Spiderweb Obsidian and Its Network of Veins

What is spiderweb obsidian?

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

Its big difference from other patterned varieties is that it shows immediately, in plain light, with no need to angle it or hold it to a backlight. It's a straightforward stone, revealing itself at once.

Every piece is unique, the network never repeats, which is exactly what appeals to collectors. You'll find it alongside the others in my guide to obsidian varieties.

Where does its network of veins come from?

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

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

These cracks don't stay empty. Water carrying minerals, silica, iron oxides, carbonates, circulates through them and deposits over time. The material filling the fracture is different from the original glass: paler, more opaque, often chalky in appearance. That's what you see.

In some pieces, the process goes further: the rock shattered into fragments that were later re-cemented together. This is called a breccia, and the network becomes a genuine 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 come from several distinct processes.

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

All of these are genuine obsidians, and all are sold under the same name. So don't go looking for a single definition: none exists. What matters is that the pattern is natural, not the exact category.

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 obsidians. The distinction, though, is simple and comes down to two criteria.

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

Snowflake obsidian

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

Spiderweb jasper and 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 network, the exact reverse of obsidian's colour scheme;
• obsidian is a glass, vitreous, almost mirror-like lustre, medium hardness of 5 to 5.5.

The decisive marker remains lustre. Polished obsidian shines like glass. Jasper, even well polished, keeps a waxy look.

The properties credited to spiderweb obsidian

As with the other rare varieties, worth saying upfront: this is a modern trade name, with no ancient 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: its dominant symbolism, following directly from how it forms, a stone whose breaks have been healed;
• resilience: the idea that a fracture can become a strength rather than a weakness;
• seeing connections: by analogy with the network, it's associated with understanding tangled situations;
• protection and grounding, qualities shared by every obsidian.

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

How to choose and wear it

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

A few pointers for choosing well:

• Look for contrast, the best pieces have crisp, pale veins against a truly black ground. A grey-on-grey pattern lacks character;
• Check the density of the network, too many veins and the stone looks messy, too few and the effect disappears;
• Check its strength, the veins are old fractures, meaning weak points. A very dense network weakens the stone. Avoid rings, which take the most knocks;
• Be wary of overly regular patterns, genuine fracturing is chaotic. A geometric network with consistently even lines can point to an engraved or dyed stone.

I don't work with this variety in the studio, it remains hard to source at a 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're the stone's weak point.

• Avoid prolonged soaking, water can seep into the porous infill;
• Cleaning, a soft, dry cloth is best. If needed, a quick rinse in clear water, dried immediately;
• Cleansing, smoke cleansing is ideal here, since it avoids any liquid contact. Never use salt, which lodges in the veins;
• Charging, moonlight, without prolonged sun exposure;
• Knocks, a veined stone breaks along its old fractures. Store it alone, in a soft pouch.

The full run-down is in my guides to cleansing and charging obsidian.

Frequently asked questions