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Fairfieldite - Messelite with Hureaulite & Jahnsite-(CaMnMg)

#BN48044

Fairfieldite - Messelite with Hureaulite & Jahnsite-(CaMnMg)

#BN48044
Availability
Sold
Size
10 x 6.5 x 6 cm - Cabinet 
Formula
Ca2Mn2+(PO4)2·2H2O (RRUFF)
Locality
Tip Top mine, Custer Co., South Dakota, United States
Tagged
phosphate , pegmatite mineral

Larger cabinet specimen with a zone of white, thin, plates of Fairfieldite-Messelite crystals to 4-5mm, It occurs along the contact with the parent Triphylite-Heterosite matrix. Jahnsite occurs mostly on the Fairfieldite as nut brown, striated crytals to 1mm. It is the original Jahnsite-(CaMnMg).

Fairfieldite

Formula
Ca2Mn2+(PO4)2·2H2
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 

Data courtesy of Webmineral.

Collection
Dr. Buford Nichols Collection

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