mineral

Radiating stibnite crystals

Stibnite (antimony sulfide, Sb₂S₃)

AI-generated identification · may be incorrect

Metallic lead-gray to black, commonly radiating or bladed crystals with prominent longitudinal striations; Mohs hardness 2, perfect cleavage, orthorhombic crystal system, and high specific gravity (~4.6). The specimen appears partly weathered or coated, with a brown matrix/alteration surface.

Identified September 20, 2026More mineral →

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Physical properties

Formation & geological history

Forms in low-temperature hydrothermal veins and replacement deposits, often with quartz, calcite, or other sulfides; its age depends on the host deposit and may range from Paleozoic to recent hydrothermal systems.

Uses & applications

The principal ore of antimony, used in flame retardants, alloys, batteries, and specialized industrial materials; attractive crystal groups are collected but are generally too soft for jewelry.

Geological facts

Stibnite’s dramatic swordlike crystal clusters are among the most recognizable sulfide specimens. Antimony compounds can be toxic, so avoid generating dust and wash hands after handling.

Field identification & locations

Identify it by the exceptionally heavy feel, metallic gray color, softness, striated blades, and radiating aggregates; major localities include Xikuangshan, China, Japan, Romania, Bolivia, and Nevada. A definitive identification requires streak, density, and ideally laboratory analysis because galena and other sulfides can look similar.