Matte Obsidian

Matte Obsidian is standard obsidian finished or weathered to a dull, non-reflective surface. As with frosted obsidian, the matte look is a surface property, not a different glass. The body remains glossy volcanic glass once chipped or broken.

The finish results either from natural weathering and abrasion or, more often in retail, from intentional sandblasting or acid etching to create a modern, soft-touch appearance popular in beads and jewelry.

Matte and frosted obsidian are essentially the same idea, with "matte" emphasizing the velvety, non-glossy look.

The glass forms by rapid cooling of felsic lava. The matte texture is imposed afterward.

Naturally, wind-blown sand, stream abrasion, and slow surface hydration roughen the glass at a microscopic scale, scattering light and dulling the shine. Commercially, finished obsidian is sandblasted with fine grit or briefly acid-etched to achieve a uniform matte surface on demand, which is why most matte obsidian on the market is treated rather than naturally weathered.

Surface: Uniform, velvety, non-reflective; micro-pitting visible under a loupe.

Interior: A fresh break shows glossy black or gray glass with conchoidal fracture.

Hardness: ~5-6.

Streak: White.

Look-alikes: Matte black stones such as basalt or black tourmaline are not glassy and feel grittier or harder; basalt is a crystalline rock. Matte obsidian still warms quickly in the hand and breaks with a glassy conchoidal fracture.

Matte Obsidian is widely used in contemporary jewelry, especially matte black bead bracelets and necklaces, where the non-glossy look is fashionable. It is also used for decorative carvings and spheres.

Its metaphysical associations mirror those of black obsidian, protection and grounding, which are traditional rather than scientific. The matte finish is cosmetic and does not alter composition, hardness, or intrinsic value.