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Jahnsite-(Camnmg)

#BN47685
SOLD
Jahnsite-(CaMnMg) from Tip Top mine, Custer Co., South Dakota, United States - BN47685
Jahnsite-(CaMnMg) from Tip Top mine, Custer Co., South Dakota, United States - BN47685

Jahnsite-(Camnmg)

#BN47685
Availability
Sold
Size
6 x 3 x 0.5 cm - Sm Cabinet 
Formula
CaMn2+Mg2Fe3+2(PO4)4(OH)2·8H2O (RRUFF)
Locality
Tip Top mine, Custer Co., South Dakota, United States
Tagged
phosphate , pegmatite mineral

There was a time in the distant past, when there was only one type of Jahnsite. There was no qualification to get into the Jahnsite club. These days there many Jahnsites, like the shrimp dishes in Forrest Gump. You never know what you'll get in a box of Jahnsite. You can look on Mindat for the types. Many of them occur at the Tip Top. We discovered a new one several years ago. This Jahnsite is the original, described by Paul Moore in the 1960's. It is a funny nut brown and striated. These are distinct, nice crystals to 4mm long, which is long for Jahnsite-(CaMnMg). The matrix is Quartz.

Type Locality

Jahnsite-(CaMnMg)

Formula
CaMn2+Mg2Fe3+2(PO4)4(OH)2·8H2O 
Crystal System
Monoclinic 
Cleavage
Good, None, None 
Luster
Vitreous - Adamantine 
Color
brown, purplish brown, yellow, yellow orange, greenish yellow 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Brittle 
Hardness
4 

Data courtesy of Webmineral.

Collection
Dr. Buford Nichols Collection
Special Info
Type Locality
Mineralpedia
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On Dakota Matrix
Previously Sold Jahnsite-(Camnmg)
On Dakota Matrix
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WebMineral
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Mindat
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