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


00612000017272015751164.jpg
Opal-AN, etc.

Walden Gem Quarry, Portland, Middlesex County, Connecticut, USA
04084290017363455331581.jpg
Opal-AN, etc.

Walden Gem Quarry, Portland, Middlesex County, Connecticut, USA
09711430017272015787994.jpg
Opal-AN

Walden Gem Quarry, Portland, Middlesex County, Connecticut, USA
00230450017363455344990.jpg
Opal-AN

Walden Gem Quarry, Portland, Middlesex County, Connecticut, USA
00612000017272015751164.jpg
Opal-AN, etc.

Walden Gem Quarry, Portland, Middlesex County, Connecticut, USA
04084290017363455331581.jpg
Opal-AN, etc.

Walden Gem Quarry, Portland, Middlesex County, Connecticut, USA
09711430017272015787994.jpg
Opal-AN

Walden Gem Quarry, Portland, Middlesex County, Connecticut, USA
00230450017363455344990.jpg
Opal-AN

Walden Gem Quarry, Portland, Middlesex County, Connecticut, USA
00612000017272015751164.jpg
Opal-AN, etc.

Walden Gem Quarry, Portland, Middlesex County, Connecticut, USA
04772090017363455346205.jpg
Opal-AN, etc.

Walden Gem Quarry, Portland, Middlesex County, Connecticut, USA
06889500017272015848886.jpg
Opal-AN

Walden Gem Quarry, Portland, Middlesex County, Connecticut, USA
09695960017363455342205.jpg
Opal-AN

Walden Gem Quarry, Portland, Middlesex County, Connecticut, USA
Locality type:Quarry
Classification
Species:Opal
Formula:SiO2 · nH2O
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Opal data
Locality Data:Click here to view Walden Gem Quarry, Portland, Middlesex County, Connecticut, USA
Data Identifiers
Mindat Occurrence Record ID:657259
Long-form Identifier:1:3:657259:4
GUID (UUID V4):0
Nearest other occurrences of Opal
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
1.5km (0.9 miles) ⓘCase Quarries, Portland, Middlesex County, Connecticut, USA
2.2km (1.4 miles) ⓘSimpson prospect #1, South Glastonbury, Glastonbury, Hartford County, Connecticut, USA
2.3km (1.4 miles) ⓘHowe Quarry (Howe #1 Quarry; Huspband Quarry), South Glastonbury, Glastonbury, Hartford County, Connecticut, USA
2.4km (1.5 miles) ⓘSimpson Quarry (Wiarda Quarry), South Glastonbury, Glastonbury, Hartford County, Connecticut, USA
2.5km (1.6 miles) ⓘPelton's Quarry, Portland, Middlesex County, Connecticut, USA
2.8km (1.7 miles) ⓘHollister prospects, South Glastonbury, Glastonbury, Hartford County, Connecticut, USA
3.0km (1.8 miles) ⓘEureka Quarries, South Glastonbury, Glastonbury, Hartford County, Connecticut, USA
3.0km (1.8 miles) ⓘStrickland Quarry, Strickland pegmatite, Collins Hill, Portland, Middlesex County, Connecticut, USA
References
Rocks & Minerals (1970) 45:595-600
 
and/or  
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