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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Apophyllite Group from
Thomaston Dam railroad cut, Thomaston Dam, Thomaston, Litchfield County, Connecticut, USA


Locality type:Road Cutting
Classification
Species:'Apophyllite Group' (not an IMA approved species)
Formula:AB4[Si8O20]X · 8H2O
Formation:Primary
Comments:In hydrothermal fault veins with chabazite, stilbite, quartz, pyrite, and calcite.
Habit:tabular to pyramidal
Colour:off-white to yellow
Abundance at site:Rare
Confirmation
Validity:Confirmed
Confirmation Methods:Visually Identified
Data
Mineral Data:Click here to view Apophyllite Group data
Locality Data:Click here to view Thomaston Dam railroad cut, Thomaston Dam, Thomaston, Litchfield County, Connecticut, USA
Data Identifiers
Mindat Occurrence Record ID:96344
Long-form Identifier:1:3:96344:4
GUID (UUID V4):0
Nearest other occurrences of Apophyllite Group
20.0km (12.4 miles) ⓘPlainville Trap Rock Quarry (Tilcon New Britain Quarry), Plainville, Hartford County, Connecticut, USA
20.3km (12.6 miles) ⓘO & G Woodbury Traprock Quarry (Orenaug Quarry; O & G No. 1 Quarry), Orenaug Hills, Woodbury, Litchfield County, Connecticut, USA
23.4km (14.5 miles) ⓘCheshire Traprock Quarry, Cheshire, New Haven County, Connecticut, USA
23.8km (14.8 miles) ⓘO & G Southbury Quarry (Silliman Quarry; O & G No. 2 Quarry), Orenaug Hills, Woodbury, Litchfield County, Connecticut, USA
24.7km (15.4 miles) ⓘState Route 44 road cut, Avon, Hartford County, Connecticut, USA
25.5km (15.8 miles) ⓘSawteeth Ridge, Southbury, New Haven County, Connecticut, USA
32.8km (20.4 miles) ⓘRoute 66 outcrops, Middlefield, Middlesex County, Connecticut, USA
36.2km (22.5 miles) ⓘInterstate 84 road cuts (Route 6A bypass), Newtown, Fairfield County, Connecticut, USA
37.8km (23.5 miles) ⓘReed's Gap Quarry (New Haven Trap Rock quarry; Tilcon Durham quarry), Durham, Middlesex County, Connecticut, USA
38.1km (23.7 miles) ⓘRoncari Quarry, East Granby, Hartford County, Connecticut, USA
References
Januzzi, Ron E., Seaman, David M. (1976) Mineral Localities of Connecticut and Southeastern New York State and Pegmatite Minerals of the World. The Mineralogical Press, Danbury, Connecticut, USA.
 
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