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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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Axinite-(Fe) from
State Route 9 rock cuts, Haddam, Middlesex County, Connecticut, USA


Classification
Species:Axinite-(Fe)
Formula:Ca2Fe2+Al2BSi4O15OH
Formation:Primary
Comments:According to Schooner, occurs with tan titanite and pink feldspar. A specimen in the Bill Henderson micromount collection at Yale Peabody Museum consists of white albite matrix hosting a small void partially filled with purplish-brown, glassy axinite crystals (mislabeled as titanite) and tiny vermiform chlorite.
Habit:axe head shaped
Colour:lavender, purplish brown
Abundance at site:Rare
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Axinite-(Fe) data
Locality Data:Click here to view State Route 9 rock cuts, Haddam, Middlesex County, Connecticut, USA
Data Identifiers
Mindat Occurrence Record ID:920678
Long-form Identifier:1:3:920678:6
GUID (UUID V4):0
Nearest other occurrences of Axinite-(Fe)
23.1km (14.3 miles) ⓘState Route 2 roadcut, Marlborough, Hartford County, Connecticut, USA
52.5km (32.6 miles) ⓘState Routes 8 and 222 interchange, Thomaston, Litchfield County, Connecticut, USA
61.7km (38.3 miles) ⓘOld Mine Plaza construction site, Long Hill, Trumbull, Fairfield County, Connecticut, USA
93.6km (58.1 miles) ⓘTilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA
References
Yale Peabody Museum - Bill Henderson micromount collection
Schooner, Richard. (circa 1990), Untitled manuscript on central Connecticut minerals.
 
and/or  
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