID:32376
Long-form Identifier:1:3:32376:1
GUID (UUID V4):0
Nearest other occurrences of Biotite
1.3km (0.8 miles) ⓘPattuck Quarry, Alexandria, Grafton County, New Hampshire, USA
1.3km (0.8 miles) ⓘMiddle pegmatite, E.E. Smith Mine, Alexandria, Grafton County, New Hampshire, USA
1.9km (1.2 miles) ⓘNew Haven Mica Quarry, Alexandria, Grafton County, New Hampshire, USA
3.4km (2.1 miles) ⓘWadhams-Tucker Quarry, Alexandria, Grafton County, New Hampshire, USA
4.5km (2.8 miles) ⓘMonarch Quarry, Alexandria, Grafton County, New Hampshire, USA
4.8km (3.0 miles) ⓘMelvin Mountain, Grafton, Grafton County, New Hampshire, USA
5.0km (3.1 miles) ⓘTruman Patten Quarry, Alexandria, Grafton County, New Hampshire, USA
5.7km (3.5 miles) ⓘMarston Quarry, Alexandria, Grafton County, New Hampshire, USA
6.6km (4.1 miles) ⓘMorgan Mica prospect, Alexandria, Grafton County, New Hampshire, USA
11.5km (7.1 miles) ⓘStandard Mine, Orange, Grafton County, New Hampshire, USA
References
Cameron, Eugene N., Larrabee, David M., McNair, Andrew H., Page, James J., Stewart, Glen W., Shainin, Vincent E. (1954) Pegmatite Investigations, 1942-45, in New England. Geological Survey Professional Paper 255. US Geological Survey doi:10.3133/pp255
Smith, Arthur E. (2005) New Hampshire mineral locality index. Rocks & Minerals, 80 (4) 242-261 doi:10.3200/rmin.80.4.242-261
 
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