Brief introduction of lapis lazuli minerals
The Aojingshan lapis lazuli deposit in Fuyang, Jiangsu, China is the largest antimony deposit in Asia.
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Mineral name: lapis lazuli;
Chemical composition: SrSO4, strontium-containing ore [1]; composition Sr (SO4), containing Sr45% ~ 47%, sometimes containing barium and calcium. [2]; (Sr, Ba) SO4. The Sr content is greater than Ba, and may contain elements such as Pb, Ca, and Fe.
Crystal system: orthorhombic system
Crystal habit: plate or column and plate crystal, orthorhombic double cone crystal, plate crystal. Incomplete crystals are rare, mostly aggregates, in the form of stalactites, tuberculosis, fibrous, fine-grained
Color: blue, green, yellow-green, orange or colorless; light blue-gray, sometimes colorless and transparent.
Gloss and transparency: glass luster, cleavage surface is pearl luster, transparent to translucent
Photometric: biaxial crystal, positive light
Refractive index: 1.619~1.637; birefringence 0.018
Polychromaticity: weak
Absorption spectrum: not obvious
Cleavage: The cleavage parallel bottom surface {001} is complete, the two groups are completely cleavage, and the parallel oblique column {210} is medium.
Mohs hardness: 3.0~3.5
Density: 3.97~4.0g/cm^3
Output: Mainly produced in sedimentary rocks such as dolomite, limestone, marl and gypsum clay. Produced in hydrothermal deposits and sedimentary deposits.
Uses: Used to extract bismuth and prepare bismuth compounds [3], make screens for picture tubes, red fireworks and signal flares.
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