This kind of gem has never been seen in the market, and I can give you very little information. Baidu Encyclopedia has its chemical analysis. In addition, the answer of "fallen druid" extracted by the landlord also illustrates this point. It's really hard to get.

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Baidu Encyclopedia related information:

The chemical formula of celestite is SrSO4, which is the most important strontium-containing mineral in nature. The theoretical chemical composition of celestite is SrO56.4% and SO343.6%, but sometimes Sr in celestite is partially replaced by Ca or Ba, resulting in isomorphic calcium celestite or barium celestite.

Celestite is an orthorhombic crystal system, and its single crystal is often plate-like or columnar, and its aggregate is granular, fibrous and nodular. Pure celestite crystal is light blue or sky blue, so it is called celestite, sometimes colorless and transparent, and black when mixed with impurities. Lapis lazuli is glass luster, with pearl-like halo and white stripes on cleavage surface, which is fragile and Mohs hardness is 3~3.5. The density is 3.97~4.0g/cm3.