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Mixed Rare Minerals

Saturday, 07 May 2022 12:00 PM

Introducing the "Mixed Rare Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including coronadite, cuproromeite, pseudomalachite, and spinel and more from places like South mine, Broken Hill, New South Wales, Australia, Comanche mine, Mono Co., California, United States, Erl, Kasbach-Ohlenberg, Linz am Rhein, Rhineland-Palatinate, Germany, and Monte Somma, Vesuvius, Campania, Italy.

Coronadite

#58435
Locality
South mine, Broken Hill, New South Wales, Australia 
Formula
PbMn4+2Mn2+6O16 
Availability
Available
Price
$75.00
Size
8 x 4.5 x 4 cm - Sm Cabinet 

A cool black botryoidal crystal aggregates to 8mm. 


Coronadite

Formula
PbMn4+2Mn2+6O16 
Crystal System
Monoclinic 
Crystal Habit
Fibrous, Botryoidal 
Luster
Sub Metallic 
Color
grayish black, dark gray, black 
Streak
brownish black 
Class
Monoclinic - Prismatic 
Hardness
4.5-5 

Cuproromeite

aka Partzite - #58429
Locality
Comanche mine, Mono Co., California, United States 
Formula
Cu2Sb2(O,OH)7 
Availability
Available
Price
$40.00
Size
4.5 x 3 x 1.5 cm - Miniature 
Tagged
copper  

Partzite is not an actual IMA mineral. Instead they think that it is very similar to Cuproromeite. Scratching the metallic areas does produce a dark green color and its streak is dark olive green. The metallic large grain is 1.5cm and is probably tarnished.


Collection
RC Stamberg Collection

Pseudomalachite

with Copper - #RS58168
Locality
Erl, Kasbach-Ohlenberg, Linz am Rhein, Rhineland-Palatinate, Germany 
Formula
Cu5(PO4)2(OH)4 
Availability
Available
Price
$85.00
Size
8.5 x 4 x 5 cm - Sm Cabinet 
Tagged
phosphate , copper  

A great locality specimen of pseudomalachite in a large 3.5cm cavity in Quartz. Interesting that there are Copper crystals at the center of the specimen.


Pseudomalachite

Formula
Cu5(PO4)2(OH)4 
Crystal System
Monoclinic 
Crystal Habit
Botryoidal, Massive, Stalactitic 
Cleavage
Imperfect, None, None 
Luster
Vitreous - Greasy 
Color
blue green, green, dark green, black green 
Streak
bluish green 
Class
Monoclinic - Prismatic 
Fracture
Conchoidal 
Hardness
4-5 
Collection
RC Stamberg Collection

Spinel

var. pleonaste - #58433
Locality
Monte Somma, Vesuvius, Campania, Italy 
Formula
MgAl2O4 
Availability
Available
Price
$45.00
Size
9 x 7 x 4 cm - Sm Cabinet 

An antique specimen with an old handwritten label on the backside. It is a very rich specimen full of octahedral, black Spinel, variety pleonaste, crysatls to 1mm.


Spinel

Formula
MgAl2O4 
Crystal System
Isometric 
Crystal Habit
Euhedral Crystals, Massive - Granular 
Cleavage
None, None, None 
Luster
Vitreous (Glassy) 
Color
colorless, red, blue, green, brown 
Streak
grayish white 
Class
Isometric - Hexoctahedral 
Fracture
Uneven 
Hardness
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