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Simplotite on Coffinite

#BAC63183
SOLD
Simplotite from Uravan Mineral Belt, Montrose Co., Valencia Co., New Mexico, United States - BAC63183
Simplotite from Uravan Mineral Belt, Montrose Co., Valencia Co., New Mexico, United States - BAC63183

Simplotite on Coffinite

#BAC63183
Availability
Sold
Size
3.5 x 2.5 x 1.3 cm - Miniature 
Formula
CaV4+4O9·5H2O (RRUFF)
Locality
Uravan Mineral Belt, Montrose Co., Valencia Co., New Mexico, United States
Tagged
vanadium

Golden brown, very thin plates of Simplotite along one of the edges of this specimen. These crystals look a lot like Sincosite crystals, and it's no wonder why as the composition is nearly the same. Sincosite's formula is Ca(VO)2(PO4)2 · 5H2O, which is similar to Simplotite, although the crystal systems are different. Simplotite is monoclinc whereas Sincosite is tetragonal. Sincosite can also occur as golden brown crystals, just like this specimen. These are just my observations and probably has no basis as to why they look alike.

Simplotite

Formula
CaV4+4O9·5H2O 
Crystal System
Monoclinic 
Crystal Habit
Micaceous, Platy 
Cleavage
Perfect, None, None 
Luster
Vitreous (Glassy) 
Color
greenish black, dark green, black 
Streak
brownish black 
Class
Monoclinic - Prismatic 
Hardness
1 

Data courtesy of Webmineral.

Collection
William & Anne Cook Collection
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Other Available Simplotite
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