| 释义 |
villiaumite Min.|ˈvɪlɪəmaɪt|
[a. F. villiaumite (A. Lacroix 1908, in Compt. Rend. CXLVI. 215), f. Villiaume, name of a French explorer in whose collection the mineral was first identified: see -ite1.]
Native sodium fluoride, NaF, occurring as red, pink, or orange transparent isometric crystals.
The symmetry is erron. described in quot. 1908.
1908Jrnl. Chem. Soc. XCIV. ii. 201 This new mineral, called villiaumite, is tetragonal and pseudo-cubic, with three perfect cleavages at right angles to one another. 1970Amer. Mineralogist LV. 126 Thermodynamic calculations show that fluorite is to be expected as the common fluoride mineral in both silica-saturated and under⁓saturated igneous rocks; in calcium- and silica-poor assemblages villiaumite is favored, but in calcium-poor quartz-bearing rocks, cryolite will prevail. |