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Clinochlore from
Old Mine Park (Old Tungsten Mine), Long Hill, Trumbull, Fairfield County, Connecticut, USA

Locality type:Park
Classification
Species:Clinochlore
Formula:Mg5Al(AlSi3O10)(OH)8
Formation:Primary, Secondary
Comments:Accessory in the marble or along contacts of cross-cutting veins with country rock, especially veins rich in calcite, albite and scapolite. In voids as micaceous aggregates up to 2 cm shaped like “double cones applied base to base” (Shepard, 1837) or generally spherical. Good albite and clinochlore crystals are found in small voids in these veins or where they formed in contact with chlorophane "in joints in marble in the bottom of the main pit, some narrow veins filled with a greenish black chlorite, which formed fine granular friable aggregates of small variously oriented crystals. Where free surfaces are present the chlorite exhibits the vermiform curved prismatic crystals commonly called helminthe forms. These free surfaces are usually coated with manganese oxide." (Shannon, 1921b). Called prochlorite in some old literature.
Habit:double cones applied base to base, curved to spherical aggregates of radiating plates
Colour:dark green to black
Quality for species:Good crystals or rich for species - important (!)
Abundance at site:Common
Confirmation
Validity:Believed Valid
References
References:Shannon, Earl V. (1921b), Some Minerals from the Old Tungsten Mine at Long Hill in Trumbull, Connecticut. Proceedings U.S. National Museum: 58(2348): 469-482.; Januzzi, Ronald E. (1994): Mineral Data Book - Western Connecticut and Environs. Mineralogical Press, Danbury, Connecticut.
Associated Minerals Based on Photo Data:
Quartz1 photo of Clinochlore associated with Quartz at this locality.
Baryte1 photo of Clinochlore associated with Baryte at this locality.
Albite1 photo of Clinochlore associated with Albite at this locality.
Data
Mineral Data:Click here to view Clinochlore data
Locality Data:Click here to view Old Mine Park (Old Tungsten Mine), Long Hill, Trumbull, Fairfield County, Connecticut, USA
Nearest other occurrences of Clinochlore
0.4km (0.2 miles) Old Mine Plaza construction site, Long Hill, Trumbull, Fairfield County, Connecticut, USA
0.7km (0.4 miles) State Route 111 road cuts, Long Hill, Trumbull, Fairfield County, Connecticut, USA
0.8km (0.5 miles) State Route 111 construction site, Long Hill, Trumbull, Fairfield County, Connecticut, USA
5.6km (3.5 miles) Trumbull, Fairfield County, Connecticut, USA
7.5km (4.7 miles) New England Materials quarry, Monroe, Fairfield County, Connecticut, USA
18.6km (11.6 miles) Quarry Road, Milford, New Haven Co., Connecticut, USA
18.9km (11.7 miles) Sky Ridge railroad cut, Hawleyville, Newtown, Fairfield County, Connecticut, USA
21.8km (13.6 miles) Agstone Company Limestone Quarry, Danbury, Fairfield County, Connecticut, USA
25.0km (15.6 miles) Green's Farm locality (Roxbury garnet mine; Roxbury Falls garnet mine; Garnet Hill), Roxbury, Litchfield Co., Connecticut, USA
32.4km (20.2 miles) Roxbury Iron Mine (Shepaug Iron Company Mine; Shepaug Spathic Iron and Steel Company Mine), Mine Hill (Ore Hill), Roxbury, Litchfield Co., Connecticut, USA
 
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