钙矾石

{{Infobox mineral|name=钙矾石|image=Ettringite-290218.jpg|caption=钙矾石，3.3×2.6×2.5 cm。产自南非北开普省卡拉哈里锰田。|category=硫酸盐矿物|formula=Ca6Al2(SO4)3(OH)12·26H2O|strunz=7.DG.15|symmetry=P31c|unit cell=a = 11.23, c = 21.44 [Å]; Z = 2|color=无色、淡黄色、乳白色|habit=Acicular growth, striated prismatic crystals; fibrous to cottonlike|system=三方晶系|cleavage=Perfect on {100}|mohs=2-2.5|luster=Vitreous|opticalprop=Uniaxial (-)|refractive=nω = 1.491, nε = 1.470|birefringence=δ = 0.021|fluorescence=Non-fluorescent|streak=White|gravity=1.77|solubility=Partially soluble in water|diaphaneity=Transparent to opaque|alteration=Partially dehydration on atmospheric exposure, becomes opaque|references=}}

钙矾石是一种含水的钙铝硫酸盐矿物，其化学式为·。它呈无色到黄色，晶系为三方晶系。其柱状晶体通常情况下无色，部分脱水后显白色。钙矾石类矿物包括矽灰石膏和鈣鉻礬。

发现和生成
参考文献