Specimens Stibnite is a classic mineral species with fine crystal clusters and long curved crystals being the pride of many collectors. The slender curved metallic blades of stibnite can resemble arabian swords. The curving of the long bladed crystals is due to twinning where one twin plane bends the crystal one direction and another twin plane bends it in the other direction. This can occur numerous times down the length of one crystal. Stibnite's crystal clusters are admired for their distinctive look with dozens of accicular or bladed crystals jutting out in many divergent directions.
Color is steel gray to silver.
Luster is metallic. Transparency crystals are opaque. Crystal Habits include bladed or acicular crystals often bent or curved due to twinning, also granular and massive. Cleavage is perfect in the lengthwise direction. Fracture is irregular.