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


05616370017362037999966.jpg
Prehnite, etc.

O & G Southbury Quarry, Orenaug Hills, Woodbury, Litchfield County, Connecticut, USA
02020580017411530972096.jpg
Prehnite

O & G Southbury Quarry, Orenaug Hills, Woodbury, Litchfield County, Connecticut, USA
08153120017272020775949.jpg
Prehnite

O & G Southbury Quarry, Orenaug Hills, Woodbury, Litchfield County, Connecticut, USA
09402080017412922933311.jpg
Prehnite, etc.

O & G Southbury Quarry, Orenaug Hills, Woodbury, Litchfield County, Connecticut, USA
04661250017412922946722.jpg
Prehnite, etc.

O & G Southbury Quarry, Orenaug Hills, Woodbury, Litchfield County, Connecticut, USA
06000730017411483654600.jpg
Prehnite

O & G Southbury Quarry, Orenaug Hills, Woodbury, Litchfield County, Connecticut, USA
08153120017272020775949.jpg
Prehnite

O & G Southbury Quarry, Orenaug Hills, Woodbury, Litchfield County, Connecticut, USA
03981240017272020796158.jpg
Prehnite, etc.

O & G Southbury Quarry, Orenaug Hills, Woodbury, Litchfield County, Connecticut, USA
02667420017362123672928.jpg
Prehnite, etc.

O & G Southbury Quarry, Orenaug Hills, Woodbury, Litchfield County, Connecticut, USA
02020580017411530972096.jpg
Prehnite

O & G Southbury Quarry, Orenaug Hills, Woodbury, Litchfield County, Connecticut, USA
08153120017272020775949.jpg
Prehnite

O & G Southbury Quarry, Orenaug Hills, Woodbury, Litchfield County, Connecticut, USA
03981240017272020796158.jpg
Prehnite, etc.

O & G Southbury Quarry, Orenaug Hills, Woodbury, Litchfield County, Connecticut, USA
Locality type:Quarry
Classification
Species:Prehnite
Formula:Ca2Al2Si3O10(OH)2
Comments:Mostly lining gas vesicles, but the best specimens are floaters known as "hearts" that formed as replacements over now dissolved datolite. These can reach over 15 cm.
Habit:botryoidal to spherical aggregates of tabular crystals
Colour:white, pale yellow to green to blue-green
Quality for species:Excellent - world class for species or very significant. (!!)
Abundance at site:Very common
Confirmation
Validity:Confirmed
Confirmation Methods:Visually Identified
Associated Minerals Based on Photo Data:
Calcite113
Fluorapophyllite-(K)54
Pumpellyite Group49
Datolite26
Quartz26
Sphalerite19
Anhydrite13
Babingtonite12
Laumontite11
Pyrite8
Analcime6
Ferrosaponite6
Goethite3
Heulandite-Ca2
Apophyllite Group1
Pumpellyite-(Mg)1
Pumpellyite Subgroup1
Chabazite1
Data
Mineral Data:Click here to view Prehnite 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 (142 photos)
Data Identifiers
Mindat Occurrence Record ID:19407
Long-form Identifier:1:3:19407:1
GUID (UUID V4):0
Nearest other occurrences of Prehnite
1.8km (1.1 miles) ⓘSawteeth Ridge, Southbury, New Haven County, Connecticut, USA
2.2km (1.3 miles) ⓘBates' Rock Road, Southbury, New Haven County, Connecticut, USA
3.6km (2.2 miles) ⓘO & G Woodbury Traprock Quarry (Orenaug Quarry; O & G No. 1 Quarry), Orenaug Hills, Woodbury, Litchfield County, Connecticut, USA
12.4km (7.7 miles) ⓘInterstate 84 road cuts (Route 6A bypass), Newtown, Fairfield 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
24.8km (15.4 miles) ⓘOld Mine Plaza construction site, Long Hill, Trumbull, Fairfield County, Connecticut, USA
27.1km (16.8 miles) ⓘBarcla Quarry (Clark-Barrone Quarry), Woodbridge, New Haven County, Connecticut, USA
29.5km (18.3 miles) ⓘPine Rock Quarry (Farnham Quarry), Hamden, New Haven County, Connecticut, USA
References
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.
Betts, John (n.d.) John Betts website listing.
 
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