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0 item @ $0.00  

Germany

Thursday, 30 August 2012 10:00 AM

Minerals from classic German localities including laueite and rockbridgeite from Hagendorf and silver bearing minerals from Freiberg, Saxony; Segen Gottes, Baden; Schneeberg district in Saxony; and Ifeld Manganite.

Acanthite

on Calcite - #PD32993
Locality
Berschert-Gluech mine, Freiberg dist., Saxony, Germany 
Formula
Ag2
Availability
Sold
Size
5.5 x 4.5 x 2.5 cm - Sm Cabinet 
Tagged
sulfide  

Dull, greyish black, melted looking crystals of Argentite (Acanthite) to 1cm on Calcite matrix with Pyrite. This is really a neat specimen.


Acanthite

Formula
Ag2
Crystal System
Monoclinic 
Crystal Habit
Blocky, Skeletal, Arborescent 
Cleavage
poor to none 
Luster
Metallic 
Color
lead gray, gray, iron black 
Streak
shining black 
Class
Monoclinic - Prismatic 
Fracture
Sectile 
Hardness
2-2.5 
Collection
Phillips Collection
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Argyrodite

#PD32949
Locality
Himmelsfurst mine, Freiberg dist., Saxony, Germany 
Formula
Ag8GeS6 
Availability
Sold
Size
2 x 2 x 1.5 cm - Thumbnail 
Tagged
sulfide  

"Large", 5mm, well formed crystals of rare Argyrodite, a Ag-Ge sulfide. Excellent specimen!


Argyrodite

Formula
Ag8GeS6 
Crystal System
Orthorhombic 
Crystal Habit
Subhedral Crystals, Massive - Granular 
Cleavage
None, None, None 
Luster
Metallic 
Color
black, steel gray 
Streak
grayish black 
Class
Orthorhombic - Pyramidal 
Fracture
Brittle - Conchoidal 
Hardness
2.5 
Collection
Phillips Collection

Arsenic

slickenside - #PD33954
Locality
St. Andreasberg dist., Harz, Lower Saxony, Germany 
Formula
As 
Availability
Sold
Size
6 x 5 x 1 cm - Sm Cabinet 
Tagged
native element  

Amazingly shiny and naturally polished black slickenside composed of Arsenic. Number on label matches that of specimen.


Arsenic

Formula
As 
Crystal System
Trigonal 
Crystal Habit
Nodular, Reniform, Lamellar 
Cleavage
Perfect, None, None 
Luster
Metallic 
Color
lead gray, gray, white 
Streak
black 
Class
Trigonal - Hexagonal Scalenohedral 
Fracture
Uneven 
Hardness
3.5 
Collection
Phillips Collection
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Arsenopyrite

#PD33931
Locality
Freiberg dist., Erzgebirge, Saxony, Germany 
Formula
FeAsS 
Availability
Sold
Size
7 x 6 x 4 cm - Sm Cabinet 
Tagged
sulfide  

A good representative specimen from this districe with silvery crystals to 4mm. Showing some Pyrite decay. Originated from the US National museum with tag.


Arsenopyrite

Formula
FeAsS 
Crystal System
Monoclinic 
Crystal Habit
Striated, Euhedral Crystals, Prismatic 
Cleavage
one distinct 
Luster
Metallic 
Color
tin white, light steel gray 
Streak
black 
Geological Setting
Widespread. Most commonly found in medium to high temperature veins.  
Class
Monoclinic - Prismatic 
Fracture
Brittle 
Hardness
5.5 to 6 
Collection
Phillips Collection

Baryte

with Calcite - #PD32952
Locality
Freiberg dist., Erzgebirge, Saxony, Germany 
Formula
BaSO4 
Availability
Sold
Size
6.5 x 5 x 4 cm - Sm Cabinet 
Tagged
sulfate  

White, tabular crystals in rosette habit to 6mm on Pyrite and Calcite matrix.


Baryte

Formula
BaSO4 
Crystal System
Orthorhombic 
Crystal Habit
Tabular, Prismatic, Massive - Fibrous 
Cleavage
Perfect, Perfect, Imperfect 
Luster
Vitreous (Glassy) 
Color
white, yellowish white, grayish white, brownish white, dark brown 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Fracture
Uneven 
Hardness
3-3.5 
Collection
Phillips Collection
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Baryte

#PD33937
Locality
Halsbrucke, Freiberg dist., Erzgebirge, Saxony, Germany 
Formula
BaSO4 
Availability
Sold
Size
14 x 10 x 4 cm - Cabinet 
Tagged
sulfate  

This is a large, heavy, very lusterous and impressive group of Baryte crystals.The crystals are pereferentially terminated with a brownish impurity. Excellent showy specimen with just a minor dign on the backside and considering how old and soft this specimen is, that is a minor miracle.


Baryte

Formula
BaSO4 
Crystal System
Orthorhombic 
Crystal Habit
Tabular, Prismatic, Massive - Fibrous 
Cleavage
Perfect, Perfect, Imperfect 
Luster
Vitreous (Glassy) 
Color
white, yellowish white, grayish white, brownish white, dark brown 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Fracture
Uneven 
Hardness
3-3.5 
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