Natural volcanic glass formations and obsidian varieties from Tanzania's active volcanic regions. Unique specimens for specialty collections.
Unique formations from Tanzania's volcanic activity
125g • Natural • Mirror finish
Volcanic Glass
89g • Natural • Banded pattern
Natural Banding
156g • Natural • Color flash
Iridescent Flash
2.3kg • Natural • Original shape
Aerodynamic Form
456g • Natural • Vesicular texture
Gas Bubble Texture
789g • Natural • Fresh formation
Recent Formation
Type | Color Range | Transparency | Size Range | Grade Notes | Formation | Origin |
---|---|---|---|---|---|---|
Black Obsidian | Black to dark gray | Opaque to translucent | 50g-2kg | Mirror-like finish possible | Rapid cooling lava | Ngorongoro region |
Mahogany Obsidian | Black with brown bands | Opaque | 30g-1.5kg | Natural banding patterns | Layered volcanic flow | Kilimanjaro slopes |
Rainbow Obsidian | Black with color flash | Opaque with iridescence | 40g-800g | Spectral color displays | Mineral inclusions | Meru district |
Volcanic Bombs | Gray to reddish-brown | Opaque | 500g-10kg | Original aerodynamic shape | Airborne lava chunks | Active crater sites |
Pumice | White to gray | Opaque | 100g-5kg | Highly vesicular texture | Gas-rich lava foam | Oldoinyo Lengai |
Volcanic specimens in stock
Natural glass formations from Tanzania's volcanic regions for specialty collections.