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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Tourmaline from
Walden Gem Quarry, Portland, Middlesex County, Connecticut, USA


08356520017617545366634.jpg
Elbaite, etc.

Walden Gem Quarry, Portland, Middlesex County, Connecticut, USA
06641070017410620996118.jpg
Elbaite, etc.

Walden Gem Quarry, Portland, Middlesex County, Connecticut, USA
08141500017272736543549.jpg
Elbaite, etc.

Walden Gem Quarry, Portland, Middlesex County, Connecticut, USA
05212870017361082293831.jpg
Elbaite, etc.

Walden Gem Quarry, Portland, Middlesex County, Connecticut, USA
03736130017617544679855.jpg
Elbaite, etc.

Walden Gem Quarry, Portland, Middlesex County, Connecticut, USA
07638830017410612096639.jpg
Elbaite, etc.

Walden Gem Quarry, Portland, Middlesex County, Connecticut, USA
00699490017410999362323.jpg
Elbaite, etc.

Walden Gem Quarry, Portland, Middlesex County, Connecticut, USA
05212870017361082293831.jpg
Elbaite, etc.

Walden Gem Quarry, Portland, Middlesex County, Connecticut, USA
04086450017617945187824.jpg
Elbaite, etc.

Walden Gem Quarry, Portland, Middlesex County, Connecticut, USA
09592300017410999369508.jpg
Elbaite, etc.

Walden Gem Quarry, Portland, Middlesex County, Connecticut, USA
08141500017272736543549.jpg
Elbaite, etc.

Walden Gem Quarry, Portland, Middlesex County, Connecticut, USA
05212870017361082293831.jpg
Elbaite, etc.

Walden Gem Quarry, Portland, Middlesex County, Connecticut, USA
Locality type:Quarry
Classification
Species:'Tourmaline' (not an IMA approved species)
Formula:AD3G6(T6O18)(BO3)3X3Z
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Tourmaline data
Locality Data:Click here to view Walden Gem Quarry, Portland, Middlesex County, Connecticut, USA
Data Identifiers
Mindat Occurrence Record ID:657187
Long-form Identifier:1:3:657187:0
GUID (UUID V4):0
Nearest other occurrences of Tourmaline
0.2km (0.1 miles) ⓘGotta-Walden Prospect, Portland, Middlesex County, Connecticut, USA
1.2km (0.7 miles) ⓘHale Quarry (Andrews Quarry; Glastonbury Quarry), Portland, Middlesex County, Connecticut, USA
2.4km (1.5 miles) ⓘSimpson Quarry (Wiarda Quarry), South Glastonbury, Glastonbury, Hartford County, Connecticut, USA
2.8km (1.7 miles) ⓘHollister prospects, South Glastonbury, Glastonbury, Hartford County, Connecticut, USA
2.9km (1.8 miles) ⓘSchoonmaker Mine, Strickland pegmatite, Collins Hill, Portland, Middlesex County, Connecticut, USA
3.0km (1.8 miles) ⓘStrickland Quarry, Strickland pegmatite, Collins Hill, Portland, Middlesex County, Connecticut, USA
3.8km (2.3 miles) ⓘHale-Walker prospects, Collins Hill, Portland, Middlesex County, Connecticut, USA
6.0km (3.7 miles) ⓘGreat Hill cobalt mines, Cobalt, East Hampton, Middlesex County, Connecticut, USA
7.2km (4.5 miles) ⓘWhite Rocks Quarry (Consolidated Quarry), White Rock Mining District, Middletown, Middlesex County, Connecticut, USA
7.9km (4.9 miles) ⓘBrack Gem prospect (Brack prospect), East Glastonbury, Glastonbury, Hartford County, Connecticut, USA
References
Rocks & Minerals (1970) 45:443-449
Rocks & Minerals (1970) 45:595-600
 
and/or  
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