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Mixed Minerals

Saturday, 13 January 2018 12:00 PM

Introducing the "Mixed Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including andradite, chloroxiphite, gold, pharmacosiderite, strengite, and wilkinsonite and more from places like Harstigen mine, Filipstad, Värmland, Sweden, Higher Pitts Mine, Priddy, Somerset, England, Harvard mine, Jamestown, Tuolumne Co., California, United States, Wheal Gorland, St. Day dist., Cornwall, England, Three Oaks Gap, Polk Co., Arkansas, United States, and Warrumbungle Volcano, Gowen Co., New South Wales, Australia.

Andradite

with unknown - #PD48052
Locality
Harstigen mine, Filipstad, Värmland, Sweden 
Formula
Ca3Fe3+2(SiO4)3 
Availability
Available
Price
$65.00
Size
10 x 6 x 6.5 cm - Cabinet 
Special Info
EDS Confirmed 

This is a large specimen with one face partially covered by crude to formless dark orange Andradite (EDS). Amongst the Andradite are tiny red spheres of an unknown mineral. These crystals are likely covered by Quartz, imparting a crystal ball-like appearance. I have not bothered to test these, and have chosen to leave these to your imagination.


Andradite

Formula
Ca3Fe3+2(SiO4)3 
Crystal System
Isometric 
Crystal Habit
Crystalline - Coarse, Euhedral Crystals, Massive 
Cleavage
None, None, None 
Luster
Vitreous (Glassy) 
Color
black, yellowish brown, red, greenish yellow, gray 
Streak
white 
Class
Isometric - Hexoctahedral 
Fracture
Conchoidal 
Hardness
6.5-7 
Collection
Don Phillips Collection
Special Info
EDS Confirmed
Mineralpedia
View Andradite
On Dakota Matrix
Previously Sold Andradite
On Dakota Matrix
Other Available Andradite
WebMineral
View Andradite
Mindat
View Andradite

Chloroxiphite

in Mendipite - #PD33012
Locality
Higher Pitts Mine, Priddy, Somerset, England 
Formula
Pb3CuO2Cl2(OH)2 
Availability
Available
Price
$65.00
Size
3.5 x 2.5 x 2.5 cm - Miniature 
Tagged
copper  
Special Info
Type Locality 

Dull, dark green 2mm crystal of Chloroxiphite in light pinkish, striated Mendipite.


Chloroxiphite

Formula
Pb3CuO2Cl2(OH)2 
Crystal System
Monoclinic 
Crystal Habit
Tabular 
Cleavage
Perfect, Distinct, None 
Luster
Adamantine - Resinous 
Color
dull olive green, pistachio green 
Streak
light yellow green 
Class
Monoclinic - Prismatic 
Fracture
Brittle 
Hardness
2.5 
Collection
Don Phillips Collection
Special Info
Type Locality

Gold

on Quartz - #48228
Locality
Harvard mine, Jamestown, Tuolumne Co., California, United States 
Formula
Au 
Availability
Available
Price
$195.00
Size
1.5 x 1.7 x 0.3 cm - Thumbnail 
Tagged
native element  

A bright shiny Gold specimen free of matrix. Excellent small piece for show.


Gold

Formula
Au 
Crystal System
Isometric 
Crystal Habit
Arborescent, Platy, Granular 
Cleavage
None, None, None 
Luster
Metallic 
Color
yellow, pale yellow, orange, yellow white, reddish white 
Streak
yellow 
Class
Isometric - Hexoctahedral 
Fracture
Hackly 
Hardness
2.5-3 
Mineralpedia
View Goldmanite
On Dakota Matrix
Previously Sold Gold
On Dakota Matrix
Other Available Gold
WebMineral
View Gold
Mindat
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Pharmacosiderite

with Scorodite - #BN48217
Locality
Wheal Gorland, St. Day dist., Cornwall, England 
Formula
KFe3+4(AsO4)3(OH)4·6-7H2
Availability
Available
Price
$75.00
Size
6 x 4.5 x 2.5 cm - Sm Cabinet 
Tagged
arsenate  

Grass green to bright green Pharmacosiderite crystals to about 0.75mm with grey to bluish Scorodite. The Scorodite is not as blue as the digital photos depict it as. A hand-written label says it was collected about 1977-1979.


Pharmacosiderite

Formula
KFe3+4(AsO4)3(OH)4·6-7H2
Crystal System
Isometric 
Crystal Habit
Blocky, Crystalline - Coarse, Earthy 
Cleavage
Indistinct, None, None 
Luster
Adamantine - Resinous 
Color
olive green, emerald green, reddish brown, yellowish brown, honey yellow 
Streak
yellowish green 
Class
Isometric - Hextetrahedral 
Fracture
Brittle - Sectile 
Hardness
2.5 
Collection
Dr. Buford Nichols Collection

Strengite

on Kidwellite with Cacoxenite & Beraunite - #BN48220
Locality
Three Oaks Gap, Polk Co., Arkansas, United States 
Formula
Fe3+PO4·2H2
Availability
Available
Price
$195.00
Size
5.5 x 4.5 x 3 cm - Sm Cabinet 
Tagged
phosphate  

Light purple crystal clusters of Strengite to 2mm on light to dark green Kidwellite. Look closely along the edges and golden yellow fibrous crystals of fytikish habit Cacoxenite can be seen. Outward closer to the matrix are dark bands of gorgeous, concentric Beraunite. It is a fine specimen, not to be found in today's world. Don't bother looking up fytikish, I made it up.


Strengite

Formula
Fe3+PO4·2H2
Crystal System
Orthorhombic 
Crystal Habit
Spherical, Radial, Botryoidal 
Cleavage
Good, Poor, None 
Luster
Vitreous (Glassy) 
Color
colorless, pale violet, deep violet, red, carmine red 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Fracture
Brittle - Conchoidal 
Hardness
3.5 
Collection
Dr. Buford Nichols Collection
Mineralpedia
View Strengite
On Dakota Matrix
Previously Sold Strengite
On Dakota Matrix
Other Available Strengite
WebMineral
View Strengite
Mindat
View Strengite

Wilkinsonite

#PD48256
Locality
Warrumbungle Volcano, Gowen Co., New South Wales, Australia 
Formula
Na4(Fe2+8Fe3+4)O4[Si12O36
Availability
Available
Price
$75.00
Size
2 x 1.5 x 0.3 cm - Thumbnail 
Special Info
Type Locality 

Black grains as inclusions, less than 50microns, in Anorthoclase. You cannot see the grains. For a good visual see the RRUFF database. Wilkinsonite is a three locality mineral and this is type locality, a volcanic deposit in peralkaline trachyte. One of the other localities is a meteorite. The third is also a volcanic deposite as syenite ejecta. Wilkinsonite forms a series with aenigmatite. This is a small specimen.


Wilkinsonite

Formula
Na4(Fe2+8Fe3+4)O4[Si12O36
Crystal System
Triclinic 
Luster
Vitreous (Glassy) 
Color
black 
Streak
brown 
Class
Triclinic - Pinacoidal 
Hardness
Collection
Don Phillips Collection
Special Info
Type Locality

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