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Rare Earth Minerals

Thursday, 27 February 2020 12:00 PM

Introducing the "Rare Earth Minerals" gallery which is part of our Special Edition galleries. This gallery contains mineral specimens for sale including thulium oxide, tombarthite-(y), tveitite-(y), vastmanlandite-(ce), wakefieldite-(ce), and zhonghuacerite-(ce) and more from places like no locality, Høgtveit, Evje og Hornnes, Aust-Agder, Norway, Rovgora Mt., W. Keivy, Kola Peninsula, Russia, Malmkärra mine, Norberg, Västmanland, Sweden, Yellow Lake, Olalla, British Columbia, Canada, and Bayan Obo deposit, Inner Mongolia, China.

Thulium Oxide

#52269
Locality
no locality 
Formula
Tm2O3 
Availability
Available
Price
$33.00
Size
4 x 1 x 1 cm - Miniature 
Tagged
REE oxide  

Small vial of Thulium oxide.


Tombarthite-(Y)

#PD52262
Locality
Høgtveit, Evje og Hornnes, Aust-Agder, Norway 
Formula
Y4(Si,H4)4O12(OH)4 
Availability
Sold
Size
6 x 4 x 2.5 cm - Sm Cabinet 
Tagged
REE mineral  
Special Info
Discredited 

Tombarthite-(Y) has been discredited and redefined as a mixture of thalénite-(Y), xenotime-(Y) and kainosite-(Y). 


Tombarthite-(Y)

Formula
Y4(Si,H4)4O12(OH)4 
Crystal System
Monoclinic 
Crystal Habit
Metamict, Massive 
Cleavage
None, None, None 
Luster
Earthy (Dull) 
Color
brownish black 
Class
Monoclinic - Prismatic 
Fracture
Conchoidal 
Hardness
5-6 
Collection
Don Phillips Collection
Special Info
Discredited

Tveitite-(Y)

#41398
Locality
Rovgora Mt., W. Keivy, Kola Peninsula, Russia 
Formula
(Y,Na)6(Ca,Na,Y)12(Ca,Na)F42 
Availability
Sold
Size
2.5 x 1 x 1 cm - Thumbnail 
Tagged
REE mineral  
Special Info
XRD Confirmed 
Special Info
EDS Confirmed 

Tveitite-(Y) is shown at the red arrow and it is a white to yellowish white to pinkish, nondescript mineral. It is identified by Dr. Igor Pekov. Comes with a small vial with a few grams of powdered yttrium oxide.


Tveitite-(Y)

Formula
(Y,Na)6(Ca,Na,Y)12(Ca,Na)F42 
Crystal System
Monoclinic 
Luster
Greasy (Oily) 
Color
white, light yellow 
Streak
white 
Class
Monoclinic 
Hardness
Special Info
XRD Confirmed
Special Info
EDS Confirmed

Vastmanlandite-(Ce)

with Fluorbritholite-(Ce) - #43806
Locality
Malmkärra mine, Norberg, Västmanland, Sweden 
Formula
Ce3CaMg2Al2Si5O19(OH)2
Availability
Sold
Size
2.5 x 1.5 x 1.5 cm - Thumbnail 
Tagged
REE mineral  
Special Info
Type Locality 

This is a mixture of two very rare minerals containing cerium The Vastmanlandite-(Ce) is black and dull and mixed with brick red to pink Fluorbritholite. 


Vastmanlandite-(Ce)

Formula
Ce3CaMg2Al2Si5O19(OH)2
Crystal System
Monoclinic 
Crystal Habit
Anhedral Grains 
Cleavage
Good, None, None 
Luster
Vitreous (Glassy) 
Color
dark brown 
Streak
yellowish gray 
Class
Monoclinic - Prismatic 
Fracture
Brittle - Uneven 
Hardness
Special Info
Type Locality
SOLD
Wakefieldite-(Ce) - PD52222
Wakefieldite-(Ce) - PD52222

Wakefieldite-(Ce)

#PD52222
Locality
Yellow Lake, Olalla, British Columbia, Canada 
Formula
CeVO4 
Availability
Sold
Size
1.5 x 1 x 0.8 cm - Thumbnail 
Tagged
REE mineral , vanadium  

A square prismatic 1mm black crystal  in tiny vug. Wakefieldite-(Ce) is rare worldwide and found only in eight localities (Mindat). Wakefieldite-(Ce) is a cerium vanadate.

Cerium is the the most abundant member of the lanthanides (atomic numbers 57-71) and is more abundant in the Earth's crust than tin. It was once used for lapidary polishing agents, catalytic convertors, and in glass and ceramics. One hundred grams of metallic cerium will cost you $57.


Wakefieldite-(Ce)

Formula
CeVO4 
Crystal System
Tetragonal 
Crystal Habit
Square, Prismatic 
Cleavage
None, None, None 
Luster
Vitreous - Adamantine 
Color
dark red, black 
Streak
rusty brown 
Class
Tetragonal - Ditetragonal Dipyramidal 
Hardness
4.5 
Collection
Don Phillips Collection

Zhonghuacerite-(Ce)

#52223
Locality
Bayan Obo deposit, Inner Mongolia, China 
Formula
Ba2Ce(CO3)3
Availability
Sold
Size
3.5 x 3 x 2 cm - Miniature 
Tagged
carbonate , REE mineral  

Brownish crystal grains with fluorite.


Zhonghuacerite-(Ce)

Formula
Ba2Ce(CO3)3F 
Crystal System
Monoclinic 
Crystal Habit
Aggregates 
Luster
Vitreous - Resinous 
Color
yellow, light brown 
Streak
white 
Class
Monoclinic - Prismatic 
Hardness
4.5 

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