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


Locality type:Mine
Classification
Species:Sillimanite
Formula:Al2(SiO4)O
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Sillimanite data
Locality Data:Click here to view Palermo No. 1 Mine, Groton, Grafton County, New Hampshire, USA
Data Identifiers
Mindat Occurrence Record ID:259478
Long-form Identifier:1:3:259478:1
GUID (UUID V4):0
Nearest other occurrences of Sillimanite
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
7.2km (4.5 miles) ⓘAtwood Mine, Rumney, Grafton County, New Hampshire, USA
7.8km (4.8 miles) ⓘKeyes Mica Quarries, Orange, Grafton County, New Hampshire, USA
7.9km (4.9 miles) ⓘBelden Mine, Rumney, Grafton County, New Hampshire, USA
8.7km (5.4 miles) ⓘWheat Mine, Rumney, Grafton County, New Hampshire, USA
10.7km (6.6 miles) ⓘEight-Ball Mica prospect, Rumney, Grafton County, New Hampshire, USA
11.5km (7.2 miles) ⓘStandard Mine, Orange, Grafton County, New Hampshire, USA
16.0km (9.9 miles) ⓘLower Baker Pond Brook Occurrences, Wentworth, Grafton County, New Hampshire, USA
References
Page & Larrabee, 1962. Beryl Resources of NH (USGS Prof. Paper 353)
USGS Prof Paper 353
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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