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
Monarch Quarry, Alexandria, 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 Monarch Quarry, Alexandria, Grafton County, New Hampshire, USA
Data Identifiers
Mindat Occurrence Record ID:32240
Long-form Identifier:1:3:32240:7
GUID (UUID V4):0
Nearest other occurrences of Biotite
1.2km (0.7 miles) ⓘMarston Quarry, Alexandria, Grafton County, New Hampshire, USA
1.2km (0.8 miles) ⓘWadhams-Tucker Quarry, Alexandria, Grafton County, New Hampshire, USA
1.6km (1.0 miles) ⓘTruman Patten Quarry, Alexandria, Grafton County, New Hampshire, USA
2.1km (1.3 miles) ⓘMorgan Mica prospect, Alexandria, Grafton County, New Hampshire, USA
3.2km (2.0 miles) ⓘNew Haven Mica Quarry, Alexandria, Grafton County, New Hampshire, USA
3.2km (2.0 miles) ⓘMiddle pegmatite, E.E. Smith Mine, Alexandria, Grafton County, New Hampshire, USA
3.4km (2.1 miles) ⓘPattuck Quarry, Alexandria, Grafton County, New Hampshire, USA
4.5km (2.8 miles) ⓘMud Mica Mine, Alexandria, Grafton County, New Hampshire, USA
7.1km (4.4 miles) ⓘMelvin Mountain, Grafton, Grafton County, New Hampshire, USA
10.2km (6.3 miles) ⓘNo. 1 pit, Keyes Mica Quarries, Orange, Grafton County, New Hampshire, USA
References
 
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