OBSIDIAN SPECIMENS

Obsidian forms following an extrusive, felsic (high silicate content) lava eruption. The lava cools quickly, preventing crystal formation and instead cooling into a material with characteristics similar to glass. When given enough time to cool, obsidian (volcanic glass) can form crystals in a variety of different colors, depending on composition.
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Specimens
9 Items ($15 to $25)
Colorful Sieber “Agate” Copper Slag - Copper Smelting Byproduct #305698
1.65" Colorful Sieber “Agate” Copper Slag - Copper Smelting Byproduct
$25
 
Colorful Sieber “Agate” Copper Slag - Copper Smelting Byproduct #305695
1.2" Colorful Sieber “Agate” Copper Slag - Copper Smelting Byproduct
$22
 
Colorful Sieber “Agate” Copper Slag - Copper Smelting Byproduct #305694
1.2" Colorful Sieber “Agate” Copper Slag - Copper Smelting Byproduct
$22
Colorful Sieber “Agate” Copper Slag - Copper Smelting Byproduct #305693
1.1" Colorful Sieber “Agate” Copper Slag - Copper Smelting Byproduct
$19
 
Colorful Sieber “Agate” Copper Slag - Copper Smelting Byproduct #305690
1.05" Colorful Sieber “Agate” Copper Slag - Copper Smelting Byproduct
$19
 
Colorful Sieber “Agate” Copper Slag - Copper Smelting Byproduct #305686
.85" Colorful Sieber “Agate” Copper Slag - Copper Smelting Byproduct
$15
Colorful Sieber “Agate” Copper Slag - Copper Smelting Byproduct #305699
1.45" Colorful Sieber “Agate” Copper Slag - Copper Smelting Byproduct
SOLD
SOLD
 
Mahogany Obsidian Section - Utah #279872
6" Mahogany Obsidian Section - Utah
SOLD
SOLD
 
Colorful Sieber “Agate” Copper Slag - Copper Smelting Byproduct #305687
.95" Colorful Sieber “Agate” Copper Slag - Copper Smelting Byproduct
SOLD
SOLD