白雲母

{{Infobox mineral
| name = 白雲母
| category = 頁矽酸鹽礦物
雲母族
| boxwidth =
| boxbgcolor =
| image = Muscovite-Albite-122887.jpg
| imagesize =
| caption = 含有長石的白雲母。採集於巴西米纳斯吉拉斯洲 的達克山脈。尺寸：6×5.3×3.9厘米
| formula = KAl2(AlSi3O10)(F,OH)2
| IMAsymbol = Ms
| strunz = 09.EC.15
| dana = 71.02.02a.01
| symmetry = C2/c
| unit cell = a = 5.199 Å, b = 9.027 Å, c = 20.106 Å, β = 95.78°; Z = 4
| molweight =
| color = 白、灰或銀
| habit = 巨大的板狀
| system = 單斜晶系 (2/m)
| twinning = 常見於[310] 不常見於{001}
| cleavage = {001}完美
| fracture = Micaceous
| tenacity = Elastic
| mohs = 2–2.5 parallel to {001}
4 right angle to {001}
| luster = 玻璃、珍珠光澤
| polish =
| refractive = nα = 1.552–1.576
nβ = 1.582–1.615
nγ = 1.587–1.618
| opticalprop = 雙軸 (-)
| birefringence = δ = 0.035 – 0.042
| dispersion = r > v weak
| pleochroism = 上色後弱
| fluorescence= 無
| absorption =
| streak = 白
| gravity = 2.76–3
| density =
| melt =
| fusibility =
| diagnostic =
| solubility =
| diaphaneity = 透明至半透明
| other =
| references =
| var1 = 鉻雲母 | var1text = 富含鉻的白雲母，顏色呈綠色
}}

白雲母(）為矽酸鹽礦物的一種。化學式為KAl2(AlSi3O10)(OH)2，晶體結構為單斜晶系。它具有各向異性，可產生強雙折射現象。

白雲母是最常見的雲母，可見於花崗岩、偉晶岩、片麻岩和片岩中。

參考資料