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Mixed Minerals

Friday, 13 March 2020 06:00 PM

Introducing the "Mixed Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including pyromorphite, renardite, rutherfordine, soddyite, stibnite, and tetrahedrite and more from places like Barstows Trench, Roughton Gill, Caldbeck Fells, Cumbria, England, Shinkolobwe, Katanga, Democratic Republic of Congo, Musonoi mine, Kolwezi, Shaba Cu belt, Democratic Republic of Congo, Swambo Hill, Katanga, Democratic Republic of Congo, Xikuangshan Sb deposit, Lengshuijiang Co., Loudi, Hunan, China, and Herodsfoot mine, Liskeard, Cornwall, England.

Pyromorphite

#52430
Locality
Barstows Trench, Roughton Gill, Caldbeck Fells, Cumbria, England 
Formula
Pb5(PO4)3Cl 
Availability
Available
Price
$85.00
Size
6.5 x 6 x 4 cm - Sm Cabinet 
Tagged
phosphate  

Green yellow crystals of prismatic and hexagonal Pyromorphite to 3mm. Fairly good specimen from this classic English locality.


Pyromorphite

Formula
Pb5(PO4)3Cl 
Crystal System
Hexagonal 
Crystal Habit
Crystals short to long prismatic, acicular, often hoppered terminations, rarely tabular to equant; radiating to branching groups, tapering to a point. Commonly rounded, globular, reniform, botryoidal. 
Cleavage
On {1011}, interrupted 
Luster
Resinous to subadamantine 
Color
Dark grass-green, green, yellow, yellow-orange, reddish orange, yellow-brown, brown, tan, grayish, may be colorless 
Streak
White 
Geological Setting
A secondary mineral in the oxidized zone of lead deposits 
Class
Hexagonal, 6/m - Dipyramidal 
Fracture
Uneven to subconchoidal 
Hardness
3.5–4 

Renardite

with Torbernite - #52763
Locality
Shinkolobwe, Katanga, Democratic Republic of Congo 
Formula
Pb(UO2)4(PO4)2(OH)4•H2
Availability
Sold
Size
1 x 1 x 1 cm - Thumbnail 
Tagged
phosphate  
Special Info
Radioactive!! 

Yellow, thin, bladed crystals less than 1mm with green Torbernite.


Renardite

Formula
Pb(UO2)4(PO4)2(OH)4�7(H2O) 
Crystal System
Orthorhombic 
Crystal Habit
Druse 
Cleavage
Perfect, None, None 
Color
yellow 
Class
Orthorhombic - Dipyramidal 
Hardness
Special Info
Radioactive!!

Rutherfordine

#52764
Locality
Musonoi mine, Kolwezi, Shaba Cu belt, Democratic Republic of Congo 
Formula
(UO2)CO3 
Availability
Sold
Size
3.5 x 3 x 2.5 cm - Miniature 
Tagged
carbonate  
Special Info
Radioactive!! 

Milky yellow pointed and prismatic crystals to 1mm in large groups 9mm long. Very good specimen with excellent crystals.


Rutherfordine

Formula
(UO2)CO3 
Crystal System
Orthorhombic 
Crystal Habit
Encrustations 
Cleavage
Perfect, Distinct, None 
Luster
Earthy (Dull) 
Color
brownish, brownish yellow, white, light brown orange, light yellow 
Streak
yellow 
Class
Orthorhombic - Dipyramidal 
Hardness
Special Info
Radioactive!!

Soddyite

#52767
Locality
Swambo Hill, Katanga, Democratic Republic of Congo 
Formula
(UO2)2SiO4·2H2
Availability
Sold
Size
5 x 3.5 x 3 cm - Miniature 
Special Info
Radioactive!! 

Opaque yellow, well-formed crystals less than 1mm with very good coverage.


Soddyite

Formula
(UO2)2SiO4·2H2
Crystal System
Orthorhombic 
Crystal Habit
Prismatic, Striated, Pyramidal 
Cleavage
Perfect, Good, None 
Luster
Vitreous (Glassy) 
Color
yellow, canary yellow, yellowish green, yellow 
Streak
yellow 
Class
Orthorhombic - Dipyramidal 
Hardness
3-4 
Special Info
Radioactive!!
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Stibnite

#AH52739
Locality
Xikuangshan Sb deposit, Lengshuijiang Co., Loudi, Hunan, China 
Formula
Sb2S3 
Availability
Sold
Size
13.5 x 4 x 2 cm - Cabinet 
Tagged
sulfide  

Long striated crystals to 13cm in a very nice group. Several of the crystals are nicely terminated, but some of the large crystals are detachement points.


Stibnite

Formula
Sb2S3 
Crystal System
Orthorhombic 
Crystal Habit
Prismatic, Striated, Granular 
Cleavage
Perfect, None, None 
Luster
Metallic 
Color
lead gray, bluish lead gray, steel gray, black 
Streak
blackish gray 
Class
Orthorhombic - Dipyramidal 
Fracture
Conchoidal 
Hardness
Collection
Arnold G Hampson Collection
Mineralpedia
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On Dakota Matrix
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Tetrahedrite

#52458
Locality
Herodsfoot mine, Liskeard, Cornwall, England 
Formula
Cu12Sb4S13 
Availability
Available
Price
$35.00
Size
4 x 3.5 x 3 cm - Miniature 
Tagged
sulfide , copper  

4mm Tetrahedrite crystals probably coated with Chalcopyrite. 


Tetrahedrite

Formula
Cu12Sb4S13 
Crystal System
Isometric 
Crystal Habit
Massive - Granular, Massive 
Cleavage
None, None, None 
Luster
Metallic 
Color
iron gray, black, steel gray 
Streak
black 
Class
Isometric - Hextetrahedral 
Fracture
Uneven 
Hardness
3.5-4 

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