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Samarskite-(Y) from
Spinelli prospect (Spinelli quarry), Glastonbury, Hartford Co., Connecticut, USA

Locality type:Prospect
Classification
Species:Samarskite-(Y)
Formula:YFe3+Nb2O8
Comments:Crystals usually in aggregates (up to 15 cm) typically well terminated but very brittle and easily damaged due to incipient fractures and metamict nature. Fractures conchoidally with lustrous, pitch-black surface. Commonly associated with columbite-(Fe) that has a duller luster especially on the fracture face. Coated with clays from altered surrounding feldspars that are reddish colored, and thin muscovite, both can be removed with micro-blasting using soft abrasive.
Habit:radiating to subparallel prismatic groups with dome terminations
Colour:black
Quality for species:Excellent - world class for species or very significant. (!!)
Abundance at site:Common
Confirmation
Validity:Believed Valid
References
References:Davis, Fred E. and Stefan Nicolescu. (2011): Samarskite Rediscovered at the Spinelli Prospect, Glastonbury, Connecticut. Bulletin of the Peabody Museum of Natural History: 52(1):135-152; Rocks & Min.: 62:413; Wells, R. C., 1937, Analyses of Rocks and Minerals from the Laboratory of the United States Geological Survey 1914-36, U. S. Geological Survey Bulletin 878; Hanson, S. L., Jarnot, B. M., Falster, A. U., Simmons, W. B., Nizamoff, J. W., 2003, Nb-Ta-Ti oxide minerals from two pegmatites of the Middletown area, Connecticut, Rochester Mineralogical Symposium Abstracts, pp. 11-12; USGS Prof Paper 255; Albini, A.J. and Moritz, H. (2013), Collecting samarskite at the historic Spinelli prospect, Glastonbury, Hartford County, Connecticut. The 40th Rochester Mineralogical Symposium, Contributed Papers in Specimen Mineralogy, 8.
Associated Minerals Based on Photo Data:
Columbite-(Fe)20 photos of Samarskite-(Y) associated with Columbite-(Fe) at this locality.
Data
Mineral Data:Click here to view Samarskite-(Y) data
Locality Data:Click here to view Spinelli prospect (Spinelli quarry), Glastonbury, Hartford Co., Connecticut, USA
Photo GalleryView Gallery (37 photos)
Nearest other occurrences of Samarskite-(Y)
1.9km (1.2 miles) Knob Hill Quarry, Glastonbury, Hartford Co., Connecticut, USA
5.6km (3.5 miles) Hollister prospects (Hollister Quarry), South Glastonbury, Glastonbury, Hartford Co., Connecticut, USA
5.7km (3.5 miles) Husband Quarry, South Glastonbury, Glastonbury, Hartford Co., Connecticut, USA
6.3km (3.9 miles) Simpson Quarry (Wiarda Quarry), South Glastonbury, Glastonbury, Hartford Co., Connecticut, USA
6.4km (4.0 miles) Howe Quarry (Howe #1 Quarry; Huspband Quarry), South Glastonbury, Glastonbury, Hartford Co., Connecticut, USA
6.9km (4.3 miles) Case Quarries, Portland, Middlesex Co., Connecticut, USA
9.4km (5.8 miles) Pelton's Quarry, Portland, Middlesex Co., Connecticut, USA
10.7km (6.7 miles) Strickland Quarry (Eureka Quarry), Strickland pegmatite (Strickland-Cramer Quarry; Strickland-Cramer Mine; Strickland-Cramer Feldspar-Mica Quarries), Collins Hill, Portland, Middlesex Co., Connecticut, USA
11.4km (7.1 miles) Hale-Walker prospects, Collins Hill, Portland, Middlesex Co., Connecticut, USA
15.0km (9.3 miles) White Rocks Quarry (Consolidated Quarry), White Rock Mining District, Middletown, Middlesex Co., Connecticut, USA
 
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