Infrared and Raman spectroscopic characterization of the silicate mineral olmiite CaMn2+[SiO3(OH)](OH) – implications for the molecular structure

Frost, Ray L. and Scholz, Ricardo and Lopez, Andres and Xi, Yunfei and Granja, Amanda and Žigovečki Gobac, Željka and Fernandez Lima, Rosa Malena (2013) Infrared and Raman spectroscopic characterization of the silicate mineral olmiite CaMn2+[SiO3(OH)](OH) – implications for the molecular structure. Journal of Molecular Structure, 1053. pp. 22-26.

[img] PDF
Restricted to Registered users only
Language: English

Download (1MB)

Abstract

We have studied the mineral olmiite CaMn[SiO3(OH)](OH) which forms a series with its calcium analogue poldervaartite CaCa[SiO3(OH)](OH) using a range of techniques including scanning electron microscopy, thermogravimetric analysis, Raman and infrared spectroscopy. Chemical analysis shows the mineral is pure and contains only calcium and manganese in the formula. Thermogravimetric analysis proves the mineral decomposes at 502 �C with a mass loss of 8.8% compared with the theoretical mass loss of 8.737%. A strong Raman band at 853 cm�1 is assigned to the SiO stretching vibration of the SiO3(OH) units. Two Raman bands at 914 and 953 cm�1 are attributed to the antisymmetric vibrations. Two intense Raman bands observed at 3511 and 3550 cm�1 are assigned to the OH stretching vibration of the SiO3(OH) units. The observation of multiple OH bands supports the concept of the non-equivalence of the OH units. Vibrational spectroscopy enables a detailed assessment of the molecular structure of olmiite.

Item Type: Article
Keywords: Olmiite, Phosphate, Raman spectroscopy, Infrared spectroscopy
Date: 2013
Subjects: NATURAL SCIENCES > Geology > Mineralogy and Petrology
Divisions: Faculty of Science > Department of Geology
Depositing User: Danica Vujičić
Date Deposited: 02 Jul 2015 09:56
Last Modified: 02 Jul 2015 09:56
URI: http://digre.pmf.unizg.hr/id/eprint/3676

Actions (login required)

View Item View Item