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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Oligoclase from
Strickland Quarry, Strickland pegmatite, Collins Hill, Portland, Middlesex County, Connecticut, USA


Locality type:Quarry
Classification
Species:Albite var: Oligoclase
Formula:(Na,Ca)[Al(Si,Al)Si2O8]
Comments:The typical albite variety in host metamorphic rocks, best crystals are parallel growth habit in Alpine-cleft type openings within the host Collins Hill Formation schist unit, with cubic pyrite, chlorite and tiny anatase crystals.
Habit:anhedral grains to parallel-growth
Colour:white
Quality for species:Rock forming mineral/non-crystalline/little interest for collectors.(##)
Abundance at site:Extremely common
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Oligoclase data
Locality Data:Click here to view Strickland Quarry, Strickland pegmatite, Collins Hill, Portland, Middlesex County, Connecticut, USA
Data Identifiers
Mindat Occurrence Record ID:96217
Long-form Identifier:1:3:96217:1
GUID (UUID V4):0
Nearest other occurrences of Oligoclase
9.3km (5.7 miles) ⓘLinkpot cut, Airline Railroad, East Hampton, Middlesex County, Connecticut, USA
13.0km (8.1 miles) ⓘGillette Quarry (J-J Mine; Haddam Neck Quarry), Haddam Neck, Haddam, Middlesex County, Connecticut, USA
13.4km (8.4 miles) ⓘChrysoberyl locality, Haddam, Middlesex County, Connecticut, USA
13.7km (8.5 miles) ⓘHill above the parsonage (unnamed feldspar quarry), Haddam, Middlesex County, Connecticut, USA
14.7km (9.1 miles) ⓘTimms Hill (Tim's Hill; Iolite Hill), Haddam, Middlesex County, Connecticut, USA
16.0km (10.0 miles) ⓘState Route 9 Interchange 13 - Beaver Meadow Road, Haddam, Middlesex County, Connecticut, USA
36.2km (22.5 miles) ⓘStony Creek Quarry (Norcross Granite Gneiss Rock Quarries; Castellucci Quarry), Branford, New Haven County, Connecticut, USA
38.5km (23.9 miles) ⓘMacCurdy Quarry, Old Lyme, New London County, Connecticut, USA
41.3km (25.6 miles) ⓘThomaston Dam railroad cut, Thomaston Dam, Thomaston, Litchfield County, Connecticut, USA
43.2km (26.8 miles) ⓘRatlum Mountain, Canton, Hartford County, Connecticut, USA
References
Stugard, Frederick Jr. (1958) Pegmatites of the Middletown area, Connecticut. Bulletin 1042q. US Geological Survey doi:10.3133/b1042q
 
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