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
Morris Dam Quarry (East Morris Dam), Morris, Litchfield County, Connecticut, USA


Locality type:Quarry
Classification
Species:Bertrandite
Formula:Be4(Si2O7)(OH)2
Formation:Secondary
Comments:micro-crystals in cavities
Quality for species:Good crystals or rich for species - important (!)
Abundance at site:Rare
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Bertrandite data
Locality Data:Click here to view Morris Dam Quarry (East Morris Dam), Morris, Litchfield County, Connecticut, USA
Data Identifiers
Mindat Occurrence Record ID:37862
Long-form Identifier:1:3:37862:8
GUID (UUID V4):0
Nearest other occurrences of Bertrandite
3.6km (2.2 miles) ⓘRoute 109 roadcut, Thomaston, Litchfield County, Connecticut, USA
11.6km (7.2 miles) ⓘWoodbury pegmatite quarry (Judson Quarry), Woodbury, Litchfield County, Connecticut, USA
24.0km (14.9 miles) ⓘRoebling Quarry, Upper Merryall, New Milford, Litchfield County, Connecticut, USA
25.1km (15.6 miles) ⓘCurtis Quarry, Southford, Southbury, New Haven County, Connecticut, USA
32.3km (20.0 miles) ⓘU. S. Route 7 Expressway (Danbury line to Iron Works District), Brookfield, Fairfield County, Connecticut, USA
38.0km (23.6 miles) ⓘColebrook Dam and Colebrook River Lake, Colebrook, Litchfield County, Connecticut, USA
38.9km (24.2 miles) ⓘCaptain Cook's Quarry (Purdy Station Quarry), Newtown, Fairfield County, Connecticut, USA
39.4km (24.5 miles) ⓘBiermann Quarries (Bethel quarries; Codfish Hill Quarry), Bethel, Fairfield County, Connecticut, USA
43.2km (26.8 miles) ⓘOld Mine Plaza construction site, Long Hill, Trumbull, Fairfield County, Connecticut, USA
46.4km (28.8 miles) ⓘState Route 25 road cuts, Trumbull, Fairfield 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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