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Mineralpedia Details for Fairfieldite

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Fairfieldite

Fairfieldite

Named for the type locality in the Fillow quarry in Fairfield County, Connecticut, USA. Additional localities for Fairfieldite include others in the United States including here in the Black Hills of South Dakota in the Tip Top, Bull Moose, Dan Patch, and Bob Ingersoll mines, as well as in Germany, Portugal, Spain, Russia, and a few others. Faifieldite is an uncommon mineral that occurs as an accessory in granite pegmatites.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/fairfieldite.pdf

Formula
Ca2Mn2+(PO4)2ยท2H2
Crystal System
Triclinic 
Crystal Habit
Foliated, Fibrous, Euhedral Crystals 
Cleavage
Perfect, Distinct, None 
Luster
Vitreous - Pearly 
Color
greenish white, white, light yellow 
Streak
white 
Class
Triclinic - Pinacoidal 
Fracture
Brittle - Uneven 
Hardness
3.5 
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Fairfieldite - Messelite from Tip Top mine, Custer Co., South Dakota, United States

Fairfieldite - Messelite
            from Tip Top mine, Custer Co., South Dakota, United States

white, platy or lamellar Fairfieldite - Messelite crystals to 1mm. At the Tip Top mine, Messelite occurs chiefly within altered Triphylite. Fairfieldite occurs within altered Beryl with green Roscherite. It also occurs with Whitlockite which typically occurs on Quartz. Paragenetically, this specimen leans towards Fairfieldite, the Manganese end member. Associated with brown Jahnsite (or possibly Roscherite) and Whitlockite.

Pearly white, bladed crystals to 4mm of Fairfieldite-Messelite.

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Fairfieldite from Foote mine, Cleveland Co., North Carolina, United States

Fairfieldite
            from Foote mine, Cleveland Co., North Carolina, United States

Frosted white spherical aggregates of Fairfieldite to 3mm.

White tabular Fairfieldite crystals from 4-6mm across totally covering face of specimen. 

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