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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Heulandite Subgroup from
O & G Southbury Quarry (Silliman Quarry; O & G No. 2 Quarry), Orenaug Hills, Woodbury, Litchfield County, Connecticut, USA


07415330017272024027203.jpg
Heulandite-Ca, etc.

O & G Southbury Quarry, Orenaug Hills, Woodbury, Litchfield County, Connecticut, USA
09751860017271986205102.jpg
Heulandite-Ca, etc.

O & G Southbury Quarry, Orenaug Hills, Woodbury, Litchfield County, Connecticut, USA
07098590017366290778670.jpg
Heulandite-Ca, etc.

O & G Southbury Quarry, Orenaug Hills, Woodbury, Litchfield County, Connecticut, USA
05337850017271986268407.jpg
Heulandite-Ca, etc.

O & G Southbury Quarry, Orenaug Hills, Woodbury, Litchfield County, Connecticut, USA
00024360017366290788474.jpg
Heulandite-Ca, etc.

O & G Southbury Quarry, Orenaug Hills, Woodbury, Litchfield County, Connecticut, USA
05206360017366290788633.jpg
Heulandite-Ca, etc.

O & G Southbury Quarry, Orenaug Hills, Woodbury, Litchfield County, Connecticut, USA
07098590017366290778670.jpg
Heulandite-Ca, etc.

O & G Southbury Quarry, Orenaug Hills, Woodbury, Litchfield County, Connecticut, USA
01596200017366290795380.jpg
Heulandite-Ca, etc.

O & G Southbury Quarry, Orenaug Hills, Woodbury, Litchfield County, Connecticut, USA
07415330017272024027203.jpg
Heulandite-Ca, etc.

O & G Southbury Quarry, Orenaug Hills, Woodbury, Litchfield County, Connecticut, USA
09751860017271986205102.jpg
Heulandite-Ca, etc.

O & G Southbury Quarry, Orenaug Hills, Woodbury, Litchfield County, Connecticut, USA
07709760017366290794781.jpg
Heulandite-Ca, etc.

O & G Southbury Quarry, Orenaug Hills, Woodbury, Litchfield County, Connecticut, USA
05337850017271986268407.jpg
Heulandite-Ca, etc.

O & G Southbury Quarry, Orenaug Hills, Woodbury, Litchfield County, Connecticut, USA
Locality type:Quarry
Classification
Species:'Heulandite Subgroup' (not an IMA approved species)
Formula:(Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O
Comments:Late forming crystals to 2 cm perched on quartz or prehnite with other zeolites and apophyllite.
Habit:coffin-shaped prisms
Colour:white to almond
Quality for species:Good crystals or rich for species - important (!)
Abundance at site:Common
Confirmation
Validity:Confirmed
Confirmation Methods:Visually Identified
Associated Minerals Based on Photo Data:
Quartz1
Pumpellyite Group1
Data
Mineral Data:Click here to view Heulandite Subgroup data
Locality Data:Click here to view O & G Southbury Quarry (Silliman Quarry; O & G No. 2 Quarry), Orenaug Hills, Woodbury, Litchfield County, Connecticut, USA
Photo GalleryView Gallery (3 photos)
Data Identifiers
Mindat Occurrence Record ID:657169
Long-form Identifier:1:3:657169:6
GUID (UUID V4):0
Nearest other occurrences of Heulandite Subgroup
5.8km (3.6 miles) ⓘNonnewaug River Industrial Park, Woodbury, Litchfield County, Connecticut, USA
14.1km (8.8 miles) ⓘRoute 73 quarry, Waterbury, New Haven County, Connecticut, USA
15.8km (9.8 miles) ⓘState Route 8 interchange 34 (formerly 37), Watertown, Litchfield County, Connecticut, USA
16.7km (10.4 miles) ⓘBlue Stone Quarry, Waterbury, New Haven County, Connecticut, USA
17.8km (11.1 miles) ⓘNew England Materials quarry, Monroe, Fairfield County, Connecticut, USA
18.6km (11.5 miles) ⓘWaterbury Road quarry, Thomaston, Litchfield County, Connecticut, USA
19.3km (12.0 miles) ⓘReynolds Bridge, Thomaston, Litchfield County, Connecticut, USA
23.0km (14.3 miles) ⓘNorth Street mall, Danbury, Fairfield County, Connecticut, USA
23.8km (14.8 miles) ⓘThomaston Dam railroad cut, Thomaston Dam, Thomaston, Litchfield County, Connecticut, USA
24.3km (15.1 miles) ⓘCheshire Traprock Quarry, Cheshire, New Haven County, Connecticut, USA
References
Weber, Marcelle H., Sullivan, Earle C. (1995) Connecticut Mineral Locality Index. Rocks & Minerals, 70 (6) 396-409 doi:10.1080/00357529.1995.11761569p.407
Garabedian, James A. (1998), Secondary Mineralization of Half-Moon Vesicles in the Mesozoic Basalt of the O&G#2 Quarry, Woodbury, Connecticut. University of Connecticut Master of Science Thesis.
 
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