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


Locality type:Outcrop
Classification
Species:Spessartine
Formula:Mn32+Al2(SiO4)3
Comments:Crystals are translucent and partly gemmy, some perfectly formed, reached up to 15 cm across. Seybert's (1823) analysis showed twice as much Mn oxide as Fe oxide, unusual as most garnets from the Middletown pegmatite district are almandine.
Habit:Dodecahedral
Colour:blood red
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:
Chrysoberyl28
Quartz25
- var Smoky Quartz4
Albite24
Columbite-(Fe)8
Talc5
Fahlunite4
Schorl4
Beryl3
Sillimanite3
Zircon2
Data
Mineral Data:Click here to view Spessartine data
Locality Data:Click here to view Chrysoberyl locality, Haddam, Middlesex County, Connecticut, USA
Data Identifiers
Mindat Occurrence Record ID:660302
Long-form Identifier:1:3:660302:1
GUID (UUID V4):0
Nearest other occurrences of Spessartine
1.5km (0.9 miles) ⓘGillette Quarry (J-J Mine; Haddam Neck Quarry), Haddam Neck, Haddam, Middlesex County, Connecticut, USA
1.6km (1.0 miles) ⓘJail Hill Road locality (Jail Hill Quarry), Haddam, Middlesex County, Connecticut, USA
2.9km (1.8 miles) ⓘCivilian Conservation Corps prospect (CCC prospect; Cook columbite prospect), Haddam, Middlesex County, Connecticut, USA
3.5km (2.2 miles) ⓘHewitt Gem Quarry (Herb's Gem Quarry; Sawmill Quarry), Haddam, Middlesex County, Connecticut, USA
3.7km (2.3 miles) ⓘAnderson No. 1 Mica Mine, East Hampton, Middlesex County, Connecticut, USA
7.0km (4.3 miles) ⓘSlocum prospect, East Hampton, Middlesex County, Connecticut, USA
7.5km (4.7 miles) ⓘDripps Road, Middletown, Middlesex County, Connecticut, USA
12.4km (7.7 miles) ⓘNathan Hall Quarry, East Hampton, Middlesex County, Connecticut, USA
12.6km (7.8 miles) ⓘHale-Walker prospects, Collins Hill, Portland, Middlesex County, Connecticut, USA
12.6km (7.9 miles) ⓘState Forest Quarry No. 1, East Hampton, Middlesex County, Connecticut, USA
References
Seybert, Henry (1823): Analysis of a manganesian garnet from Haddam. American Journal of Science s. 1, v. 6, p. 155-57.
 
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