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Rare Minerals

Friday, 22 September 2017 06:00 PM

Introducing the "Rare Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including metavauxite, sternbergite, stilbite, and valleriite and more from places like Llallagua, Bolivia, Jachymov, Erzgegirge, Bohemia, Czech Republic, Granite Mountain, Little Rock, Pulaski Co., Arkansas, United States, and Little Chief mine, Whitehorse dist., Yukon, Canada.

Metavauxite

with Paravauxite - #BN47491
Locality
Llallagua, Bolivia 
Formula
Fe2+Al2(PO4)2(OH)2·8H2
Availability
Sold
Size
4 x 3.5 x 3 cm - Miniature 
Tagged
phosphate  
Special Info
Antique Specimen 

This is a cool old specimen circa 1925 from the R. B. Gage collection. The mineral Gageite was named in his honor. He specialized in Franklin, NJ and was a well-known collector in the early 1900's.  See prov. tab for the label. It was originally labeled as Paravauxite but since named as Metavauxite based upon the crystal habit although Paravauxite is likely too. The crystals are nice long, thin bladed and ice green. There are also several blue micro crystals of Vauxite. 


Metavauxite

Formula
Fe2+Al2(PO4)2(OH)2·8H2
Crystal System
Monoclinic 
Cleavage
None, None, None 
Luster
Vitreous (Glassy) 
Color
colorless, white, light green 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Brittle 
Hardness
Collection
Dr. Buford L. Nichols Collection
Special Info
Antique Specimen

Sternbergite

#RW47521
Locality
Jachymov, Erzgegirge, Bohemia, Czech Republic 
Formula
AgFe2S3 
Availability
Available
Price
$650.00
Size
1.8 x 1.0 x 1.0 cm - Thumbnail 
Tagged
sulfide , silver  

Purchased by Waidler from Rob Lavinsky several years ago, this specimen is small but boast incredible pseudohexagonal thin rosette-like groups of crystals. At the right angles and with enough light you will see dark red-purple reflections, which apparently is a tarnish. I thought these were deep red internal reflections seen in silver sulfosalts. These are actually tarnished outer reflections typical of Sternbergite. Otherwise, is has a brilliant reflective metallic luster with black to dark grey color with mild iridescences of other colors. The largest crystal is 3-5mm across depending how you measure it. There are numerous other crystals.

Type locality.


Sternbergite

Formula
AgFe2S3 
Crystal System
Orthorhombic 
Crystal Habit
Radial, Twinning Common 
Cleavage
Perfect, None, None 
Luster
Metallic 
Color
blue violet, golden brown 
Streak
black 
Class
Orthorhombic - Dipyramidal 
Fracture
Flexible 
Hardness
1-1.5 
Collection
Robert J. Waidler Collection

Stilbite

with Albite - #BN47514
Locality
Granite Mountain, Little Rock, Pulaski Co., Arkansas, United States 
Availability
Available
Price
$50.00
Size
5.5 x 6 x 4 cm - Sm Cabinet 

Orange rounded crystal groups to 3mm with Albite in syenite matrix. Rich.


Stilbite

Collection
Dr. Buford L. Nichols Collection
Mineralpedia
View Stilbite-Ca
On Dakota Matrix
Previously Sold Stilbite
On Dakota Matrix
Other Available Stilbite
WebMineral
View Stilbite
Mindat
View Stilbite

Valleriite

with Bornite & Magnetite - #RW47512
Locality
Little Chief mine, Whitehorse dist., Yukon, Canada 
Formula
2[(Fe,Cu)S]·1.53[(Mg,Al)(OH)2
Availability
Available
Price
$65.00
Size
4.5 x 4 x 4 cm - Miniature 
Tagged
copper  

Brassy gold thin partings of Valeriite on slickensides of serpentized Magnetite and Bornite host rock.


Valleriite

Formula
2[(Fe,Cu)S]·1.53[(Mg,Al)(OH)2
Crystal System
Trigonal 
Crystal Habit
Massive, Nodular 
Cleavage
Perfect, None, None 
Luster
Metallic 
Color
bronze, gray 
Class
Trigonal - Hexagonal Scalenohedral 
Hardness
1-1.5 
Collection
Robert J. Waidler Collection

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