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Mixed Minerals

Friday, 28 July 2023 06:00 PM

Introducing the "Mixed Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including beryl, stephanite, and willemseite and more from places like Bennett quarry, Buckfield, Oxford Co., Maine, United States, Svornost mine, Jáchymov, Erzgebirge, Bohemia, Czech Republic, and Kolonodale Ni dep., Petasia, Sulawesi Tengah, Sulawesi, Indonesia.

Beryl

in Albite with Muscovite - #DL62165
Locality
Bennett quarry, Buckfield, Oxford Co., Maine, United States 
Formula
Be3Al2Si6O18 
Availability
Available
Price
$75.00
Size
7 x 6 x 4 cm - Sm Cabinet 
Tagged
beryllium , pegmatite mineral  

Light green etched Beryl in white Microcline with pockets of Cookeite and crystals of apatite.


Beryl

Formula
Be3Al2Si6O18 
Crystal System
Hexagonal 
Crystal Habit
Crystalline - Coarse, Prismatic, Columnar 
Cleavage
Imperfect, None, None 
Luster
Vitreous - Resinous 
Color
green, blue, yellow, colorless, pink 
Streak
white 
Class
Hexagonal - Dihexagonal Dipyramidal 
Fracture
Brittle - Conchoidal 
Hardness
7.5-8 
Collection
Dr. David London Collection
Mineralpedia
View Beryl
On Dakota Matrix
Previously Sold Beryl
On Dakota Matrix
Other Available Beryl
WebMineral
View Beryl
Mindat
View Beryl

Stephanite

#KR62006
Locality
Svornost mine, Jáchymov, Erzgebirge, Bohemia, Czech Republic 
Formula
Ag5SbS4 
Availability
Available
Price
$450.00
Size
3.6 x 2.5 x 1.8 cm - Miniature 
Tagged
sulfide , silver  
Special Info
Antique Specimen 

This specimen originated from the Czech National Museum and is from the type locality circa 1845. It comes with the Czech label as well as the label from the late Josef Vajdak, a famous Czech mineralogist.

The crystal group shown in the second photo is 4mm and shows exceptional repeated twinning forming pseudohexagonal groups. There are several other crystals on the order of 1mm and less.


Stephanite

Formula
Ag5SbS4 
Crystal System
Orthorhombic 
Crystal Habit
Pseudo Hexagonal, Tabular, Massive 
Cleavage
Imperfect, Poor, None 
Luster
Metallic 
Color
lead gray, black 
Streak
black 
Class
Orthorhombic - Pyramidal 
Fracture
Sub Conchoidal 
Hardness
2-2.5 
Collection
Kenneth Raabe Collection
Special Info
Antique Specimen

Willemseite

#BAC62205
Locality
Kolonodale Ni dep., Petasia, Sulawesi Tengah, Sulawesi, Indonesia 
Formula
Ni3Si4O10(OH)2 
Availability
Available
Price
$75.00
Size
1.7 x 1.2 x 1 cm - Thumbnail 
Tagged
nickel  

Light green waxy crusts.


Willemseite

Formula
Ni3Si4O10(OH)2 
Crystal System
Monoclinic 
Cleavage
Perfect, None, None 
Color
light green 
Streak
greenish white 
Class
Monoclinic - Prismatic 
Hardness
Collection
William & Anne Cook Collection

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