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
Route 109 roadcut, Thomaston, Litchfield County, Connecticut, USA


Locality type:Road Cutting
Classification
Species:Bertrandite
Formula:Be4(Si2O7)(OH)2
Formation:Secondary
Comments:Microcrystals with chlorite and anatse in voids in "white feldspar".
Confirmation
Validity:Confirmed
Confirmation Methods:Visually Identified
Data
Mineral Data:Click here to view Bertrandite data
Locality Data:Click here to view Route 109 roadcut, Thomaston, Litchfield County, Connecticut, USA
Data Identifiers
Mindat Occurrence Record ID:657196
Long-form Identifier:1:3:657196:2
GUID (UUID V4):0
Nearest other occurrences of Bertrandite
3.6km (2.2 miles) ⓘMorris Dam Quarry (East Morris Dam), Morris, Litchfield County, Connecticut, USA
12.2km (7.6 miles) ⓘWoodbury pegmatite quarry (Judson Quarry), Woodbury, Litchfield County, Connecticut, USA
24.2km (15.0 miles) ⓘCurtis Quarry, Southford, Southbury, New Haven County, Connecticut, USA
27.2km (16.9 miles) ⓘRoebling Quarry, Upper Merryall, New Milford, Litchfield County, Connecticut, USA
33.5km (20.8 miles) ⓘU. S. Route 7 Expressway (Danbury line to Iron Works District), Brookfield, Fairfield County, Connecticut, USA
38.8km (24.1 miles) ⓘColebrook Dam and Colebrook River Lake, Colebrook, Litchfield County, Connecticut, USA
39.1km (24.3 miles) ⓘCaptain Cook's Quarry (Purdy Station Quarry), Newtown, Fairfield County, Connecticut, USA
39.7km (24.7 miles) ⓘBiermann Quarries (Bethel quarries; Codfish Hill Quarry), Bethel, Fairfield County, Connecticut, USA
42.4km (26.4 miles) ⓘOld Mine Plaza construction site, Long Hill, Trumbull, Fairfield County, Connecticut, USA
43.5km (27.0 miles) ⓘSchoonmaker Mine, Strickland pegmatite, Collins Hill, Portland, 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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