[Chemical composition] The composition is relatively pure, and contains a trace amount of elements such as Fe, S, Te, As, and Sb.
[Crystal Structure] Trigonal System; 
a rh = 0.475 nm, α = 57 ° 14', Z = 2; a h = 0.456 nm, c h = 1.187 nm, Z = 8. Arsenic structure (Figure Z-12).
FIG Z-12 crystal structure of natural bismuth (arsenic type structure)
(quoted from Chen Wu, Ji Shouyuan, 1985)
(a) NaCl-type structure, (b) arsenic structure formed by deformation of the NaCl-type structure in the L 3 direction
[Form] Single crystals are rare, and are usually in the form of granules, flakes, dense blocks or feathers.
[Physical properties] Fresh microstrip section was pale yellow silver, Qiang color with easily become reddish in air; gray streaks; metallic luster. {0001} Completely cleavage. Hardness 2 to 2.5. The relative density is 9.70~9.83; it has weak ductility; the melting point is 271 °C. With reverse magnetism.
[genesis and occurrence] Natural strontium can be formed in high temperature hydrothermal deposits and pegmatite deposits. Natural cockroaches are easily oxidized under surface conditions to form strontium and strontium ore.
[identification characteristics] light red ochre, complete cleavage, low hardness and relatively high density.
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