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
Palermo No. 1 Mine, Groton, Grafton County, New Hampshire, USA


03575900017272036008987.jpg
Biotite

Palermo No. 1 Mine, Groton, Grafton County, New Hampshire, USA
03575900017272036008987.jpg
Biotite

Palermo No. 1 Mine, Groton, Grafton County, New Hampshire, USA
03575900017272036008987.jpg
Biotite

Palermo No. 1 Mine, Groton, 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 Palermo No. 1 Mine, Groton, Grafton County, New Hampshire, USA
Data Identifiers
Mindat Occurrence Record ID:27985
Long-form Identifier:1:3:27985:9
GUID (UUID V4):0
Nearest other occurrences of Biotite
0.3km (0.2 miles) ⓘPalermo No. 2 Mine, Groton, Grafton County, New Hampshire, USA
0.9km (0.6 miles) ⓘRice Quarry, Groton, Grafton County, New Hampshire, USA
1.4km (0.9 miles) ⓘCharles Davis Mine, Groton, Grafton County, New Hampshire, USA
5.1km (3.2 miles) ⓘFletcher Mine, Groton, Grafton County, New Hampshire, USA
6.8km (4.2 miles) ⓘKeniston mica prospect, Rumney, Grafton County, New Hampshire, USA
7.8km (4.8 miles) ⓘNo. 1 pit, Keyes Mica Quarries, Orange, Grafton County, New Hampshire, USA
7.8km (4.8 miles) ⓘKeyes Mica Quarries, Orange, Grafton County, New Hampshire, USA
7.9km (4.9 miles) ⓘLeggett mica prospect, Rumney, Grafton County, New Hampshire, USA
8.7km (5.4 miles) ⓘWheat Mine, Rumney, Grafton County, New Hampshire, USA
10.5km (6.5 miles) ⓘMorgan Mica prospect, Alexandria, 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
Korzeb, Stanley L., Foord, Eugene E., Lichte, Frederick E. (1997) The chemical evolution and paragenesis of uranium minerals from the Ruggles and Palermo granitic pegmatites, New Hampshire. The Canadian Mineralogist: 35(1): 135-144.
 
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