Igneous Rocks · uncommon
Rainbow Obsidian
Rainbow obsidian is a type of volcanic glass that displays bands of colorful iridescence when polished and viewed in bright light.
Also known as: volcanic glass, iridescent, mexican obsidian.
Rainbow Obsidian properties at a glance
| Type | Igneous Rocks |
|---|---|
| Chemical formula | SiO2 (70-75%) |
| Mohs hardness | 5.5 |
| Crystal system | amorphous |
| Luster | vitreous |
| Streak | White |
| Cleavage | None |
| Fracture | Conchoidal |
| Specific gravity | 2.4 |
| Transparency | opaque |
| Common colors | Black with rainbow sheen, Purple, Green, Gold |
| Rarity | uncommon |
Geology & background
Forms like regular obsidian but contains nanoparticle inclusions of magnetite that create iridescent bands when polished.
Prized by ancient Mesoamerican civilizations for ritual objects and jewelry.
How to identify Rainbow Obsidian
- Check whether the specimen's color and texture match typical Rainbow Obsidian examples.
- Photograph a fresh surface in natural light and avoid shadows, glare, or wet surfaces.
- Use hardness, streak, luster, grain size, and locality together; no single trait is enough for every specimen.
Full Rainbow Obsidian identification guide: checklist, home tests and look-alikes →
Rainbow Obsidian vs similar stones
Not sure it isn't something else? Side-by-side comparisons with the stones most often confused with Rainbow Obsidian.
Where Rainbow Obsidian is found
Rainbow Obsidian is reported from multiple localities or geological settings. Exact locality should be verified from specimen provenance, maps, or field notes.
How much is Rainbow Obsidian worth?
| Entry-level specimen | $10 |
|---|---|
| Typical collector specimen | $50 |
| Premium specimen | $200+ |
Value depends on size, condition, color, crystal quality, locality, rarity, preparation, and provenance. Treat this as educational guidance, not an appraisal.
Common uses
- Jewelry
- Decorative objects
- Spiritual practices
Interesting facts
- The rainbow effect is caused by microscopic magnetite inclusions
- Most comes from Mexico
- Each piece has unique color patterns
Care & safety
Treat Rainbow Obsidian as a collector specimen unless hardness, cleavage, and fracture are confirmed.
Avoid inhaling dust. Do not cut, grind, or polish unknown specimens without eye protection and a properly rated respirator.
Rainbow Obsidian FAQ
What is Rainbow Obsidian?
Rainbow obsidian is a type of volcanic glass that displays bands of colorful iridescence when polished and viewed in bright light.
How much is Rainbow Obsidian worth?
Entry-level Rainbow Obsidian specimens sell for around $10, a typical collector specimen for about $50, and premium pieces for $200 or more. Value depends on size, condition, color, crystal quality, locality, rarity, preparation, and provenance. Treat this as educational guidance, not an appraisal.
How hard is Rainbow Obsidian?
Rainbow Obsidian has a Mohs hardness of 5.5. It is about as hard as window glass: a knife barely marks it, while a steel file (Mohs 6.5) will.
Where is Rainbow Obsidian found?
Notable sources of Rainbow Obsidian include Mexico and USA. Forms like regular obsidian but contains nanoparticle inclusions of magnetite that create iridescent bands when polished..
What is Rainbow Obsidian used for?
Rainbow Obsidian is used for jewelry, decorative objects, and spiritual practices.
