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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Siderite from
Strickland Quarry, Strickland pegmatite, Collins Hill, Portland, Middlesex County, Connecticut, USA


Locality type:Quarry
Classification
Species:Siderite
Formula:FeCO3
Formation:Secondary
Comments:Microscopic crystals with fluorite and analcime, SEM-EDS analysis shows some Mn impurity. This is consistent with Schooner's claim that rhodochrosite from altered lithiophilite grades into siderite.
Habit:curved rhombohedra
Colour:tan
Abundance at site:Very Rare
Confirmation
Validity:Confirmed
Confirmation Methods:SEM-EDS
Associated Minerals Based on Photo Data:
Analcime8
Fluorite7
Data
Mineral Data:Click here to view Siderite data
Locality Data:Click here to view Strickland Quarry, Strickland pegmatite, Collins Hill, Portland, Middlesex County, Connecticut, USA
Data Identifiers
Mindat Occurrence Record ID:96244
Long-form Identifier:1:3:96244:5
GUID (UUID V4):0
Nearest other occurrences of Siderite
3.8km (2.3 miles) State Forest Quarry No. 2, Cobalt, East Hampton, Middlesex County, Connecticut, USA
3.8km (2.4 miles) Great Hill cobalt mines, Cobalt, East Hampton, Middlesex County, Connecticut, USA
9.3km (5.7 miles) Linkpot cut, Airline Railroad, East Hampton, Middlesex County, Connecticut, USA
11.0km (6.8 miles) Rock Landing Quarry (Capt. Rohrback Quarry), Haddam Neck, Haddam, Middlesex County, Connecticut, USA
16.4km (10.2 miles) State Route 9 - Ellis Street and State Route 72 interchanges (State Route 72 roadcut), New Britain, Hartford County, Connecticut, USA
17.3km (10.7 miles) State Route 9 rock cuts, Haddam, Middlesex County, Connecticut, USA
18.1km (11.2 miles) Arute Field, New Britain, Hartford County, Connecticut, USA
18.2km (11.3 miles) 135 Fenn Road, Newington, Hartford County, Connecticut, USA
18.3km (11.4 miles) Fenn Road, Newington, Hartford County, Connecticut, USA
18.4km (11.5 miles) The Woodlands, Newington, Hartford County, Connecticut, USA
References
 
and/or  
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