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Robertsite with apatite

#55520
SOLD
Robertsite from Tip Top mine, Custer Co., South Dakota, United States - 55520
Robertsite from Tip Top mine, Custer Co., South Dakota, United States - 55520

Robertsite with apatite

#55520
Availability
Sold
Size
6 x 5 x 5 cm - Sm Cabinet 
Formula
Ca2Mn3+3O2(PO4)3·3H2O (RRUFF)
Locality
Tip Top mine, Custer Co., South Dakota, United States
Tagged
phosphate , pegmatite mineral

The orange arrow points to an area with platy, dark red Robertsite crystals to 3 maybe 4mm. The blue points to an area of lilac carbonate apatite. The Robertsite was verified by Raman at the RRUFF lab and also was used for structure refinement. It is much different than most other Robertsite specimens, which usually form minute rounded crystal aggregates or pseudo-hexagonal prismatic crystals.

Type Locality, XRD Confirmed, EDS Confirmed, Raman

Robertsite

Formula
Ca2Mn3+3O2(PO4)3·3H2O 
Crystal System
Monoclinic 
Crystal Habit
Aggregates, Felted 
Cleavage
Good, None, None 
Luster
Adamantine 
Color
blood red, brownish black, dark red, reddish brown, black 
Streak
brown 
Class
Monoclinic - Prismatic 
Hardness
3.5 

Data courtesy of Webmineral.

Special Info
Type Locality
Special Info
XRD Confirmed
Special Info
EDS Confirmed
Special Info
Raman
Mineralpedia
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On Dakota Matrix
Previously Sold Robertsite
On Dakota Matrix
Other Available Robertsite
WebMineral
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Mindat
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