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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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Fluorapatite from
Anderson No. 1 Mica Mine, East Hampton, Middlesex County, Connecticut, USA


02807140017367013046333.jpg
Fluorapatite

Anderson No. 1 Mica Mine, East Hampton, Middlesex County, Connecticut, USA
02807140017367013046333.jpg
Fluorapatite

Anderson No. 1 Mica Mine, East Hampton, Middlesex County, Connecticut, USA
05229560017361102562621.jpg
Fluorapatite

Anderson No. 1 Mica Mine, East Hampton, Middlesex County, Connecticut, USA
Locality type:Mine
Classification
Species:Fluorapatite
Formula:Ca5(PO4)3F
Formation:Primary, Secondary
Comments:As subhedral crystals or masses to several cm from the intermediate cleavlandite-rich zones; as intergrowths with garnet and/or blue elbaite. Schooner (circa 1990) reports that "a few large flattened crystals have been found, often embedded in massive garnet; a strange blue variety, embedded in lepidolite, was X-rayed for confirmation."
Habit:massive to subhedral
Colour:light gray-green to dark green, pale blue
Luminescent properties:yellow
Quality for species:Poor for species, only of interest for locality collectors. (#)
Abundance at site:Common
Confirmation
Validity:Confirmed
Confirmation Methods:Visual (Fluorescence)
Associated Minerals Based on Photo Data:
Albite4
- var Cleavelandite4
Spessartine3
Lepidolite2
Xanthoxenite1
Columbite-(Fe)-Columbite-(Mn) Series1
Elbaite1
Beryl1
Quartz1
- var Smoky Quartz1
Data
Mineral Data:Click here to view Fluorapatite data
Locality Data:Click here to view Anderson No. 1 Mica Mine, East Hampton, Middlesex County, Connecticut, USA
Photo GalleryView Gallery (2 photos)
Data Identifiers
Mindat Occurrence Record ID:37802
Long-form Identifier:1:3:37802:6
GUID (UUID V4):0
Nearest other occurrences of Fluorapatite
0.1km (0.1 miles) ⓘAnderson No. 2 Mica Mine, East Hampton, Middlesex County, Connecticut, USA
0.4km (0.3 miles) ⓘEnegren Mica Mine, East Hampton, Middlesex County, Connecticut, USA
0.9km (0.6 miles) ⓘRock Landing Quarry (Capt. Rohrback Quarry), Haddam Neck, Haddam, Middlesex County, Connecticut, USA
1.5km (0.9 miles) ⓘHurd State Park quarries, East Hampton, Middlesex County, Connecticut, USA
1.6km (1.0 miles) ⓘWorth and Selden Quarries (Victoria Quarry), East Hampton, Middlesex County, Connecticut, USA
2.8km (1.7 miles) ⓘGillette Quarry (J-J Mine; Haddam Neck Quarry), Haddam Neck, Haddam, Middlesex County, Connecticut, USA
3.3km (2.1 miles) ⓘQuarry Hill (Brainerd Quarries; Shailor Quarries), Haddam Neck, Haddam, Middlesex County, Connecticut, USA
3.4km (2.1 miles) ⓘMarkham Mica Quarry, Hog Hill, East Hampton, Middlesex County, Connecticut, USA
4.6km (2.8 miles) ⓘSlocum prospect, East Hampton, Middlesex County, Connecticut, USA
5.1km (3.2 miles) ⓘJail Hill Road locality (Jail Hill Quarry), Haddam, Middlesex County, Connecticut, USA
References
USGS Professional Paper 255.
Schooner, Richard. (circa 1990), Untitled manuscript on central Connecticut mineralogy.
Cameron, Eugene N., Larrabee, David M., McNair, Andrew H., Page, James J., Stewart, Glen W., Shainin, Vincent E. (1954) Pegmatite Investigations, 1942-45, in New England. Geological Survey Professional Paper 255. US Geological Survey doi:10.3133/pp255
London, David (1985) Pegmatites of the Middletown District, Connecticut, in Guidebook for field trips in Connecticut and adjacent areas of New York and Rhode Island: New England Intercollegiate Geological Conference 77th annual meeting, Yale University, New Haven, Connecticut, October 4-6, 1985. Guidebook 6, State Geological and Natural History Survey of Connecticut. 509-533
 
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