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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 argentopyrite, arthurite, cassiterite, cupromolybdite, and pyromorphite and more from places like Jachymov, Erzgegirge, Bohemia, Czech Republic, Hingston Down quarry, Gunnislake, Cornwall, England, Pendarves mine, Camborne, Cornwall, England, Poldory Sett, United Downs, St. Day, Cornwall, England, Tolbachik Volcano, Kamchatka, Russia, and Barstows Trench, Roughton Gill, Caldbeck Fells, Cumbria, England.

Argentopyrite

#52367
Locality
Jachymov, Erzgegirge, Bohemia, Czech Republic 
Formula
AgFe2S3 
Availability
Available
Price
$30.00
Size
3 x 2 x 1 cm - Thumbnail 
Tagged
sulfide , silver  

Very tiny formless grains of Argentopyrite.


Argentopyrite

Formula
AgFe2S3 
Crystal System
Orthorhombic 
Cleavage
None, None, None 
Luster
Metallic 
Color
blue, bronze brown, green, yellow, white 
Class
Orthorhombic - Dipyramidal 
Fracture
Brittle - Uneven 
Hardness
3.5-4 

Arthurite

#52471
Locality
Hingston Down quarry, Gunnislake, Cornwall, England 
Formula
CuFe3+2(AsO4)2(OH)2·4H2
Availability
Available
Price
$60.00
Size
7 x 6.5 x 1.5 cm - Sm Cabinet 
Tagged
arsenate , copper  
Special Info
Type Locality 

Green coatings and micro crystals less than 0.75mm. Some areas contain good well-defined crystals whereas other areas are crystals which have all merged together forming a crust. This is the type locality.


Arthurite

Formula
CuFe3+2(AsO4)2(OH)2·4H2
Crystal System
Monoclinic 
Crystal Habit
Prismatic, Acicular, Spherical 
Cleavage
None, None, None 
Luster
Vitreous (Glassy) 
Color
apple green, emerald green 
Streak
light green 
Class
Monoclinic - Prismatic 
Fracture
Brittle 
Hardness
3-4 
Special Info
Type Locality
Mineralpedia
View Arthurite
On Dakota Matrix
Previously Sold Arthurite
On Dakota Matrix
Other Available Arthurite
WebMineral
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Mindat
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Cassiterite

#52435
Locality
Pendarves mine, Camborne, Cornwall, England 
Formula
SnO2 
Availability
Available
Price
$125.00
Size
5.5 x 3.5 x 3 cm - Sm Cabinet 
Tagged
tin  

Rich specimen with abundant glassy brown crystals of well-formed Cassiterite crystals up to 4mm. Ex. Richard Barstow with tag.


Cassiterite

Formula
SnO2 
Crystal System
Tetragonal 
Crystal Habit
Prismatic, Massive, Botryoidal 
Cleavage
Perfect, Indistinct, None 
Luster
Adamantine 
Color
brown, brownish black, colorless, green, gray 
Streak
brownish white 
Class
Tetragonal - Ditetragonal Dipyramidal 
Fracture
Irregular 
Hardness
6-7 

Cassiterite

#52440
Locality
Poldory Sett, United Downs, St. Day, Cornwall, England 
Formula
SnO2 
Availability
Available
Price
$150.00
Size
7 x 5.5 x 5.5 cm - Sm Cabinet 
Tagged
tin  

Exceptionally well formed glassy brown crystals of Cassiterite to 2mm. 


Cassiterite

Formula
SnO2 
Crystal System
Tetragonal 
Crystal Habit
Prismatic, Massive, Botryoidal 
Cleavage
Perfect, Indistinct, None 
Luster
Adamantine 
Color
brown, brownish black, colorless, green, gray 
Streak
brownish white 
Class
Tetragonal - Ditetragonal Dipyramidal 
Fracture
Irregular 
Hardness
6-7 

Cupromolybdite

#52393
Locality
Tolbachik Volcano, Kamchatka, Russia 
Formula
Cu3O(MoO4)2 
Availability
Available
Price
$95.00
Size
1 x 1 x 1 cm - Thumbnail 
Tagged
copper  
Special Info
XRD Confirmed 
Special Info
EDS Confirmed 
Special Info
Type & Only Locality 
Special Info
Author's Material 

Red elongated octahedral micro crystals less than 0.5mm. This is a specimen studied by the author Dr. Igor Pekov. 


Special Info
XRD Confirmed
Special Info
EDS Confirmed
Special Info
Type & Only Locality
Special Info
Author's Material

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 

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