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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Sillimanite from
Rice Quarry, Groton, Grafton County, New Hampshire, USA


Locality type:Mine
Classification
Species:Sillimanite
Formula:Al2(SiO4)O
Comments:In schist
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Sillimanite data
Locality Data:Click here to view Rice Quarry, Groton, Grafton County, New Hampshire, USA
Data Identifiers
Mindat Occurrence Record ID:38287
Long-form Identifier:1:3:38287:0
GUID (UUID V4):0
Nearest other occurrences of Sillimanite
0.9km (0.6 miles) ⓘPalermo No. 1 Mine, Groton, Grafton County, New Hampshire, USA
2.2km (1.4 miles) ⓘCharles Davis Mine, Groton, Grafton County, New Hampshire, USA
5.8km (3.6 miles) ⓘFletcher Mine, Groton, Grafton County, New Hampshire, USA
6.9km (4.3 miles) ⓘKeyes Mica Quarries, Orange, Grafton County, New Hampshire, USA
7.9km (4.9 miles) ⓘAtwood Mine, Rumney, Grafton County, New Hampshire, USA
8.7km (5.4 miles) ⓘBelden Mine, Rumney, Grafton County, New Hampshire, USA
9.5km (5.9 miles) ⓘWheat Mine, Rumney, Grafton County, New Hampshire, USA
10.7km (6.6 miles) ⓘStandard Mine, Orange, Grafton County, New Hampshire, USA
11.5km (7.1 miles) ⓘEight-Ball Mica prospect, Rumney, Grafton County, New Hampshire, USA
16.4km (10.2 miles) ⓘLower Baker Pond Brook Occurrences, Wentworth, 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
 
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