Obsidian: The Glass the Earth Made in a Second

There is something that makes obsidian different from almost every other stone I work with: it had no time.

The other stones I use — amethyst, quartz, carnelian — formed over thousands or millions of years, crystal after crystal, silently underground. Obsidian did not. It is lava that emerged from a volcano and cooled so quickly — practically in a geological instant — that its atoms had no time to arrange themselves into an ordered structure.

That is why, technically, obsidian is not even a mineral: it is glass. Experts call it a mineraloid, because it lacks precisely what makes a mineral a mineral: an ordered internal structure.

I find something very honest in this, for a stone that I so often associate in my work with grounding. It did not form gradually. It formed in a moment of sudden rupture, and from there it remained exactly what it was: still, with no further transformation possible.

Download the Obsidian Technical Data Sheet

What It Really Is

Obsidian forms when lava very rich in silica — usually between 65 and 80% — erupts from a volcano and encounters something that cools it almost instantly: cold air, water, or the edge of a lava flow.

Its viscosity is so high that the atoms cannot organize themselves into crystals before everything solidifies. The result is a natural, amorphous glass, without a true crystalline internal structure, which breaks with a conchoidal fracture: curved, smooth, and capable of producing edges thinner and sharper than those of a metal scalpel.

It is no coincidence that for much of human history, before metals, obsidian was one of the most precise cutting materials available.

Its characteristic black color comes mainly from microscopic inclusions of magnetite and hematite. When these inclusions arrange themselves in particular ways, rarer varieties appear — but I will come back to those at the end.

Where It Comes From, and Who Works With It

Obsidian can be found wherever relatively recent volcanism has produced silica-rich lava: the western United States — Oregon, California, Yellowstone — Iceland, Italy’s Aeolian Islands, Armenia, Turkey, Japan, Kenya, New Zealand, and Peru.

But Mexico remains one of its most important sources, both in terms of quantity and historical significance.

Mexico contains some of the world’s major deposits, particularly in the Sierra de las Navajas in the state of Hidalgo and in Jalisco.

Here, obsidian was never simply something to extract. For Mesoamerican peoples — Teotihuacan above all — controlling these mines meant controlling a strategic resource of enormous importance. Archaeologists have identified more than 500 pre-Hispanic mining shafts in the Sierra de las Navajas alone, some dating back around two thousand years.

What struck me most while researching extraction ethics is that obsidian does not appear — at least from what I found — to carry the same documented history of exploitation associated with some rarer or more precious stones.

There is a reason for this: obsidian is abundant, often found only a few centimeters or a couple of meters below the surface, and in many areas of Mexico it is still extracted artisanally by families and small communities that have worked this land for generations, as part of a continuing local economy rather than a large-scale industrial mining system.

This does not mean that everything is fine everywhere.

I found one specific report from an archaeologist working in Jalisco describing how, in some unprotected areas, large quantities of high-quality obsidian are sold at extremely low prices and shipped to China. The result is a flow of material that removes local value from a resource that has been central to the identity of these territories for centuries.

It is a real problem, but a different one from, for example, blood diamonds or cobalt. Here we are not talking about documented forced labor or armed conflict, but about a global market that often underpays the people who extract the material — an issue common throughout much of the artisanal semi-precious stone sector worldwide.

If you want to buy obsidian with greater confidence, the most useful thing you can do is simply ask the seller where it comes from. It is a simple question, and anyone working seriously with stones should be able to answer it.

The Real Stories, Before the New Age

This is where I need to be precise, because it is very easy — and I saw it happen constantly while researching this piece — to mix ancient mythology and recent invention as though they were the same thing.

The story with a solid historical foundation is that of Tezcatlipoca, one of the principal deities of the Aztec pantheon.

His name in Nahuatl literally means “Smoking Mirror,” referring to the polished obsidian ritual mirrors used by Aztec priests for divination.

Tezcatlipoca was represented with an obsidian mirror in place of a foot or positioned on his chest, symbolizing his ability to see everything — thoughts, actions, and the destiny of those who looked into it.

This is not a New Age reconstruction. It is documented in direct colonial sources — the friar Bernardino de Sahagún was collecting Aztec testimony as early as the sixteenth century — and confirmed by archaeology.

One of these mirrors, brought to Europe after the Spanish conquest, even ended up in the hands of John Dee, astrologer and court magician to Elizabeth I, who used it in his divinatory sessions. A geochemical analysis published in 2021 confirmed that it came from the mines of Pachuca, Mexico.

Its practical use is equally well documented. The Aztecs and Maya — and, thousands of years earlier, Paleolithic peoples in many parts of the world — used obsidian for blades, arrowheads, and sacrificial knives. Its ability to produce an exceptionally sharp edge made it superior to almost every other material available before metal.

A story that needs to be treated with much greater caution is that of the so-called Apache Tears, small rounded nodules of translucent obsidian found mainly in Arizona.

