A vibrational spectroscopic study of the silicate mineral lomonosovite Na₅Ti₂(Si₂O₇)(PO₄)O₂.

The mineral lomonosovite has been studied using a combination of scanning electron microscopy with energy dispersive X-ray analysis and vibrational spectroscopy. Qualitative chemical analysis gave Si, P, Na and Ti as the as major elements with small amounts of Mn, Ca, Fe and Al. The mineral lomonosovite has a formula Na₅Ti₂(Si₂O₇)(PO₄)O₂.

A vibrational spectroscopic study of the borate mineral takedaite Ca3(BO3)2.

We have studied the mineral takedaite Ca3(BO3)2, a borate mineral of calcium using SEM with EDX and vibrational spectroscopy. Chemical analysis shows a homogeneous phase, composed of Ca. Boron was not detected.

Vibrational spectroscopic characterization of the sulphate mineral leightonite K2Ca2Cu(SO4)4·2H2O--implications for the molecular structure.

The mineral leightonite, a rare sulphate mineral of formula K2Ca2Cu(SO4)4·2H2O, has been studied using a combination of electron probe and vibrational spectroscopy. The mineral is characterized by an intense Raman band at 991 cm(-1) attributed to the SO4(2-) ν1 symmetric stretching mode. A series of Raman bands at 1047, 1120, 1137, 1163 and 1177 cm(-1) assigned to the SO4(2-) ν3 antisymmetric stretching modes.