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Rare Minerals

Sunday, 09 January 2022 06:00 PM

Introducing the "Rare Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including canavesite, cancrinite, cleusonite, columbite-(fe), cronstedtite, and hauyne and more from places like Brosso mine, Calea, Torino, Piedmont, Italy, Dennis Hill, Litchfield, Kennebec Co., Maine, United States, Kaiserer quarry, Rauris valley, Salzburg, Austria, Bennett quarry, Buckfield, Oxford Co., Maine, United States, Fowey Consols mine, St. Austell dist., Cornwall, England, and Monte Somma, Vesuvius, Campania, Italy.

Canavesite

with Magnetite - #BW57296
Locality
Brosso mine, Calea, Torino, Piedmont, Italy 
Formula
Mg2(HBO3)(CO3)·5H2
Availability
Sold
Size
4.5 x 3.5 x 1.2 cm - Miniature 
Tagged
carbonate  
Special Info
Type Locality 

Fantastic specimen with snow white sprays of acicular Canavesite. It is associated with black, formless Magnetite and minor Ludwigite. The Brosso mine is the type locality for Canavesite and it is the first of two localities known.


Canavesite

Formula
Mg2(HBO3)(CO3)·5H2
Crystal System
Monoclinic 
Crystal Habit
Acicular, Rosette 
Cleavage
Distinct, Distinct, None 
Luster
Vitreous (Glassy) 
Color
white 
Streak
white 
Class
Monoclinic - Prismatic 
Hardness
Collection
Bill Wilson Collection
Special Info
Type Locality

Cancrinite

with Nepheline - #BW57400
Locality
Dennis Hill, Litchfield, Kennebec Co., Maine, United States 
Formula
(Na,Ca,□)8(Al6Si6)O24(CO3,SO4)2·2H2
Availability
Sold
Size
6.5 x 6 x 3 cm - Sm Cabinet 

Gorgeous yellow crystalline mass. A great example of this mineral. Cancrinite occurs in a variety of colors including red, white, and blue. The mineral is a feldspathoid which forms in igneous rock which has more aluminosilicates of sodium, potassium, or calcium and not emough silica to form feldspars.


Cancrinite

Formula
(Na,Ca,[box])8(Al6Si6)O24(CO3,SO4)2·2H2
Crystal System
Hexagonal 
Crystal Habit
Massive, Prismatic 
Cleavage
Perfect, None, None 
Luster
Vitreous (Glassy) 
Color
blue, colorless, gray green, yellow, white 
Streak
white 
Class
Hexagonal - Pyramidal 
Fracture
Conchoidal 
Hardness
Collection
Bill Wilson Collection

Cleusonite

#BW57374
Locality
Kaiserer quarry, Rauris valley, Salzburg, Austria 
Formula
Pb(U4+,U6+)Fe2+2(Ti,Fe2+,Fe3+)18(O,OH)38 
Availability
Sold
Size
2 x 1.5 x 1 cm - Thumbnail 

There are three little, less than 1mm, grains of Cleusonite in Quartz matrix. I would imagine that they are metamict, given the composition and the way they look (no form, glassy black).


Cleusonite

Formula
Pb(U4+,U6+)Fe2+2(Ti,Fe2+,Fe3+)18(O,OH)38 
Crystal System
Trigonal 
Cleavage
None, None, None 
Luster
Sub Metallic 
Color
black 
Streak
black 
Class
Trigonal - Rhombohedral 
Fracture
Brittle - Conchoidal 
Hardness
6-7 
Collection
Bill Wilson Collection
SOLD
Columbite-(Fe) - BW57388
Columbite-(Fe) - BW57388

Columbite-(Fe)

#BW57388
Locality
Bennett quarry, Buckfield, Oxford Co., Maine, United States 
Formula
Fe2+Nb2O6 
Availability
Sold
Size
4 x 3.5 x 0.6 cm - Miniature 
Tagged
pegmatite mineral  

A locality specimen - a plate of striated Columbite.


Columbite-(Fe)

Formula
Fe2+Nb2O6 
Crystal System
Orthorhombic 
Crystal Habit
Massive - Granular, Striated 
Cleavage
Distinct, None, None 
Luster
Sub Metallic 
Color
black, brownish black 
Streak
blackish brown 
Class
Orthorhombic - Dipyramidal 
Fracture
Sub Conchoidal 
Hardness
Collection
Bill Wilson Collection

Cronstedtite

#BW57392
Locality
Fowey Consols mine, St. Austell dist., Cornwall, England 
Formula
(Fe2+,Fe3+)3(Si,Fe3+)2O5(OH)4 
Availability
Sold
Size
6.5 x 3 x 4 cm - Sm Cabinet 

This mineral is actually a member of the Serpentine group, you'd never know it. It forms beautiful jet black long tapering cone-shaped crystals. There may be a discrepency with the locality. It is just what is given on the Bill Wilson label. A seasoned collector of English minerals would know......


Cronstedtite

Formula
(Fe2+,Fe3+)3(Si,Fe3+)2O5(OH)4 
Crystal System
Trigonal 
Crystal Habit
Pyramidal, Divergent, Amorphous 
Cleavage
Perfect, None, None 
Luster
Vitreous - Resinous 
Color
brownish black, greenish black, dark brown, black 
Streak
dark olive green 
Class
Trigonal - Ditrigonal Pyramidal 
Hardness
3.5 
Collection
Bill Wilson Collection

Hauyne

#BW57377
Locality
Monte Somma, Vesuvius, Campania, Italy 
Formula
Na3Ca(Si3Al3)O12(SO4
Availability
Sold
Size
5 x 4. x 4 cm - Miniature 
Special Info
Type Locality 

Pretty glassy blue crystal grains to 7mm. Hauyne, like the Cancrinite in this update, is a feldspathoid.


Hauyne

Formula
Na3Ca(Si3Al3)O12(SO4
Crystal System
Isometric 
Crystal Habit
Crystalline - Coarse, Twinning Common, Euhedral Crystals 
Cleavage
Perfect, Perfect, Perfect 
Luster
Vitreous - Greasy 
Color
blue, green, red, yellow, gray 
Streak
bluish white 
Class
Isometric - Hextetrahedral 
Fracture
Conchoidal 
Hardness
5-6 
Collection
Bill Wilson Collection
Special Info
Type Locality
Mineralpedia
View Hauyne
On Dakota Matrix
Previously Sold Hauyne
On Dakota Matrix
Other Available Hauyne
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Mindat
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