igneous
Lava Rock (Basaltic Scoria)
Vesicular Basalt
Hardness: 5-6 (Mohs scale); Color: Black or dark grey; Luster: Dull/Earthy; Structure: Vesicular (full of holes); Specific Gravity: Relatively low due to porosity.
- Hardness
- 5-6 (Mohs scale)
- Color
- Black or dark grey
- Luster
- Dull/Earthy
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Physical properties
Hardness: 5-6 (Mohs scale); Color: Black or dark grey; Luster: Dull/Earthy; Structure: Vesicular (full of holes); Specific Gravity: Relatively low due to porosity.
Formation & geological history
Formed from the rapid cooling of gas-rich basaltic lava. The holes (vesicles) are created by gas bubbles trapped in the molten rock as it solidifies. Found in volcanic regions globally.
Uses & applications
Used extensively in jewelry as aromatherapy beads, in landscaping, as aquarium substrates, and in industrial filtration systems.
Geological facts
Lava rock is one of the oldest and most abundant minerals on Earth. Because it is porous, it is often used in diffuser jewelry to hold essential oils.
Field identification & locations
Identify by its light weight relative to size, dark color, and characteristic 'pitted' or 'sponge-like' surface texture. Commonly found near active or extinct volcanoes.
