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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Cordierite from
Chrysoberyl locality, Haddam, Middlesex County, Connecticut, USA


01872020017368875001867.jpg
Cordierite, etc.

Chrysoberyl locality, Haddam, Middlesex County, Connecticut, USA
01872020017368875001867.jpg
Cordierite, etc.

Chrysoberyl locality, Haddam, Middlesex County, Connecticut, USA
08397890017272041559558.jpg
Cordierite, etc.

Chrysoberyl locality, Haddam, Middlesex County, Connecticut, USA
Locality type:Outcrop
Classification
Species:Cordierite
Formula:Mg2Al4Si5O18
Comments:Shepard (1837) referring to it as "iolite" writes: "It occurs in large massive individuals, having one very eminent cleavage. Its colors are various shades of blue and green, the former predominating; it is transparent in spots, and possessed of dichroism. It is obtained at this place with some difficulty, and does not promise to be abundant." Much of it is altered to what Shepard (1841) refers to as "pinite" but more likely "fahlunite" similar to that found at Tim's Hill.
Habit:massive to subhedral short prisms
Colour:blue to green
Quality for species:Poor for species, only of interest for locality collectors. (#)
Abundance at site:Rare
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Quartz2
Albite2
Chrysoberyl1
Fahlunite1
Data
Mineral Data:Click here to view Cordierite data
Locality Data:Click here to view Chrysoberyl locality, Haddam, Middlesex County, Connecticut, USA
Data Identifiers
Mindat Occurrence Record ID:660292
Long-form Identifier:1:3:660292:5
GUID (UUID V4):0
Nearest other occurrences of Cordierite
0.6km (0.4 miles) ⓘThulite locality, Haddam, Middlesex County, Connecticut, USA
1.4km (0.9 miles) ⓘTimms Hill (Tim's Hill; Iolite Hill), Haddam, Middlesex County, Connecticut, USA
3.0km (1.8 miles) ⓘState Route 9 Interchange 13 - Beaver Meadow Road, Haddam, Middlesex County, Connecticut, USA
3.2km (2.0 miles) ⓘAmphibole-tourmaline-magnetite locality, Haddam Neck, Haddam, Middlesex County, Connecticut, USA
10.8km (6.7 miles) ⓘGreat Hill cobalt mines, Cobalt, East Hampton, Middlesex County, Connecticut, USA
13.4km (8.4 miles) ⓘStrickland Quarry, Strickland pegmatite, Collins Hill, Portland, Middlesex County, Connecticut, USA
13.5km (8.4 miles) ⓘSchoonmaker Mine, Strickland pegmatite, Collins Hill, Portland, Middlesex County, Connecticut, USA
16.5km (10.3 miles) ⓘCase Quarries, Portland, Middlesex County, Connecticut, USA
16.5km (10.3 miles) ⓘCase Quarry No. 1, Case Quarries, Portland, Middlesex County, Connecticut, USA
23.5km (14.6 miles) ⓘHungry Hill mineral occurrence, Guilford, New Haven County, Connecticut, USA
References
Shepard, Charles Upham (1837) A Report on the Geological Survey of Connecticut. Geological Survey of Connecticut.
 
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