Silver Peacock Obsidian Identification Guide

What Silver Peacock Obsidian Looks Like

Silver peacock obsidian is a trade name for sheen obsidian — natural volcanic glass that displays a silvery, multicolored peacock-like iridescence when light hits aligned layers of microscopic gas bubbles or mineral nanoparticles. The body is dark, and the sheen flashes silver with hints of blue, green, and gold as you tilt it.

• Color: black to dark gray body with a silvery, peacock-colored sheen on polished surfaces
• Luster: vitreous (glassy)
• Transparency: translucent on thin edges to opaque
• Habit: massive glass (no crystals); cut and polished to bring out the sheen

Step-by-Step Field-ID Checklist

1. Rotate under a single light. The sheen sweeps across the surface as you tilt it — caused by reflection off aligned internal layers, not surface coating.
2. Confirm glassy fracture. Fresh breaks are smooth, curved (conchoidal), and razor-sharp — the hallmark of obsidian.
3. Test hardness. It scratches glass with difficulty and a knife may barely mark it (about 5–5.5).
4. Look at thin edges. Many obsidians transmit light at the edge, confirming glass rather than opaque rock.
5. Heft and warmth. Glass feels moderate in weight and is cool but not as cold-dense as metallic minerals.

Key Diagnostic Tests

• Mohs hardness: about 5–5.5.
• Streak: white.
• Cleavage/fracture: none; conchoidal fracture with sharp edges.
• Specific gravity: about 2.35–2.6 (lighter than most crystalline dark minerals).
• Acid: no reaction.
• Optical clue: the sheen is internal and directional (visible only at certain tilt angles).

Common Look-Alikes and How to Tell Them Apart

• Rainbow obsidian: shows concentric ringed bands of color; silver/peacock sheen obsidian shows a single sweeping silvery sheen across the whole surface rather than rings.
• Gold/silver sheen obsidian: these are the same family; "silver peacock" implies a multicolored silvery flash, while plain silver sheen is monochrome silver and gold sheen is golden.
• Labradorite: labradorite also flashes color (labradorescence) but is a crystalline feldspar with cleavage and hardness 6–6.5; obsidian has no cleavage and conchoidal fracture.
• Black tourmaline/onyx: these lack the directional sheen; tourmaline is harder (7) and crystalline, onyx is banded chalcedony (7).
• Manufactured goldstone/glass: man-made glass may show bubbles and uniform sparkle rather than a single sheet of aligned sheen, and slag glass lacks natural conchoidal context.

The combination of glassy conchoidal fracture + hardness ~5–5.5 + a directional silvery peacock sheen + no cleavage identifies it.

Where Silver Peacock Obsidian Is Found

Sheen obsidian forms in silica-rich (rhyolitic) lava that cools too fast to crystallize, with aligned bubble or nanoparticle layers producing the sheen. Major obsidian sources include Mexico (a leading source of sheen and rainbow material), the western United States (Oregon, California, Idaho, Arizona, New Mexico), Iceland, and other young volcanic regions.