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0 item @ $0.00  

Todorokite

#PD30628

Todorokite

#PD30628
Availability
Sold
Size
6.5 x 4 x 7 cm - Sm Cabinet 
Formula
(Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12·3-4H2O (RRUFF)
Locality
Sierra Maestra, Oriente Province, Cuba
Tagged
Ore Minerals

Large piece of black-brown compact Todorokite in plumose patterns with an old Ward's label that says this specimen is from the pre Castro days, which would be before approx. 1959.
We found an old 1944 USGS publication on the deposits of the Oriente Province online (email us for link if interested) with some facts about the Manganese mining in Cuba. In this paper it mentions that in 1941 the Sierra Maestra Mn district produced 75,000 to 90,000 tons of ore with 40% or more Mn and total known reserves estimated at 300,000 tons with 40% Mn.

Todorokite

Formula
(Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12·3-4H2
Crystal System
Monoclinic 
Crystal Habit
Nodular, Reniform, Aggregates 
Cleavage
Perfect, Perfect, None 
Luster
Metallic - Dull 
Color
brownish black, gray, grayish black, dark brown, black 
Streak
dark brown 
Class
Monoclinic - Prismatic 
Hardness
1.5 

Data courtesy of Webmineral.

Collection
Phillips Collection

Other Sold

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