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
Franconia, Grafton County, New Hampshire, USA


Locality type:Town
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 Franconia, Grafton County, New Hampshire, USA
Data Identifiers
Mindat Occurrence Record ID:52691
Long-form Identifier:1:3:52691:5
GUID (UUID V4):0
Nearest other occurrences of Sillimanite
41.5km (25.8 miles) ⓘLower Baker Pond Brook Occurrences, Wentworth, Grafton County, New Hampshire, USA
43.5km (27.0 miles) ⓘEight-Ball Mica prospect, Rumney, Grafton County, New Hampshire, USA
43.5km (27.0 miles) ⓘCottonstone Mountain, Orford, Grafton County, New Hampshire, USA
45.4km (28.2 miles) ⓘWheat Mine, Rumney, Grafton County, New Hampshire, USA
46.1km (28.7 miles) ⓘArchertown Brook Occurrences, Orford, Grafton County, New Hampshire, USA
46.2km (28.7 miles) ⓘBelden Mine, Rumney, Grafton County, New Hampshire, USA
46.4km (28.8 miles) ⓘEastman Ledges, Orford, Grafton County, New Hampshire, USA
46.8km (29.1 miles) ⓘNorthey Hill Line Occurrences, Orford, Grafton County, New Hampshire, USA
47.0km (29.2 miles) ⓘAtwood Mine, Rumney, Grafton County, New Hampshire, USA
52.4km (32.5 miles) ⓘFletcher Mine, Groton, Grafton County, New Hampshire, USA
References
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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