Apache Tears Identification Guide

What Apache Tears Look Like

Apache tears are small, rounded nodules of obsidian (natural volcanic glass) that weather out of gray perlite. Unlike sheet obsidian, which is jet-black and opaque in chunks, Apache tears are translucent when held to a light, glowing smoky brown, gray, or near-black at the edges. They are typically pebble-sized, with a smooth to pitted surface from being freed from their chalky perlite host.

• Color: black, smoky gray, or brown; translucent reddish-brown to gray when backlit
• Luster: vitreous (glassy), greasy on weathered surfaces
• Transparency: translucent to nearly transparent on thin edges
• Form: rounded nodules and pebbles, not crystals
• Matrix clue: often found embedded in or alongside soft, white-gray perlite

Step-by-Step Field ID Checklist

1. Backlight the stone: shine a flashlight through it; Apache tears glow translucent smoky brown or gray, while ordinary obsidian chunks look solid black.
2. Look at the shape: naturally rounded nodules rather than sharp flakes suggest Apache tears weathered from perlite.
3. Check the surface: a glassy or slightly frosted, dimpled exterior is typical.
4. Chip an edge (carefully): glassy conchoidal fracture with razor-sharp edges confirms volcanic glass.
5. Note the matrix: if surrounded by light, popcorn-like gray perlite, that is the classic Apache tears setting.

Key Diagnostic Tests

• Mohs hardness: about 5 to 5.5; scratches glass faintly, scratched by quartz and steel files
• Streak: white
• Cleavage: none; conchoidal fracture is diagnostic of glass
• Specific gravity: about 2.3 to 2.5, light in the hand
• No reaction to acid; not magnetic
• Translucency test: the single most useful field test; true Apache tears transmit light

Common Look-Alikes and How to Tell Them Apart

• Black obsidian (sheet/chunk): same material but Apache tears are smaller, rounded, and translucent; large opaque black blocks are simply obsidian.
• Smoky quartz: harder (7), scratches glass easily, often shows crystal faces; Apache tears are softer glass with no crystal form.
• Black tourmaline (schorl): harder, occurs as striated prismatic crystals, opaque; not glassy nodules.
• Hematite/black chalcedony pebbles: hematite is heavy with a red streak; black chalcedony is harder (7) and waxier and does not transmit the smoky glow.
• Jet/anthracite: these are organic, soft, and burn or scratch easily; Apache tears are inorganic glass that scratches glass.

Where Apache Tears Are Typically Found

Apache tears weather from perlite deposits in the volcanic regions of the American Southwest, most famously around Superior, Arizona (Apache Leap), and also in Nevada, New Mexico, California, and parts of Mexico. Search gray perlite gravels and washes below volcanic flows, where the rounded glass nodules wash free of their softer matrix.