氟铝石膏

{{Infobox mineral
| name = 氟铝石膏
| category = 卤化物矿物
| boxwidth =
| boxbgcolor =
| image = Creedite 3 photo fond.jpg
| imagesize =
| caption = 氟铝石膏，來自墨西哥奇瓦瓦州圣欧拉利亚区Aquiles Serdán
| formula = Ca3Al2(SO4)(F,OH)10•2H2O
| IMAsymbol=Cee
| molweight =
| strunz = 3.CG.15
| system = 单斜
| class = 棱柱形 (2/m)
（H-M记号相同）
| symmetry = C2/c
| unit cell = a = 13.91 Å, b = 8.58 Å,
c = 10 Å; β = 94.4°; Z = 4
| color = 无色、白色、紫色、橙色
| habit = 在基质中一般表现为他形体至半形体；齿片状棱柱和放射状，丛状到粒状聚集体
| cleavage = {100}完美
| mohs = 3.5 - 4
| luster = 玻璃
| streak = 白色
| density =
| fracture = 贝壳状
| tenacity = 脆
| opticalprop = 双轴 (-)
| refractive = nα = 1.461 nβ = 1.478 nγ = 1.485
| birefringence = δ = 0.024
| dispersion = r > v 强
| pleochroism =
| 2V = 65°
| fluorescence=
| absorption =
| gravity = 2.71
| fusibility =
| diagnostic =
| diaphaneity = 透明到半透明
| other =
| references =
}}

氟铝石膏（）是一种钙铝氟硫酸盐矿物，化学式为Ca3Al2SO4(F,OH)10·2H2O。氟铝石膏为无色至白色或紫色单斜柱状晶体。通常为放射状棱镜，呈透明至半透明，折射率为nα = 1.461 nβ = 1.478 nγ = 1.485。莫氏硬度为3.5至4，密度为2.7。

分布
晴隆县晴隆锑金矿床的氟铝石膏。（尺寸：3.4 x 3.0 x 1.3 厘米）]]
氟铝石膏是一种稀有的卤化物矿物。通常在萤石矿床氧化形成。氟铝石膏最初于1916年在美国科罗拉多州米纳勒尔县克里德（Creede Quadrangle）被发现，也因此地而得名。

后来它在其他地区也被发现，如内华达州奈县托诺帕萤石脉矿，亚利桑那州格雷厄姆县大礁地矿，加利福尼亚州因约县达尔文区。在墨西哥奇瓦瓦州圣欧拉利亚（Santa Eulalia）的波托西和其他矿区也发现氟铝石膏。在玻利维亚的拉巴斯、塔吉克斯坦的帕米尔山脉以及哈萨克斯坦的杰兹卡兹甘均有分布。

参考资料
拓展閱讀
*Kiselva, I. A.; Ogorodova, L.P.; Mel'Chalkova, L.V.; Getmanskaya, T.I., Enthalpy of Formation of Creedite Ca3Al2F8.25(OH) (1.75)(SO4) Center dot 2H(2) O, Geochemistry International, pp. 1026–1030, OCT 2002.
*Frau, F.; Rizzo, R.; Sabelli, C., Creedite from Sardinia, Italy: the first European Occurrence, Neues Jahrbuch Fur Mineralogie-Monashefte, pp. 495–504, NOV 1998.
Giuseppetti, G; Tadini, C., Structure Analysis and refinement of Bolivian Creedite, Ca3Al2F8(OH)2(SO4)2(H2O), Neues Jahrbuch Fur Mineralogie-Monashefte, pp. 69–78, 1983.
*Fleischer, M, Probable Identity of Belyankite With Creedite, U.S. Geological Survey, , 1992.
*K, Robert B., Creedite: Cresson Mine, Cripple Creek Teller County, Colorado. Rocks & Minerals, pp422–427, OCT 2008.
*Foshag, W. F., (1932) Creedite from Nevada: Am. Mineral., 17, 75–77.

外部链接
*[https://web.archive.org/web/20051105220014/http://mineral.galleries.com/minerals/sulfates/creedite/creedite.htm Mineral galleries]