Teal Obsidian Identification Guide
Identify teal-colored glassy obsidian, recognize that most teal material is manmade glass, and separate it from natural obsidian and chalcedony.
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What Teal Obsidian Looks Like
"Teal obsidian" is sold as blue-green volcanic glass, but natural obsidian is essentially never a true vivid teal—most teal, blue, and green "obsidian" on the market is manufactured glass (slag or art glass). Genuine natural obsidian colors are black, brown, mahogany, gray, and (sheen varieties) muted green; bright transparent teal is a red flag for manmade glass.
- Color: blue-green to teal, often vivid and uniform.
- Luster: bright, glassy (vitreous).
- Transparency: transparent to translucent.
- Form: massive glass, often in tumbled or molded shapes; conchoidal fracture.
Step-by-Step Field ID Checklist
- Judge the color honestly. Vivid, even teal is characteristic of dyed/manufactured glass, not natural obsidian.
- Look for mold marks and seams. Manufactured glass often shows seams, flat molded bases, or perfectly round bubbles.
- Check bubbles. Lots of large, perfectly spherical bubbles indicate slag/art glass; natural obsidian has fewer, irregular bubbles and flow banding.
- Glass-luster + conchoidal fracture confirm it is some kind of glass (natural or manmade).
- Hardness. ~5-5.5, like all silica glass—scratched by quartz.
- Streak. White.
Key Diagnostic Tests
- Hardness: ~5-5.5 (both obsidian and manmade glass overlap here).
- Streak: white.
- Fracture: conchoidal, no cleavage.
- Density: obsidian ~2.35-2.6; leaded/art glass can be higher (heavier feel)—a notably heavy teal "glass" suggests manmade leaded glass.
- Acid: inert.
Common Look-Alikes
- Manufactured/slag glass: the most likely true identity of teal "obsidian"—look for seams, even color, and uniform bubbles.
- Natural obsidian (genuine): black, brown, or with muted rainbow/green sheen from inclusions, never bright transparent teal.
- Chalcedony/agate (dyed teal): harder (7), waxy, no gas bubbles, and not glassy-brittle.
- Apatite/fluorite (teal): crystalline with cleavage, unlike glassy fracture.
Where It Is Found
Because teal obsidian is overwhelmingly manmade, it has no natural locality; it is produced as colored glass. Genuine natural obsidian comes from rhyolitic volcanic regions (western US, Mexico, Iceland, Armenia), but not in vivid teal.
Frequently asked questions
Is teal obsidian real or fake?
Almost all teal obsidian is manufactured glass, not natural obsidian. Natural obsidian does not occur in vivid transparent teal, so bright blue-green material is virtually always manmade slag or art glass.
How can you tell teal obsidian from natural obsidian?
Natural obsidian is black, brown, or has muted sheen, with irregular bubbles and flow banding. Manmade teal glass shows even color, mold seams, and perfectly round bubbles.
What does real obsidian look like?
Genuine obsidian is glassy and usually black, gray, brown, or mahogany, sometimes with a subtle gold, silver, or rainbow sheen, and it breaks with smooth shell-like conchoidal surfaces.
How do you tell teal obsidian from dyed chalcedony?
Dyed teal chalcedony is harder (Mohs 7), waxy rather than glassy, and contains no gas bubbles, whereas teal glass is softer (about 5-5.5), brittle-glassy, and often bubbly.