The story tells of a group of Apache warriors who, surrounded by the U.S. cavalry in the 1870s, chose to throw themselves from a cliff rather than surrender. The tears shed by their women, falling to the ground, were said to have transformed into these black stones.

It is a moving story, and it circulates everywhere as a “traditional Apache legend.”

But when I looked more closely into its origins, I found a reconstruction suggesting that the story may not come from Apache oral tradition itself, but rather from the mid-twentieth century, among Anglo-American mineral collectors and lapidary enthusiasts in Arizona.

In other words, it appears to be modern regional folklore built around a real and tragic historical context — the Apache Wars — rather than an ancient story transmitted directly by Apache people.

That distinction matters before presenting it as ancient Indigenous wisdom. It is more accurate to describe it as twentieth-century American regional folklore inspired by a real historical tragedy.

From Myth to Crystal Healing: Who Created the Modern Meanings?

Here the boundary is much clearer, and it comes with names and dates.

The meanings most commonly attributed to obsidian today — a stone of protection and grounding, a “mirror of the shadow” capable of revealing fears and hidden truths — do not come from Aztec or Paleolithic traditions.

They come from the literature of contemporary crystal healing, which developed in the United States in the 1980s.

One of the first authors to systematize these kinds of associations for a broad audience was Katrina Raphaell, with Crystal Enlightenment (1985), the first volume of her Crystal Trilogy — a book considered by several sources within the field to be one of the starting points of modern Western crystal healing.

A few years later, Melody, with Love Is in the Earth — first published in 1991 — greatly expanded the catalogue of stone-to-meaning correspondences that still circulates in shops and online today.

Later authors such as Judy Hall and Robert Simmons further consolidated and popularized this language.

I am not saying that this makes working symbolically with obsidian any less valid.

I am saying that it is more honest to call it what it is: a recent symbolic tradition, developed largely over the last forty years, rather than knowledge handed down from the Aztecs or Paleolithic peoples.

The two things — documented historical use and contemporary symbolic meaning — can coexist, but only if we do not confuse one with the other.

How Obsidian Is Used Today

In contemporary practice, black obsidian is associated above all with grounding: the idea of bringing attention back into the body, the feet, and the present moment when the mind is running elsewhere.

This is perhaps its most widespread modern meaning, linked to the root chakra within contemporary crystal-healing traditions.

It is also called a “mirror stone,” partly because of its historical ability to be polished into reflective surfaces. In modern crystal healing, this physical characteristic has been transformed into the idea of a tool that helps us look honestly at the more uncomfortable parts of ourselves — what is often called shadow work.

Within this contemporary literature, obsidian is therefore associated particularly with truth and clarity, as a stone believed to make it harder to continue lying to ourselves.

A third widespread interpretation connects it with energetic protection, particularly for people who describe themselves as empathic or especially sensitive to their environment and to the emotions of others.

Within this framework, obsidian is described as a shield capable of absorbing heavy energies before they reach the person wearing it.

Finally, it is often suggested for grief and difficult emotions, an association that in contemporary practice belongs particularly to gentler varieties such as snowflake obsidian and the already mentioned Apache Tears.

Black obsidian, by contrast, is generally considered the most intense and direct form, and is sometimes described as less suitable for people approaching this type of symbolic work for the first time.

It is worth remembering, as with every meaning of this kind, that these are associations developed within crystal-healing literature over approximately the last forty years, not teachings inherited from the historical traditions discussed above.

Personally, I use and offer obsidian in exactly the same way I approach every other stone: not as an object that does something in your place, but as a tangible point to return to while you do the real work — which always remains yours.

How to Care for Obsidian

Obsidian has a hardness of approximately 5–5.5 on the Mohs scale. It is relatively soft for a stone, so it benefits from some care.

Water: A quick rinse is fine, but avoid prolonged soaking. Avoid salt water.

Sunlight: It tolerates direct sunlight better than many stones, but prolonged exposure is still best avoided, particularly with varieties that show iridescent effects such as rainbow, gold, or silver obsidian.

Physical cleaning: Use a soft cloth and, if necessary, lukewarm water with a mild soap. Avoid ultrasonic or steam cleaners.

Impact: Because obsidian is glass, it is more fragile than its glossy, compact appearance might suggest. Store it separately from harder stones that could scratch it.

The Other Varieties

Black is the most common and widespread form, but obsidian exists in many other varieties depending on its inclusions and cooling conditions.

There is snowflake obsidian, with white cristobalite inclusions; mahogany obsidian, reddish because of hematite; rainbow obsidian; and gold or silver sheen obsidian, in which tiny oriented crystals of magnetite or hedenbergite create an iridescent effect resembling a metallic veil.

Then there is the extremely rare fire obsidian, one of the most valuable and sought-after varieties among collectors.

The Apache Tears discussed earlier are also a particular form: small rounded nodules that remain as intact cores within perlite, the rock into which obsidian can transform as it absorbs moisture over time.