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Mixed Minerals

Friday, 01 November 2019 07:00 PM

Introducing the "Mixed Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including ojuelaite, pansnerite, phurcalite, piemontite, pierrotite, and pyrrhotite and more from places like Mina Ojuela, Mapimi, Durango, Mexico, Tolbachik Volcano, Kamchatka, Russia, Merrivale quarry, Dartmoor, Devon, England, Picuris Range, Glenwoody dist., Taos Co., New Mexico, United States, Jas Roux, Pelvoux Mt., Hautes-Alpes, Provence-Alpes-Côte d'Azur, France, and Nikolaevskiy mine, Dal'negorsk, Russia.

Ojuelaite

#51579
Locality
Mina Ojuela, Mapimi, Durango, Mexico 
Formula
ZnFe3+2(AsO4)2(OH)2·4H2
Availability
Sold
Size
4 x 3 x 2.5 cm - Miniature 
Tagged
arsenate  
Special Info
Type Locality 

White mass of compact. silky, fibrous crystals of very rare Ojuelaite. The mass is 6mm across. Four or five occurences worldwide. This is the type locality.


Ojuelaite

Formula
ZnFe3+2(AsO4)2(OH)2·4H2
Crystal System
Monoclinic 
Cleavage
Good, None, None 
Luster
Vitreous (Glassy) 
Color
greenish yellow 
Streak
light yellow 
Class
Monoclinic - Prismatic 
Hardness
Special Info
Type Locality
Mineralpedia
View Ojuelaite
On Dakota Matrix
Previously Sold Ojuelaite
On Dakota Matrix
Other Available Ojuelaite
WebMineral
View Ojuelaite
Mindat
View Ojuelaite
SOLD
Pansnerite - 50511
Pansnerite - 50511

Pansnerite

#50511
Locality
Tolbachik Volcano, Kamchatka, Russia 
Formula
K3Na3(Fe3+,Al)6(AsO4)8 
Availability
Sold
Size
Micromount 
Special Info
XRD Confirmed 
Special Info
EDS Confirmed 
Special Info
Type & Only Locality 

This is a small grain, less than 1mm, of a crystal mounted for EDS work, and it is from the author's study material - so type material you might say. The author, Dr. Igor Pekov, kindly supplied this specimen. It is type and only locality.


Special Info
XRD Confirmed
Special Info
EDS Confirmed
Special Info
Type & Only Locality

Phurcalite

#PD51641
Locality
Merrivale quarry, Dartmoor, Devon, England 
Formula
Ca2(UO2)3O2(PO4)2·7H2
Availability
Available
Price
$65.00
Size
8 x 5 x 2 cm - Sm Cabinet 
Tagged
phosphate  
Special Info
Radioactive!! 

Very rich specimen with micro bright orange acicular crystals of Phurcalite.


Phurcalite

Formula
Ca2(UO2)3O2(PO4)2·7H2
Crystal System
Orthorhombic 
Cleavage
Perfect, Perfect, Good 
Luster
Vitreous - Adamantine 
Color
yellow 
Streak
yellow white 
Class
Orthorhombic - Dipyramidal 
Hardness
Collection
Don Phillips Collection
Special Info
Radioactive!!

Piemontite

#AH51643
Locality
Picuris Range, Glenwoody dist., Taos Co., New Mexico, United States 
Formula
Ca2Mn3+Al2(Si2O7)(SiO4)O(OH) 
Availability
Sold
Size
7 x 5 x 3 cm - Sm Cabinet 

Rich mass of bright red Piemontite, which is a member of the Epidote group, which contains at least 40% Mn(+3).


Piemontite

Formula
Ca2Mn3+Al2(Si2O7)(SiO4)O(OH) 
Crystal System
Monoclinic 
Crystal Habit
Blocky, Prismatic, Massive - Granular 
Cleavage
Good, Distinct, None 
Luster
Vitreous (Glassy) 
Color
yellow, carmine red, red, reddish brown, reddish black 
Streak
red 
Class
Monoclinic - Prismatic 
Fracture
Splintery 
Hardness
6-7 

Pierrotite

with Realgar, and poss. Chabournéite - #AH51602
Locality
Jas Roux, Pelvoux Mt., Hautes-Alpes, Provence-Alpes-Côte d'Azur, France 
Formula
TlSb3As2S8 
Availability
Sold
Size
2.5 x 1.5 x 1.5 cm - Thumbnail 
Tagged
sulfide  
Special Info
Type Locality 

For a little guy, this is a good rich specimen with several elongated plates of metallic black Pierrotite crystals to 2mm. Looking closely at the crystals, there is definitely cleavage in the elongation direction. There is also internal deep red reflections in the Pierrotite. Also, I believe there are crystal grains of black and metallic Chabournéite. These crystals do not have any elongation, but rather are equant. It is a excellent study specimen. It is associated with Realgar. 

Very good specimen! It is only found in three localities worldwide.


Pierrotite

Formula
TlSb3As2S8 
Crystal System
Orthorhombic 
Crystal Habit
Granular, Aggregates 
Luster
Metallic 
Color
grayish black 
Streak
reddish black 
Class
Orthorhombic - Pyramidal 
Hardness
3.5 
Collection
Arnold G Hampson Collection
Special Info
Type Locality

Pyrrhotite

with Quartz & Sphalerite - #AH51541
Locality
Nikolaevskiy mine, Dal'negorsk, Russia 
Formula
Fe7S8 
Availability
Sold
Size
6.5 x 6.5 x 2 cm - Sm Cabinet 
Tagged
sulfide  

A large barrel-shaped crystal of brassy Pyrrhotite to 2.7cm with needle Quartz and black Sphalerite. The Pyrrhotite ihas a little chipps off the sides.


Pyrrhotite

Formula
Fe7S8 
Crystal System
Monoclinic 
Crystal Habit
Tabular, Platy, Massive - Granular 
Cleavage
Imperfect, Imperfect, None 
Luster
Metallic 
Color
bronze, bronze red, dark brown 
Streak
gray black 
Class
Monoclinic - Prismatic 
Fracture
Uneven 
Hardness
3.5-4 
Collection
Arnold G Hampson Collection

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