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Oligoclase from
Danburite type locality, Danbury, Fairfield County, Connecticut, USA

Classification
Species:Albite var: Oligoclase
Formula:(Na,Ca)[Al(Si,Al)Si2O8]
Comments:In dolomite and intimately associated with a K-spar and rarely danburite. Specimens preserved at Yale Peabody Museum range from coarse-granular to elongated subhedral (to a few cms), are white, opaque to translucent, with abundant polysynthetic twinning and adamantine luster on the abundant cleavage. Rather dull fluorescence under LW UV, pale yellow-white.
Habit:granular, massive to subhedral
Colour:white to pale bluish-white
Luminescent properties:pale yellow-white
Quality for species:Rock forming mineral/non-crystalline/little interest for collectors.(##)
Abundance at site:Common
Confirmation
Validity:Believed Valid
References
References:Shepard, Charles U. (1839): Notice of Danburite, a new mineral species. American Journal of Science: series 1, 35 (1): 137-139; Smith, Lawrence J. and George J. Brush. (1853a): Reexamination of American Minerals, Part II. American Journal of Science: series 2, 16 (46): 44.
Data
Mineral Data:Click here to view Oligoclase data
Locality Data:Click here to view Danburite type locality, Danbury, Fairfield County, Connecticut, USA
Nearest other occurrences of Oligoclase
14.3km (8.9 miles) Fillow Quarry (Branchville Quarry; Branchville Mica Mine; Smith Mine), Branchville, Redding (Reading), Fairfield County, Connecticut, USA
15.8km (9.8 miles) Tilly Foster Iron Mine, Brewster, Town of Southeast, Putnam Co., New York, USA
19.1km (11.8 miles) Clover Hill Mine, Croton Falls, Somers Township, Westchester Co., New York, USA
22.0km (13.7 miles) Old Mine Plaza construction site, Long Hill, Trumbull, Fairfield County, Connecticut, USA
22.4km (13.9 miles) Old Mine Park (Old Tungsten Mine), Long Hill, Trumbull, Fairfield County, Connecticut, USA
31.1km (19.3 miles) Norwalk, Fairfield County, Connecticut, USA
42.1km (26.2 miles) Crugers Emery Mine, Montrose, Cortlandt Township, Westchester Co., New York, USA
44.5km (27.7 miles) Anthony's Nose, Cortlandt Township, Westchester Co., New York, USA
44.5km (27.7 miles) Philips Mine (Philips Pyrite Mine; Anthony's Nose Pyrrhotite Mine), Anthony's Nose, Philipstown Township, Putnam Co., New York, USA
44.7km (27.8 miles) Valhalla, Mount Pleasant, Westchester Co., New York, USA
 
Mineral and/or Locality  
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