mineral

Black stone bead bracelet

Likely black tourmaline (schorl), though identification is uncertain from the image

AI-generated identification · may be incorrect

Opaque black, dull to subvitreous luster, commonly striated prismatic crystals; Mohs hardness 7–7.5, brittle, specific gravity about 3.0–3.3. The beads appear polished and rounded, obscuring diagnostic crystal form.

Identified September 8, 2026More mineral →

Explore Black stone bead bracelet in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

If tourmaline, it formed in boron-rich granitic pegmatites and hydrothermal veins, generally during the Mesozoic or younger depending on locality. Other possibilities include black obsidian, onyx, hematite, or dyed stone.

Uses & applications

Used as ornamental beads, jewelry, carvings, and mineral specimens; black tourmaline is also popular in metaphysical products. It has little industrial use in this bead form.

Geological facts

Schorl is the most common tourmaline species and may show strong electrical polarization when heated or rubbed (the tourmaline effect).

Field identification & locations

Test with a loupe for elongated striations or fibrous texture; tourmaline is harder than steel and glass, but hardness testing may damage jewelry. Exact identification requires an individual bead, streak, density, or laboratory analysis.