ce·les·tite /ˈsɛləsˌtaɪt, səˈlɛsˌtaɪt/
天青石
Cel·es·tine Cel·es·tite, n. Min. Native strontium sulphate, a mineral so named from its occasional delicate blue color. It occurs crystallized, also in compact massive and fibrous forms.
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celestite
n : a mineral consisting of strontium sulphate