Spiderweb Obsidian and Its Web of Veins

What is spiderweb obsidian?

Spiderweb obsidian is a variety of black obsidian threaded with a network of paler veins: white, gray, beige, sometimes reddish brown. These veins branch and cross over one another, forming an irregular mesh reminiscent of a web.

Its big difference from other patterned varieties is that it's visible right away, in plain light, with no need to angle it or hold it up to the light. This is a straightforward stone that shows exactly what it is at a glance.

Each piece is unique, the web never repeats, which is exactly what collectors love about it. See where it sits among the others in my guide to obsidian varieties.

Where its web of veins comes from

Here's what makes this variety interesting: its pattern is neither an optical effect nor a deposit from its original formation. It's a healed wound.

Obsidian is glass, and like all glass it fractures. After a flow forms, it can crack for several reasons: cooling stresses, ground movement, or the slow hydration of the glass, which makes it swell slightly and crack from within.

These fractures don't stay empty. Mineral-rich water, silica, iron oxides, carbonates, flows through them over time and deposits material inside. The material filling the fracture is different from the original glass: paler, more opaque, often chalky in appearance. That's what you're seeing.

In some pieces, this goes further still: the rock has shattered into fragments that were later re-cemented together. This is called a breccia, and the web becomes an actual puzzle. These pieces are often the most striking.

A name that covers several stones

Worth flagging, since few sites do: "spiderweb" is a descriptive trade name, not a precise mineralogical category. It describes an appearance, and that appearance can result from several distinct phenomena.

• Filled fractures, the most common case: cracks filled in by a pale mineral deposit;
• Re-cemented breccia, the rock shattered into pieces, then fused back together;
• Perlitic cracking, as the glass hydrates, it cracks into concentric arcs that weather and pale over time;
• Devitrification along fractures, the glass began crystallizing along the surface of the cracks, producing paler edges.

All of these are genuine obsidians, and all are sold under the same name. Don't look for a single definition, none exists. What matters is that the pattern be natural, not the exact category behind it.

Its three look-alikes

Three stones share a similar look or name. Here's how to tell them apart.

Midnight lace obsidian

This is the most common mix-up between obsidian varieties. Yet the distinction is simple, and rests on two criteria.

The shortcut: if the pattern shows up sitting flat on a table, it's spiderweb obsidian. If you need to hold the stone up to the light, it's midnight lace obsidian.

Snowflake obsidian

Much easier to tell apart: snowflake obsidian shows round, isolated spots, cristobalite crystals formed inside the glass, not lines. No branching, no network. Dots, not strokes.

Spiderweb jasper and spiderweb turquoise

Watch for this mix-up, which involves entirely different rocks. Spiderweb jasper and spiderweb turquoise share the same descriptive label, but:

• jasper is a microcrystalline quartz, matte, opaque, harder (6.5 to 7 on the Mohs scale);
• turquoise is blue-green, with a brown or black web, the exact reverse of obsidian's color scheme;
• obsidian is glass, a glassy, almost mirror-like luster, with a mid hardness of 5 to 5.5.

The decisive clue is still the luster. A polished obsidian shines like glass. A jasper, even well polished, keeps a waxy look.

The meaning attributed to spiderweb obsidian

As with other rare varieties, let's say it up front: this is a modern trade name, with no tradition of its own. The current correspondences were formulated in recent decades, by analogy with its pattern.

That said, they hold together:

• repair and rebuilding: this is its dominant symbolism, and it follows directly from how it forms, a stone whose breaks have been filled in;
• resilience: the idea that a fracture can become a strength rather than a weakness;
• seeing connections: by analogy with the web, it's linked to understanding tangled situations;
• protection and grounding, qualities shared by all obsidians.

This is probably the variety whose symbolism lines up most closely with its actual geology. As for chakras, it's linked to the root chakra like any obsidian. The full picture is in my guide to obsidian and chakras.

How to choose and wear it

Good news compared with midnight lace obsidian: since its pattern is visible in direct light, spiderweb obsidian works perfectly as jewelry. It's actually one of the few rare varieties you get to fully enjoy while wearing it.

A few pointers for choosing well:

• Look for contrast, the finest pieces have crisp, pale veins against a deep black. A gray-on-gray pattern lacks character;
• Check the density of the web, too many veins and the stone looks messy, too few and the effect disappears;
• Check its strength, the veins are old fractures, so they're zones of weakness. A very dense web weakens the stone. In that case, avoid rings, which take the most knocks;
• Be wary of overly regular patterns, real fracturing is chaotic. A geometric network, with lines of constant thickness, can be a sign of an engraved or dyed stone.

I don't work with this variety in my studio, it remains hard to source with consistent quality. If you're after an obsidian to wear every day, classic black obsidian offers the same grounding energy without the fragility of the veins.

Mineral data sheet

Care and cleansing

One extra precaution applies here, and it's structural: since the veins are old fractures filled with a softer, sometimes porous material, they are the stone's weak point.

• Avoid long soaks, water can seep into the porous fillings;
• Cleaning, a soft, dry cloth is best. If needed, a quick rinse under clear water, then dry immediately;
• Cleansing, smudging is ideal here, since it avoids any liquid contact. Never use salt, which gets lodged in the veins;
• Recharging, moonlight, without prolonged sun exposure;
• Impacts, a veined stone tends to break along its old fracture lines. Store it alone, in a soft pouch.

Full step-by-step care is in my guides to cleaning obsidian and cleansing and recharging.

Frequently asked questions