Brilliant ore (Stibnite or Antimonite)
[Chemical composition] The composition is relatively fixed, containing a small amount of As, Pb, Ag, Cu and Fe, and most of the elements are mechanically mixed.
[crystal structure] orthorhombic system 
a 0 =1.120 nm, b 0 =1.128 nm, c 0 =0.383 nm; Z=4. 
Figure L-12 Crystal structure of stibnite
(quoted from Pan Zhaoyu et al., 1993)
The crystal structure has a chain structure (Fig. L-12), and the chain is closely connected by S and Sb, and these chains are parallel to the c-axis. The distance between S and Sb in the chain is about 0.32 nm. The bond force is weak, so that the symmetry is shown along this direction {010}, and the crystal form extends along the direction of the chain in the structure, and is columnar parallel to the c-axis.
Figure L-13 stibnite crystal
(quoted from Pan Zhaoyu et al., 1993)
 oblique square column: m{110}, n{210}; parallel double-sided: b010}; oblique square double cone: s{111}, p{331}, t{341}
[Form] The single crystal is columnar or needle-shaped, and the cylinder has obvious longitudinal stripes (Fig. L-13). Larger crystals tend to show curvature. The aggregates are often radial or densely granulated (Figure L-14).
Figure L-14 stibnite cluster
[Physical properties] steel gray or gray lead, surface often blue Qiang color; black streak; crystals often with dark blue Qiang color; metallic luster; opaque. Cleavage parallel {010} complete. The cleavage plane often has a horizontal polycrystalline double crystal grain. Hardness 2. The relative density is 4.6. Crisp.
[genesis and production] is mainly produced in low-temperature hydrothermal deposits, and is symbiotic with cinnabar, quartz , fluorite , barite and calcite .
China's Hunan Xinhua tin mine is the world's most famous and largest source of stibnite.
[Identification features] lead gray, columnar crystal form, longitudinal stripes on the cylinder surface (poly-grain), horizontal stripes on the cleavage surface (polycrystalline twin crystal). For the fine-grained block, the KOH is dropped thereon, and immediately appears yellow, and then turns into an orange-red color, thereby distinguishing it from a similar stibnite .
[Main use] It is an important ore mineral of bismuth. The crystals are large or beautiful and can be highly ornamental and collectible.
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