Halide minerals

Table
Halide minerals
name colour lustre Mohs hardness specific gravity
atacamite various bright green shades; dark emerald-green to blackish adamantine 3–3½ 3.8
calomel colourless, white, grayish, yellowish, brown adamantine 1½ 7.15
carnallite milk-white; sometimes reddish (from included hematite) greasy, dull to shining 2½ 1.6
cerargyrite colourless when pure and fresh; usually gray; becomes purple or violet-brown on exposure to light (cerargyrite) hornlike 2½ 5.6 (AgCl) to 6.5 (AgBr)
cryolite colourless to white, brownish, reddish, brick red vitreous to greasy 2½ 3.0
fluorite variable vitreous 4 3.2
halite colourless when pure, often splotched blue or purple vitreous 2 2.2
sal ammoniac colourless, white, grayish, yellow vitreous 1–2 1.5
sylvite colourless, white, grayish, bluish, or red (from included hematite) vitreous 2 2.0
name habit or form fracture or cleavage refractive indices crystal system
atacamite brittle, transparent to translucent tabular to slender prismatic crystals one perfect cleavage alpha = 1.831
beta = 1.861
gamma = 1.880 orthorhombic
calomel tabular crystals; drusy crusts; earthy masses one good cleavage omega = 1.956–1.991
epsilon = 2.601–2.713 tetragonal
carnallite granular, massive conchoidal fracture alpha = 1.465–1.466
beta = 1.474–1.455
gamma = 1.444–1.446 orthorhombic
cerargyrite crusts; waxy coatings; hornlike masses uneven to subconchoidal fracture n = 2.071–2.253 isometric
cryolite coarsely granular masses no cleavage alpha = 1.338
beta = 1.338
gamma = 1.339 monoclinic
fluorite brittle, transparent or translucent cubes and two-cube penetration twins perfect octahedral cleavage n = 1.432–1.437 isometric
halite transparent cubic (often cavernous or stepped) crystals; granular masses perfect cubic cleavage n = 1.544 isometric
sal ammoniac skeletal aggregates conchoidal fracture n = 1.639 isometric
sylvite transparent cubes or granular masses perfect cubic cleavage n = 1.490 isometric
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Universalium. 2010.

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