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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Bertrandite from
State Forest Quarry No. 2, Cobalt, East Hampton, Middlesex County, Connecticut, USA


Locality type:Quarry
Classification
Species:Bertrandite
Formula:Be4(Si2O7)(OH)2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Bertrandite data
Locality Data:Click here to view State Forest Quarry No. 2, Cobalt, East Hampton, Middlesex County, Connecticut, USA
Data Identifiers
Mindat Occurrence Record ID:657199
Long-form Identifier:1:3:657199:3
GUID (UUID V4):0
Nearest other occurrences of Bertrandite
3.5km (2.2 miles) ⓘPelton's Quarry, Portland, Middlesex County, Connecticut, USA
3.8km (2.3 miles) ⓘStrickland Quarry, Strickland pegmatite, Collins Hill, Portland, Middlesex County, Connecticut, USA
3.8km (2.4 miles) ⓘSchoonmaker Mine, Strickland pegmatite, Collins Hill, Portland, Middlesex County, Connecticut, USA
4.6km (2.9 miles) ⓘWhite Rocks Quarry (Consolidated Quarry), White Rock Mining District, Middletown, Middlesex County, Connecticut, USA
5.4km (3.4 miles) ⓘWorth and Selden Quarries (Victoria Quarry), East Hampton, Middlesex County, Connecticut, USA
6.7km (4.2 miles) ⓘTollgate Quarry (Tollgate Mine; Bidwell Quarry; China-stone Quarry), Middletown, Middlesex County, Connecticut, USA
7.0km (4.4 miles) ⓘAnderson No. 1 Mica Mine, East Hampton, Middlesex County, Connecticut, USA
8.3km (5.1 miles) ⓘSlocum prospect, East Hampton, Middlesex County, Connecticut, USA
10.3km (6.4 miles) ⓘQuarry Hill (Brainerd Quarries; Shailor Quarries), Haddam Neck, Haddam, Middlesex County, Connecticut, USA
11.3km (7.0 miles) ⓘConnecticut Yankee atomic power plant, Haddam Neck, Haddam, Middlesex County, Connecticut, USA
References
Henderson, William A. Jr. (1975) The Bertrandites of Connecticut, in May - June 1975. The Mineralogical Record, 6 (3) Tucson. 114-123
 
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