Turquoise Obsidian Identification Guide
A field guide to recognizing turquoise obsidian, a marketing name for greenish-blue volcanic glass, and separating it from dyed and man-made imitations.
Read the full Turquoise Obsidian encyclopedia entry →
What Turquoise Obsidian Looks Like
"Turquoise obsidian" is a trade name for obsidian (natural volcanic glass) that shows a turquoise-to-teal blue-green color. True obsidian is almost never naturally turquoise; most material sold under this name is man-made glass (slag glass) or dyed/backed glass. Genuine obsidian is glassy with a brilliant vitreous luster, ranges from translucent on thin edges to opaque, and breaks with smooth conchoidal (shell-like) fracture leaving razor-sharp edges. Color in real glass is even and saturated; you should see no crystal grains.
Step-by-Step Field-ID Checklist
- Look at luster and surface. A bright, wet-looking glassy shine on a fracture surface points to glass (natural or manufactured).
- Check for conchoidal fracture. Curved, ridged break surfaces with no flat cleavage planes are diagnostic of glass.
- Hold to light. Obsidian and slag glass are usually translucent at thin edges; a uniform turquoise glow suggests artificial glass.
- Inspect for bubbles and swirls. Round gas bubbles and flow swirls are extremely common in man-made glass and rare in natural obsidian.
- Test hardness. Glass sits around Mohs 5-5.5 and will scratch easily with a steel file but not with a copper coin.
- Streak test. Expect a white/colorless streak.
Key Diagnostic Tests
- Mohs hardness: 5-5.5. A steel knife scratches it; it scratches window glass with effort.
- Streak: White to colorless.
- Fracture: Conchoidal, no cleavage.
- Magnetism: None.
- Acid: No reaction (silica glass).
- Density: Natural obsidian ~2.35-2.6 g/cm3; manufactured glass is similar, so density alone won't separate them.
- Bubble check (most useful): Abundant perfectly spherical bubbles strongly indicate manufactured glass.
Common Look-Alikes
- Genuine turquoise: Opaque, waxy, Mohs 5-6, often with brown/black matrix veining; never has conchoidal glassy fracture.
- Manufactured slag/art glass: The most common substitute; betrayed by uniform color, swirls, and round bubbles.
- Dyed howlite or magnesite: Chalky, porous, takes dye unevenly along veins; far less glassy.
- Chrysocolla/gem silica: Botryoidal or banded, attached to host rock, not a glassy homogeneous block.
- Amazonite: Has feldspar cleavage and a gridiron sheen, unlike featureless glass.
Where It Is Found
Natural blue-green obsidian is genuinely rare; most "turquoise obsidian" is produced glass sold in lapidary and metaphysical markets. Authentic obsidian forms in young silica-rich lava flows in volcanic regions such as the western United States (Oregon, California, Idaho), Mexico, Iceland, and Armenia. Treat any vividly even turquoise "obsidian" as likely artificial unless documented otherwise.
Frequently asked questions
Is turquoise obsidian real or man-made?
Most turquoise obsidian on the market is man-made slag or art glass. Natural obsidian is almost never turquoise; genuine examples are very rare, so vivid, uniformly colored pieces are usually manufactured.
How can you tell if turquoise obsidian is glass?
Look for perfectly round gas bubbles, swirl patterns, and a completely uniform color. These features indicate manufactured glass rather than natural volcanic glass.
What does turquoise obsidian look like?
It is a glassy, translucent-to-opaque blue-green to teal material with a bright vitreous luster and smooth, curved (conchoidal) fracture surfaces.
Turquoise obsidian vs real turquoise: how do they differ?
Real turquoise is opaque, waxy, and often shows matrix veining, with no glassy fracture. Turquoise obsidian is glassy, breaks conchoidally, and may show bubbles.
Turquoise Obsidian identified by the community
Recent Turquoise Obsidian specimens identified with Rock Identifier.
