Basalt (Lava Rock) and Dyed Glass/Quartz

Physical Properties

Hardness: 5-6 (Basalt). Color: Black to dark gray for the lava beads; bright neon blue for the accent beads. Luster: Dull/earthy for lava; vitreous for blue beads. Structure: Vesicular (porous) due to trapped gas bubbles.

Formation & Geological History

Formed from the rapid cooling of magnesium-rich and iron-rich lava at the earth's surface. The pits (vesicles) are created by gas escaping as the magma solidifies.

Uses & Applications

Used primarily in jewelry as 'diffuser beads' for essential oils, landscaping (lava rocks), and decorative accessories.

Geological Facts

Basalt is the most common rock on Earth's surface and makes up most of the ocean floor. The blue beads in this bracelet are likely 'crackle quartz' or glass that has been heat-treated and dyed to achieve the neon blue color.

Field Identification & Locations

Identify in the field by its dark color, heavy weight (if solid), or porous sponge-like texture (if scoria). It is commonly found in volcanic regions like Hawaii, Iceland, and the Pacific Northwest.

Identified on: 4/18/2026

Mode: Standard