Obsidian Stone: The Complete Guide
Born of volcanic fire, black and deep, obsidian stone is at once a stone of protection and an object of real beauty. As a maker who works with it every day, here's everything I've learned about it.
What is obsidian stone?
Obsidian is a natural volcanic glass. It forms when silica-rich lava cools so fast that its minerals never get the chance to crystallise: what you end up with is a glassy, smooth, glossy material rather than an ordinary crystalline rock.
Mineralogically, that means it isn't strictly a mineral at all but an amorphous mineraloid, made mostly of silica (SiO₂). Its hardness sits at around 5 to 5.5 on the Mohs scale, and its fracture is described as "conchoidal": it breaks into flakes with extraordinarily sharp edges. You'll find it in volcanic regions the world over, Mexico, the United States, Iceland, Italy (the Lipari Islands), Armenia.
The very first obsidian I held, I kept in my coat pocket for three days. I couldn't tell you why: I just needed to feel it there, smooth and cool, against my hand.
If you want to go deeper, I've written a whole article on how obsidian is formed. And because those edges really are sharp, it's worth reading my note on obsidian dangers and precautions too.
Origin & history
Its deep black comes from iron and magnesium. Thanks to that razor-sharp fracture, obsidian kept humanity company long before it ever became jewellery: from prehistory onwards it was worked into blades, arrowheads and tools.
Mesoamerican civilisations, the Aztecs, the Maya, also polished it into mirrors. It was associated with the god Tezcatlipoca, the "smoking mirror". That inheritance is where its nickname "mirror of the soul" comes from: the dark surface seems to invite you inwards. There's more on that lineage in the gods of obsidian and obsidian myths and legends, and on the mirrors themselves in the black obsidian scrying mirror.
The "mirror of the soul" idea moves me a great deal. When I polish a stone at the studio and catch my own dark reflection in it, I always feel as though it's quietly asking me something.
The varieties of obsidian
Obsidian is nearly always dark. Its "colours" and patterns actually come from its inclusions, crystals, gas bubbles, magnetite nanoparticles, playing with the light. Here are the loveliest:
Black obsidian
The most common: black, smooth and glassy. The protective stone par excellence.
Rainbow obsidian
Blue and violet sheen appears as the light shifts. Softness and intuition. Read more
Rainbow sheen
Multicoloured iridescence from magnetite nanoparticles. The showiest of them all. Read more
Mahogany
Black mixed with red-brown, from iron. Grounding and vitality. Read more
My own favourite is rainbow obsidian. The first time I tilted one towards the window and that blue-violet veil appeared, I genuinely thought it had winked at me. I've never got tired of it since.
The full list of natural obsidians
Beyond the best-known, here's a fairly complete picture of the obsidians you'll actually come across:
- Black obsidian, the most common, black and glassy.
- Snowflake, black flecked with white (cristobalite crystals).
- Mahogany, red-brown, from iron and haematite.
- Apache tears, small dark pebbles, naturally rounded and slightly translucent.
- Gold and silver sheen, a golden or silvery veil, created by aligned gas bubbles.
- Rainbow, multicoloured iridescence from magnetite nanoparticles.
The rare and sought-after varieties
- Fire obsidian, the most prized of all: fine magnetite layers create opal-like flashes (mostly from Oregon).
- Midnight lace, fine, tightly contorted black ribbons.
- Spiderweb, a network of pale veins like a web.
- Peacock velvet / blue pearl, lavender, green and violet waves (Mexico), revealed once the stone is polished.
- Pumpkin and peanut, banded or spherulitic varieties.
- Tri-flow, three tones running together (black, red, translucent).
There's a fuller breakdown of the family in my article on the types of obsidian stones.
What about bright blue, green or red obsidian?
Be careful here. The transparent, brightly coloured "obsidians" sold all over the place (electric blue, apple green, red, aqua) are almost always manufactured glass, not natural stone. Real obsidian is dark; the genuinely coloured varieties that do exist (a matte green from Mexico, for instance) are opaque and understated. I explain how to tell the difference in spotting a real obsidian.
