This specimen is majority Stibnite and contains Calcite (CaCO3).

Five intersecting lustrous, gray-metallic Stibnite blade crystals with lustrous, transparent, pale-yellow Calcite crystals. During crystallization, it was broken and rehealed three times. Crystals are metallic, sharp, and lustrous. Xikuangshan Sb deposit, Lengshuijang Co., Loudi Prefecture, Hunan Province, China. 7.5 x 3 cm.