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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.

SOLD

Churchite-(Y)

#BW58055

Details
Data
Provenance
Resources

Locality: Nitzelbuch mine, Auerbach, Upper Palatinate, Bavaria, Germany
Formula: YPO₄·2H₂O
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: YPO₄·2H₂O
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: 3

Collection: Bill Wilson Collection
Special Info: Type Locality

Mineralpedia: View Churchite-(Y)
On Dakota Matrix: Previously Sold Churchite-(Y)
On Dakota Matrix: Other Available Churchite-(Y)
WebMineral: View Churchite-(Y)
Mindat: View Churchite-(Y)

SOLD

Churchite-(Y)

#RS58166

Details
Data
Provenance
Resources

Locality: Kelly Bank mine, Rockbridge Co., Virginia, United States
Formula: YPO₄·2H₂O
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: YPO₄·2H₂O
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: 3

Collection: RC Stamberg Collection

Mineralpedia: View Churchite-(Y)
On Dakota Matrix: Previously Sold Churchite-(Y)
On Dakota Matrix: Other Available Churchite-(Y)
WebMineral: View Churchite-(Y)
Mindat: View Churchite-(Y)

SOLD

Davidite-(La)

#BW58025

Details
Data
Provenance
Resources

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: 6

Collection: Bill Wilson Collection
Special Info: Radioactive!!

On Dakota Matrix: Previously Sold Davidite-(La)
On Dakota Matrix: Other Available Davidite-(La)
WebMineral: View Davidite-(La)
Mindat: View Davidite-(La)

SOLD

Davidite-(La)

#BW58027

Details
Data
Provenance
Resources

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: 6

Collection: Bill Wilson Collection
Special Info: Radioactive!!

On Dakota Matrix: Previously Sold Davidite-(La)
On Dakota Matrix: Other Available Davidite-(La)
WebMineral: View Davidite-(La)
Mindat: View Davidite-(La)

SOLD

Euxenite-(Y)

#BW58044

Details
Data
Provenance
Resources

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.