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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Quartz from
Fletcher Mine, Groton, Grafton County, New Hampshire, USA


Locality type:Mine
Classification
Species:Quartz
Formula:SiO2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Quartz data
Locality Data:Click here to view Fletcher Mine, Groton, Grafton County, New Hampshire, USA
Data Identifiers
Mindat Occurrence Record ID:37133
Long-form Identifier:1:3:37133:3
GUID (UUID V4):0
Nearest other occurrences of Quartz
4.5km (2.8 miles) ⓘCharles Davis Mine, Groton, Grafton County, New Hampshire, USA
5.1km (3.2 miles) ⓘPalermo No. 1 Mine, Groton, Grafton County, New Hampshire, USA
5.3km (3.3 miles) ⓘPalermo No. 2 Mine, Groton, Grafton County, New Hampshire, USA
5.3km (3.3 miles) ⓘKeniston mica prospect, Rumney, Grafton County, New Hampshire, USA
5.8km (3.6 miles) ⓘRice Quarry, Groton, Grafton County, New Hampshire, USA
7.5km (4.6 miles) ⓘAtwood Mine, Rumney, Grafton County, New Hampshire, USA
7.5km (4.6 miles) ⓘBelden Mine, Rumney, Grafton County, New Hampshire, USA
7.9km (4.9 miles) ⓘWheat Mine, Rumney, Grafton County, New Hampshire, USA
8.4km (5.2 miles) ⓘLeggett mica prospect, Rumney, Grafton County, New Hampshire, USA
9.5km (5.9 miles) ⓘEight-Ball Mica prospect, Rumney, 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
Kreinik, Susanna T. (2022) Phosphate Mineralogy and Paragenesis of the Fletcher Pegmatite, North Groton, New Hampshire. M.S. Thesis, 3039. University of New Orleans. 1-105
 
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