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Rare & Systematic Minerals

Friday, 07 February 2020 09:00 PM

Introducing the "Rare & Systematic Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including ferberite, fluorcalciobritholite, fluorite, francevillite, and gadolinite-(ce) and more from places like Silver Bell mine, Tunnel No. 6, Ophir dist., San Miguel Co., Colorado, United States, Yaogangxian mine, Chenzhou, Hunan prov., China, Kukisvumchorr Mt., Khibiny Massif, Kola Peninsula, Russia, William Wise mine, Westmoreland, Cheshire Co., New Hampshire, United States, Franceville, Haut-Ogooué, Gabon, and Western Keivy Massif, Keivy Mountains, Lovozersky dist., Murmansk Oblast, Russia.

Ferberite

#AH51833
Locality
Silver Bell mine, Tunnel No. 6, Ophir dist., San Miguel Co., Colorado, United States 
Formula
Fe2+WO4 
Availability
Sold
Size
8 x 8 x 3 cm - Sm Cabinet 
Tagged
tungsten  

A good reference specimen from this important Colorado district in the San Juan Mountains. This specimen contains striated black blades of Ferberite from 1 to 4mm in brecciated matrix. Collected in 1962 by Arnold Hampson.


Ferberite

Formula
Fe2+WO4 
Crystal System
Monoclinic 
Crystal Habit
Prismatic, Lamellar, Massive - Granular 
Cleavage
Perfect, Parting, Parting 
Luster
Sub Metallic 
Color
black 
Streak
brownish black 
Class
Monoclinic - Prismatic 
Fracture
Brittle - Uneven 
Hardness
4.5 
Collection
Arnold G Hampson Collection
Mineralpedia
View Ferberite
On Dakota Matrix
Previously Sold Ferberite
On Dakota Matrix
Other Available Ferberite
WebMineral
View Ferberite
Mindat
View Ferberite

Ferberite

with Quartz - #AH52232
Locality
Yaogangxian mine, Chenzhou, Hunan prov., China 
Formula
Fe2+WO4 
Availability
Sold
Size
11 x 7 x 4 cm - Cabinet 
Tagged
tungsten  

Large cabinet specimen with a large deeply striated blade of Ferberite to 7cm and others at the base with Quartz. Neat piece.


Ferberite

Formula
Fe2+WO4 
Crystal System
Monoclinic 
Crystal Habit
Prismatic, Lamellar, Massive - Granular 
Cleavage
Perfect, Parting, Parting 
Luster
Sub Metallic 
Color
black 
Streak
brownish black 
Class
Monoclinic - Prismatic 
Fracture
Brittle - Uneven 
Hardness
4.5 
Collection
Robert J. Waidler Collection
Mineralpedia
View Ferberite
On Dakota Matrix
Previously Sold Ferberite
On Dakota Matrix
Other Available Ferberite
WebMineral
View Ferberite
Mindat
View Ferberite
SOLD
Fluorcalciobritholite - BN52288
Fluorcalciobritholite - BN52288

Fluorcalciobritholite

#BN52288
Locality
Kukisvumchorr Mt., Khibiny Massif, Kola Peninsula, Russia 
Formula
(Ca,REE)5(SiO4,PO4)3
Availability
Sold
Size
2.5 x 2.5 x 1 cm - Thumbnail 
Tagged
phosphate , REE mineral  

A single brown acicular crystal to about 0.5mm. Fluorcalciobritholite is a five-locality rare-earth phosphate.


Fluorcalciobritholite

Formula
(Ca,REE)5(SiO4,PO4)3
Crystal System
Hexagonal 
Crystal Habit
Hexagonal, Prismatic 
Luster
Vitreous (Glassy) 
Color
pale pinkish brown, brown 
Streak
white 
Class
Hexagonal - Dipyramidal 
Fracture
Brittle 
Hardness
5.5 
Collection
Dr. Buford Nichols Collection

Fluorite

#AH52144
Locality
William Wise mine, Westmoreland, Cheshire Co., New Hampshire, United States 
Formula
CaF2 
Availability
Sold
Size
7 x 3.5 x 4 cm - Sm Cabinet 

Cluster of several octahedrl crystals to 1.5cm with good rich green color. Shows much better in person - the green color gets washed out by the digital camera.


Fluorite

Formula
CaF2 
Crystal System
Isometric 
Crystal Habit
Crystalline - Coarse, Massive - Granular, Disseminated 
Cleavage
Three perfect, octahedral cleavages. 
Luster
Vitreous (Glassy) 
Color
purple, clear, yellow, green, red, blue 
Streak
white 
Geological Setting
Occurs in a wide range of geologic environments including low temperature Missississippi Valley lead-zinc deposits, hydrothermal gold deposits, Alpine cleft metamorphic environments  
Class
Isometric - Hexoctahedral 
Fracture
Uneven 
Hardness
Collection
Arnold G Hampson Collection
Mineralpedia
View Fluorite
On Dakota Matrix
Previously Sold Fluorite
On Dakota Matrix
Other Available Fluorite
WebMineral
View Fluorite
Mindat
View Fluorite

Francevillite

#52298
Locality
Franceville, Haut-Ogooué, Gabon 
Formula
Ba(UO2)2(VO4)2·5H2
Availability
Sold
Size
2 x 2.5 x 1.5 cm - Thumbnail 
Tagged
vanadium  
Special Info
Radioactive!! 
Special Info
Type Locality 

Opaque orange tabular crystals. Exceptional specimen.


Francevillite

Formula
Ba(UO2)2(VO4)2·5H2
Crystal System
Orthorhombic 
Cleavage
Perfect, None, None 
Luster
Adamantine - Pearly 
Color
brownish yellow, yellow, yellow green 
Streak
light yellow 
Class
Orthorhombic - Dipyramidal 
Hardness
Collection
Don Cooke Collection
Special Info
Radioactive!!
Special Info
Type Locality

Gadolinite-(Ce)

#DP52207
Locality
Western Keivy Massif, Keivy Mountains, Lovozersky dist., Murmansk Oblast, Russia 
Formula
Be2Fe2+Ce2Si2O10 
Availability
Sold
Size
2.5 x 2.5 x 2.5 cm - Thumbnail 
Tagged
beryllium , REE mineral  

Black vitreous mass of Gadolinite, a rare earth mineral.


Gadolinite-(Ce)

Formula
Be2Fe2+Ce2Si2O10 
Crystal System
Monoclinic 
Crystal Habit
Metamict 
Cleavage
None, None, None 
Luster
Vitreous (Glassy) 
Color
black 
Streak
greenish gray 
Class
Monoclinic - Prismatic 
Fracture
Brittle - Conchoidal 
Hardness
6.5-7 
Collection
Don Phillips Collection

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