| 释义 |
nasonite Min.|ˈneɪsənaɪt|
[f. the name of Frank Lewis Nason (1856–1928), U.S. geologist + -ite1.]
A silicate and chloride of calcium and lead, Ca4Pb6(Si2O7)3Cl2, which forms hexagonal crystals and is found as white or grey granular masses.
1899Penfield & Warren in Amer. Jrnl. Sci. clviii. 346 Hand specimens usually present a mottled or spotted appearance owing to numerous inclusions of yellow axinite and brown garnet, which are scattered rather uniformly through the massive nasonite. 1935Prof. Papers U.S. Geol. Survey No. 180. 93/2 Nasonite commonly forms the matrix of glaucochroite crystals, and in the few specimens seen is also associated with garnet, axinite, and barite. 1971Amer. Mineralogist LVI. 1177 If one imagines two unit cells of apatite superposed in the c direction..and rotates one of them of 60° around the 63 axis, one obtains the unit cell of nasonite. |
