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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Bitumen from
Roncari Quarry, East Granby, Hartford County, Connecticut, USA


06882420017841441318823.jpg
Bitumen, etc.

Roncari Quarry, East Granby, Hartford County, Connecticut, USA
09347560017368219161592.jpg
Bitumen, etc.

Roncari Quarry, East Granby, Hartford County, Connecticut, USA
06882420017841441318823.jpg
Bitumen, etc.

Roncari Quarry, East Granby, Hartford County, Connecticut, USA
09347560017368219161592.jpg
Bitumen, etc.

Roncari Quarry, East Granby, Hartford County, Connecticut, USA
06882420017841441318823.jpg
Bitumen, etc.

Roncari Quarry, East Granby, Hartford County, Connecticut, USA
09197960017368219175609.jpg
Bitumen, etc.

Roncari Quarry, East Granby, Hartford County, Connecticut, USA
Locality type:Quarry
Classification
Species:Petroleum var: Bitumen
Formation:Secondary
Comments:Brittle, glassy, conchoidal fracture with sharp edges. Found in faults and pockets. Dessicated residue from the upward migration of crude oil from stratigraphically lower, petroleum-rich black shales in the Shuttle Meadow Formation.
Habit:amorphous
Colour:black
Abundance at site:Rare
Confirmation
Validity:Confirmed
Confirmation Methods:Visually Identified
Associated Minerals Based on Photo Data:
Calcite2
Datolite2
Prehnite1
Data
Mineral Data:Click here to view Bitumen data
Locality Data:Click here to view Roncari Quarry, East Granby, Hartford County, Connecticut, USA
Photo GalleryView Gallery (2 photos)
Data Identifiers
Mindat Occurrence Record ID:896374
Long-form Identifier:1:3:896374:1
GUID (UUID V4):0
Nearest other occurrences of Bitumen
0.9km (0.6 miles) ⓘState Route 20 road cut, East Granby, Hartford County, Connecticut, USA
22.0km (13.7 miles) ⓘHampden quarry, West Springfield, Hampden County, Massachusetts, USA
24.7km (15.3 miles) ⓘBalf Quarry, Newington, Hartford County, Connecticut, USA
25.1km (15.6 miles) ⓘState Route 9 & State Route 71 Interchange, New Britain, Hartford County, Connecticut, USA
25.5km (15.9 miles) ⓘThe Woodlands, Newington, Hartford County, Connecticut, USA
27.0km (16.8 miles) ⓘArute Field, New Britain, Hartford County, Connecticut, USA
30.2km (18.8 miles) ⓘJourney Road quarry, Plainville, Hartford County, Connecticut, USA
30.2km (18.8 miles) ⓘInterstate 91 and Interstate 291 interchange, Wethersfield, Hartford County, Connecticut, USA
30.3km (18.8 miles) ⓘTilcon trap rock quarry, Plainville, Hartford County, Connecticut, USA
30.6km (19.0 miles) ⓘRocky Hill Quarry, Rocky Hill, Hartford County, Connecticut, USA
References
Hubert, John F., Paul E. Feshbach-Meriney and Michael A. Smith. (1992). The Triassic-Jurassic Hartford Rift Basin, Connecticut and Massachusetts: Evolution, Sandstone Diagenesis, and Hydrocarbon History. AAPG Bulletin: 76(11).
Walter, Michael R.; Dixon, Kevin (2026) Minerals from the Roncari Quarry, East Granby, Hartford County, Connecticut. Rocks & Minerals, 101 (2). doi:10.1080/00357529.2026.2581546
 
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