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Rare Earth Minerals

Tuesday, 19 April 2022 02:30 PM

Introducing the "Rare Earth Minerals" gallery which is part of our Special Edition galleries. This gallery contains mineral specimens for sale including churchite-(y), davidite-(la), euxenite-(y) and more from places like Nitzelbuch mine, Auerbach, Upper Palatinate, Bavaria, Germany, Kelly Bank mine, Rockbridge Co., Virginia, United States, Pandora prospect, Quijotoa dist., Pima County, Arizona, United States, Kirumba Complex, Bwito, Rutshuru, North Kivu, DR Congo, Crystal No. 8 mine, Chaffee County, Colorado, United States, and Kingman Feldspar mine, Mohave Co., Arizona, United States.

Churchite-(Y)

#BW58055
Locality
Nitzelbuch mine, Auerbach, Upper Palatinate, Bavaria, Germany 
Formula
YPO4·2H2
Availability
Sold
Size
5 x 5 x 3 cm - Miniature 
Tagged
carbonate , REE mineral  
Special Info
Type Locality 

Extremely rich specimen full of snow white acicular sprays. Although this is Churchite-(Y), there is often samarium substitution in the structure. So included with the specimen is a small vial of samarium oxide concentrate with the mineral. 


Churchite-(Y)

Formula
YPO4·2H2
Crystal System
Monoclinic 
Crystal Habit
Platy, Acicular, Aggregates 
Cleavage
Perfect, None, None 
Luster
Vitreous - Pearly 
Color
colorless, gray, snow white 
Streak
white 
Class
Monoclinic 
Fracture
Conchoidal 
Hardness
Collection
Bill Wilson Collection
Special Info
Type Locality

Churchite-(Y)

#RS58166
Locality
Kelly Bank mine, Rockbridge Co., Virginia, United States 
Formula
YPO4·2H2
Availability
Sold
Size
4 x 4 x 2.2 cm - Miniature 
Tagged
phosphate , REE mineral  

Snow white fibrous crystals in Rockbridgeite. Although this Churchite-(Y), there very well could be some dysprosium substitution in the structure. So included with the specimen is a small vial of dysprosium oxide concentrate with the mineral. 


Churchite-(Y)

Formula
YPO4·2H2
Crystal System
Monoclinic 
Crystal Habit
Platy, Acicular, Aggregates 
Cleavage
Perfect, None, None 
Luster
Vitreous - Pearly 
Color
colorless, gray, snow white 
Streak
white 
Class
Monoclinic 
Fracture
Conchoidal 
Hardness
Collection
RC Stamberg Collection

Davidite-(La)

#BW58025
Locality
Pandora prospect, Quijotoa dist., Pima County, Arizona, United States 
Formula
La(Y,U)Fe2(Ti,Fe,Cr,V)18(O,OH,F)38 
Availability
Sold
Size
5 x 3 x 3 cm - Miniature 
Tagged
REE mineral  
Special Info
Radioactive!! 

Black vitreous or "pitchy-lustered" grains of Davidite to 1.4cm. Very rich specimen. The Davidite is metamict and was formed in a transitional contact zone between a metaspessartine dike and a quartz monzonite (Mineralogy of Arizona, Anthony et al).

Davidite contains the rare earth elements lanthanum, cerium, and yittrium. Lanthanum, discovered in 1839, was first used in gas lantern mantles. Coleman still uses it in their mantles. Massive quantities of lanthanum is required for the production in hybrid automobiles. A typical battery used in a Toyota Prius requires 22-33 lbs of lanthanum.


Davidite-(La)

Formula
La(Y,U)Fe2(Ti,Fe,Cr,V)18(O,OH,F)38 
Crystal System
Trigonal 
Crystal Habit
Massive, Anhedral Grains, Metamict 
Cleavage
None, None, None 
Luster
Vitreous - Metallic 
Color
black, grayish black, brownish black, dark brown, reddish 
Streak
brownish black 
Class
Trigonal - Rhombohedral 
Fracture
Brittle - Conchoidal 
Hardness
Collection
Bill Wilson Collection
Special Info
Radioactive!!

Davidite-(La)

#BW58027
Locality
Kirumba Complex, Bwito, Rutshuru, North Kivu, DR Congo 
Formula
La(Y,U)Fe2(Ti,Fe,Cr,V)18(O,OH,F)38 
Availability
Sold
Size
5 x 4 x 2.5 cm - Miniature 
Tagged
REE mineral , vanadium  
Special Info
Radioactive!! 

A black vitreous mass of Davidite. Davidite may contain some cerium and yttrium, and uranium which destroys its crystal structure. Thus, the Davidite is metamict. Primary uses for lanthanum include specialty glasses and optics, electrodes and hydrogen storage.


Davidite-(La)

Formula
La(Y,U)Fe2(Ti,Fe,Cr,V)18(O,OH,F)38 
Crystal System
Trigonal 
Crystal Habit
Massive, Anhedral Grains, Metamict 
Cleavage
None, None, None 
Luster
Vitreous - Metallic 
Color
black, grayish black, brownish black, dark brown, reddish 
Streak
brownish black 
Class
Trigonal - Rhombohedral 
Fracture
Brittle - Conchoidal 
Hardness
Collection
Bill Wilson Collection
Special Info
Radioactive!!

Euxenite-(Y)

#BW58044
Locality
Crystal No. 8 mine, Chaffee County, Colorado, United States 
Formula
(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6 
Availability
Sold
Size
4 x 3 x 1.5 cm - Miniature 
Tagged
REE mineral , pegmatite mineral  
Special Info
Radioactive!! 

A pure mass of Euxenite with a slight crust. The fresh surface shows a good vitreous luster, almost sub-metallic and an obsidian appearance. It is heavy since it contains uranium, thorium, niobium, and tantalum. It may also contain cerium.

This locality is a NYF pegmatite which usually contain fluorite, niobium and yttrium. Yttrium was named for it's type locality Ytterby, Sweden. 


Euxenite-(Y)

Formula
(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6 
Crystal System
Orthorhombic 
Crystal Habit
Massive, Granular, Metamict 
Cleavage
None, None, None 
Luster
Greasy (Oily) 
Color
brownish black, brown, yellow, olive green 
Streak
reddish brown 
Class
Orthorhombic - Dipyramidal 
Fracture
Brittle 
Hardness
6.5 
Collection
Bill Wilson Collection
Special Info
Radioactive!!

Euxenite-(Y)

#BW58045
Locality
Kingman Feldspar mine, Mohave Co., Arizona, United States 
Formula
(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6 
Availability
Sold
Size
5 x 3 x 2 cm - Miniature 
Tagged
REE mineral  
Special Info
Radioactive!! 

Solid Euxenite with a good vitreous luster. The mine itself is anoth NYF pegmatite.


Euxenite-(Y)

Formula
(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6 
Crystal System
Orthorhombic 
Crystal Habit
Massive, Granular, Metamict 
Cleavage
None, None, None 
Luster
Greasy (Oily) 
Color
brownish black, brown, yellow, olive green 
Streak
reddish brown 
Class
Orthorhombic - Dipyramidal 
Fracture
Brittle 
Hardness
6.5 
Collection
Bill Wilson Collection
Special Info
Radioactive!!

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