Plainly, if an "obsidian" is see-through and a brilliant blue or green, it's almost certainly glass. Real obsidian stays deeply dark.
Meaning & symbolism
Obsidian is above all a stone of protection and of truth. Like a mirror, it's held to reflect back what needs to be seen: buried feelings, our shadow places, the things we'd sometimes rather not look at. It's called a direct stone, one that doesn't go round the houses, hence its reputation for encouraging honesty with yourself and keeping you rooted in what's real.
I go through where those associations come from, and what they've meant across cultures, in what obsidian means.
Obsidian stone properties in crystal healing
In crystal healing, obsidian is credited with several properties:
- Protection: it's said to act as a shield against negative energies.
- Grounding: linked to the root chakra, it's held to reconnect you with the earth and help you re-centre.
- Emotional release: it's said to accompany blockages surfacing and clearing.
- Clarity and truth: it's credited with encouraging discernment and lucidity.
Energetically, black obsidian is tied mainly to the root chakra, while rainbow obsidian is sometimes associated with the third eye, there's a full breakdown in obsidian and the chakras. I develop all of this in my article on obsidian for protection and grounding.
A customer once told me she wore her obsidian bracelet on high-stakes days, like a small talisman of courage. I promise nothing magic; but I find those little rituals of confidence genuinely precious.
Worth knowing, the properties described here belong to crystal healing, a wellbeing practice grounded in tradition and belief. They are not a therapeutic claim and are in no way a substitute for the advice of a health professional.
How to use obsidian day to day
The simplest way to enjoy obsidian is to wear it, keeping it close:
- as a bracelet, for a quiet presence through the whole day;
- as a pendant or a necklace, to keep the stone near your heart;
- as a ring, to have it in view.
You can also place a stone at home, in a living space or near the front door, or hold it in your hand during a quiet moment or a meditation, there's a guided version in obsidian meditation for the root chakra.
Cleansing & charging your obsidian
Like every stone, obsidian gets cleansed and charged on a regular rhythm, especially after you buy it and if you wear it often.
Cleansing it
Through smoke, a brief pass under clear water, or by resting it on a quartz cluster. Avoid salt and salt water, which damage it over time.
Charging it
By moonlight (the full moon is ideal), on an amethyst geode, or in contact with the earth. Avoid long sun exposure. I set out the full method in cleansing and charging your obsidian, and for the physical side, dust and shine, see how to clean your obsidian.
My own ritual: on full moon nights I set my stones on the studio windowsill. Come morning it's probably irrational, but they always look more awake to me.
How to spot a real obsidian
With stones as popular as they are, tinted glass imitations are everywhere. A few markers for identifying genuine obsidian:
- it usually shows minute bubbles or inclusions and slight irregularities;
- it feels cool to the touch and warms slowly;
- its fracture is conchoidal (curved), never perfectly clean;
- imitation glass, by contrast, is too "perfect": uniform colour, even transparency, small round bubbles, suspiciously light in the hand.
Early on I got caught out by a "blue obsidian" I'd found online: a gorgeous electric blue… and completely fake. That was the day I decided to work only with stones whose provenance I know.
The surest route is buying from a seller you trust, who guarantees natural stones, that's a commitment I hold to for every piece I make. If you're weighing up what a piece should cost, my article on obsidian price and value will help.
Which obsidian piece should you choose?
It depends what you're after:
- for everyday protection, a black obsidian bracelet is the simplest choice;
- to keep the stone near your heart, go for a pendant or a necklace;
- for the beauty of its sheen, let yourself be tempted by a rainbow or a gold sheen obsidian;
- choosing for someone else? My notes on choosing and gifting and on obsidian for men may help.
Everything I make is handmade, with stones chosen one at a time, and posted to Australia. Have a browse through all my obsidian pieces to find the one that's yours.
Frequently asked questions
Can obsidian go in water?
Is obsidian right for everyone?
What's the difference between obsidian and onyx?
Does blue or green obsidian exist?
Can obsidian be worn every day?
Ready for your obsidian stone?
Bracelets, necklaces, pendants and rings in obsidian, handmade with natural stones and posted to Australia.