Quick Facts
Formation & Origin
Stibnite crystallizes from low-temperature hydrothermal solutions, typically between 100-300°C. It forms in veins associated with hot springs and volcanic activity, often alongside quartz, calcite, and other sulfide minerals.
The crystals grow in elongated prismatic habits that can reach remarkable sizes. The famous Ichinokawa Mine in Japan produced sword-like crystals exceeding half a meter in length. These dramatic formations develop when antimony-rich fluids flow through fractures in the host rock and conditions remain stable long enough for slow, uninterrupted crystal growth.
Stibnite is the primary ore of antimony, a metalloid used in flame retardants, lead-acid batteries, and alloys. Ancient civilizations ground stibnite into powder for use as kohl eyeliner, a practice dating back to ancient Egypt and Mesopotamia.
Identification Guide
Stibnite's long, striated prismatic crystals with brilliant metallic luster make it one of the most visually distinctive minerals. The crystals are often bent or curved, a result of the mineral's extreme softness (Mohs 2) and perfect cleavage in one direction. You can scratch it with a fingernail.
Distinguish from galena (cubic crystals, higher hardness), bismuthinite (very similar but rarer and slightly harder), and metallic tourmaline (much harder, different crystal habit). Stibnite will melt in a match flame, which is a reliable but destructive test.
Spotting Fakes
Stibnite is rarely faked because it's relatively affordable and abundant. The main concern is damage from cleaning. Many Chinese specimens are cleaned with acids that can leave surfaces dull or pitted. The best specimens retain their natural metallic brilliance. Avoid specimens that look unnaturally uniform or suspiciously shiny, as they may have been coated.
Cultural & Metaphysical Traditions
Presented as cultural traditions, not scientific evidence
Crystal practitioners associate stibnite with transformation and the ability to navigate dark or uncertain periods. Its sword-like crystal habit has made it a symbol of cutting through illusion. Some traditions use it for meditation on shadow work. Handle with care and wash hands after, as stibnite contains antimony.
Where It's Found
Legendary specimens with blade-like crystals up to 60cm
Major modern source, excellent crystal clusters
Classic European locality with fine crystals
Historic American specimens
Price Guide
Good to Know
Scratch test: At hardness 2, Stibnite can be scratched with a fingernail. This is a display specimen, not a wearable stone.
Sources: Found in 4 notable locations worldwide, from Japan to United States.
Heft test: Stibnite has a specific gravity of 4.63 - noticeably heavier than quartz. You'll feel the density when you pick it up.
Related Minerals
Similar metallic sulfide, lead instead of antimony
Antimony replaced by bismuth, same structure
Fellow metallic sulfide, different crystal system