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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Anthophyllite from
Amphibole-tourmaline-magnetite locality, Haddam Neck, Haddam, Middlesex County, Connecticut, USA


01493700017366733735957.jpg
Anthophyllite

Amphibole-tourmaline-magnetite locality, Haddam Neck, Haddam, Middlesex County, Connecticut, USA
01493700017366733735957.jpg
Anthophyllite

Amphibole-tourmaline-magnetite locality, Haddam Neck, Haddam, Middlesex County, Connecticut, USA
03818480017366733743379.jpg
Anthophyllite

Amphibole-tourmaline-magnetite locality, Haddam Neck, Haddam, Middlesex County, Connecticut, USA
Locality type:Outcrop
Classification
Species:Anthophyllite
Formula:◻Mg2Mg5(Si8O22)(OH)2
Comments:As feathery crystal groups aligned with foliation, crystals typically up to 6 cm long. TEM-EDS analyses were conducted on typical amphiboles in the Middletown Formation. These all proved to be anthophyllite.
Habit:elongated, flattened prisms
Colour:black to dark green
Quality for species:Good crystals or rich for species - important (!)
Abundance at site:Very common
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Tourmaline1
Magnetite1
Data
Mineral Data:Click here to view Anthophyllite data
Locality Data:Click here to view Amphibole-tourmaline-magnetite locality, Haddam Neck, Haddam, Middlesex County, Connecticut, USA
Data Identifiers
Mindat Occurrence Record ID:920479
Long-form Identifier:1:3:920479:9
GUID (UUID V4):0
Nearest other occurrences of Anthophyllite
1.6km (1.0 miles) ⓘHaddam Neck, Haddam, Middlesex County, Connecticut, USA
3.9km (2.4 miles) ⓘSandy Hill, Haddam, Middlesex County, Connecticut, USA
4.6km (2.9 miles) ⓘTimms Hill (Tim's Hill; Iolite Hill), Haddam, Middlesex County, Connecticut, USA
6.1km (3.8 miles) ⓘState Route 9 Interchange 13 - Beaver Meadow Road, Haddam, Middlesex County, Connecticut, USA
17.8km (11.1 miles) ⓘHaynes Deep River Quarry, Deep River, Middlesex County, Connecticut, USA
52.4km (32.6 miles) ⓘSatan's Kingdom talc deposits, New Hartford, Litchfield County, Connecticut, USA
94.3km (58.6 miles) ⓘBrown's Quarry, Town of Kent, Putnam County, New York, USA
94.6km (58.8 miles) ⓘPelham asbestos mine, Pelham, Hampshire County, Massachusetts, USA
References
Schooner, Richard. (circa 1985), Untitled manuscript on central Connecticut mineralogy.
 
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