Fluorite

CaF₂

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The reference mineral for hardness 4 on the Mohs scale, fluorite is a calcium fluoride (CaF2) celebrated for its wide spectrum of colors, whether purple, blue, green, yellow, pink, or colorless. It crystallizes in the cubic system, most often as cubes or octahedra, with a vitreous luster, a white streak, and perfect octahedral cleavage. Its specific gravity ranges from 3.13 to 3.18. Many specimens glow strongly under ultraviolet light, and the phenomenon of fluorescence was in fact named after this mineral. Fluorite serves as a flux in metallurgy and as a source of fluorine compounds. A specific gravity near 3.15 and only moderate hardness set it apart from the harder, denser minerals it accompanies in veins.

氟化钙矿物，呈多种颜色且常有萤光。用于冶金、光学和光谱学应用。

晶系	Cubic (Isometric)
矿物分类	03 Halides
莫氏硬度	4.0
比重	3.13-3.18
颜色	Purple, blue, green, yellow, colorless, pink
光泽	Vitreous
条痕色	White
解理	Perfect octahedral {111}
断口	Conchoidal
透明度	Transparent
晶体习性	Cubic, octahedral