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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Allanite Group from
Masons Island Quarry, Stonington, New London County, Connecticut, USA


Locality type:Quarry
Classification
Species:'Allanite Group' (not an IMA approved species)
Formula:(A12+REE3+)(M13+M23+M32+)O[Si2O7][SiO4](OH)
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Allanite Group data
Locality Data:Click here to view Masons Island Quarry, Stonington, New London County, Connecticut, USA
Data Identifiers
Mindat Occurrence Record ID:720297
Long-form Identifier:1:3:720297:1
GUID (UUID V4):0
Nearest other occurrences of Allanite Group
12.6km (7.8 miles) ⓘState Route 1 bypass, Westerly, Washington County, Rhode Island, USA
14.4km (9.0 miles) ⓘGoos Quarry, Waterford, New London County, Connecticut, USA
34.1km (21.2 miles) ⓘJoshua Rock Quarry, Lyme, New London County, Connecticut, USA
47.0km (29.2 miles) ⓘArnold Granite Quarry (General Brainerd Quarry; Great Hill Quarry; Hazelton Quarry; Haddam Quarry; Brookes Quarry), Haddam, Middlesex County, Connecticut, USA
48.4km (30.0 miles) ⓘTimms Hill (Tim's Hill; Iolite Hill), Haddam, Middlesex County, Connecticut, USA
48.6km (30.2 miles) ⓘMansfield Hollow Dam, Windham, Windham County, Connecticut, USA
58.2km (36.2 miles) ⓘHale-Walker prospects, Collins Hill, Portland, Middlesex County, Connecticut, USA
61.7km (38.3 miles) ⓘHollister prospects, South Glastonbury, Glastonbury, Hartford County, Connecticut, USA
61.8km (38.4 miles) ⓘSimpson Quarry (Wiarda Quarry), South Glastonbury, Glastonbury, Hartford County, Connecticut, USA
62.2km (38.6 miles) ⓘHowe Quarry (Howe #1 Quarry; Huspband Quarry), South Glastonbury, Glastonbury, Hartford County, Connecticut, USA
References
Dale, T. Nelson; Gregory Herbert E. (1911) The granites of Connecticut. Bulletin 484. US Geological Survey doi:10.3133/b484
 
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