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Jahnsite-(Nafemg) with Leucophosphite

#40565

Jahnsite-(Nafemg) with Leucophosphite

#40565
Availability
Sold
Size
3.5 x 2 x 2 cm - Miniature 
Formula
NaFe3+Mg2Fe3+2(PO4)4(OH)2·8H2O (RRUFF)
Locality
Tip Top mine, Custer Co., South Dakota, United States
Tagged
phosphate , pegmatite mineral

Several yellow, twinned, prismatic crystals of Jahnsite-(NaFeMg), the most recent new mineral from the Tip Top mine. It is a portion of the material used for the study, author's material, discovered by myself. The crystals are about 0.5mm with orange tips. There are probably 7 or 8 crystals in the photos shown and a few more on the backside. It occurs with dark purple Leucophosphite, Laueite, and Dufrenite.

Type Locality, XRD Confirmed, EDS Confirmed, Author's Material

Jahnsite-(NaFeMg)

Formula
NaFe3+Mg2Fe3+2(PO4)4(OH)2·8H2
Crystal System
Monoclinic 
Crystal Habit
Prismatic, Striated 
Luster
Vitreous (Glassy) 
Color
yellow 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Brittle - Splintery 
Hardness

Data courtesy of Webmineral.

Special Info
Type Locality
Special Info
XRD Confirmed
Special Info
EDS Confirmed
Special Info
Author's Material

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