Structural Interpretation of Lunar and Terrestrial Minerals by Raman Spectroscopy

Polarized IR and Raman spectra of Ca2MgSi2O7, Ca2ZnSi2O7 and Sr2MgSi2O7 single crystals: Temperature-dependent studies of commensurate to incommensurate and incommensurate to normal phase transitions

“…[22][23][24][25][26]. Thus, in analogy with pyrophosphate group, the 21 internal modes of free Si 2 O 7 can be subdivided into: symmetric and asymmetric stretching modes of the SiO 3 groups [n s SiO 3 (A 1 þB 1 ) and n as SiO 3 (A 1 þB 1 þB 2 þA 2 ), respectively]; symmetric stretching (n s Si O Si-A 1 ), asymmetric stretching (n as Si O Si-B 1 ) and bending (dSi O Si-A 1 ) modes of the Si O Si bridge; rocking modes of SiO 3 group [tSiO 3 (A 2 þB 2 )] and bending modes of the SiO 3 groups [dOSiO (3A 1 þ2A 2 þ3B 1 þ2B 2 )] [26][27][28][29][30][31]. In the crystal these modes will give rise to 7A 1 þ 4A 2 þ 4B 1 þ7B 2 þ 10E internal modes (see the correlation diagram presented in Table 2).…”

A Raman microprobe study of natural micas

“…These peaks involve tetrahedral sites, as also in the case of the peak occurring at ~ 1040 cm -1 (e.g. 1028 in phlogopite; 1058 in muscovite), by analogy with the Raman spectra of pyroxenes (White, 1975;Ohashi andSekita, 1982, 1983;Sharma et al, 1983;Smith and Boyer, 1985) and the Raman spectra of amphiboles (White, 1975;. The peak at 702 cm -1 in muscovite and at 679 cm -1 in phlogopite is thus assigned to Si-O-Si vibrations.…”

“…In margarite, the tetrahedral distortion results in coordination 6 for the Ca atoms, with a distinct shifting along the cleavage plane of the opposing pseudo-hexagonal tetrahedral patterns. For further details the reader is referred to review articles by Zussman (1979), Bailey (1984a andb), andGuggen heim (1984) and the many references cited therein.…”

“…Boyer and Smith, 1984;Boyer et al, 1985a), amphiboles (e.g. White, 1975;, titanates including titanite (Boyer et al, 1985b) and geikielite-ilmenite-pyrophanite (Pinet et al, 1987) or silicates in general (e.g. Griffith, 1975).…”

Shock-metamorphic features in amphiboles from the Xiuyan crater of China

“…4a, 5a). The Raman peak at 667 cm -1 is assigned to the bending modes of the Si-O-Si bridges, whereas the peak at 223 cm -1 is assigned to a lattice vibration (White 1975;Shurvell et al 2001;Huang 2002). The Raman peak between 1,000-1,150 cm -1 is characteristic of the (Table 2).…”