Table 1: Peaks present in the spectra before the HF treatment.
Peak position Vibration mode Carrier Interpretation

(cm^-1)

794-780 Si-O-Si bending silicate phyllosilicate

806-800 Si-O-Si bending siloxane remaining silicone oil^a

840-837 Si-O stretching silicate olivine^a

890-880 " silicate olivine^a

955-950 Si-O stretching silicate pyroxene^a

990-970 " silicate olivine^a

1014-1010 " silicate pyroxene^a

1018 " silicate phyllosilicate^a

1070-1060 Si-O stretching silicate pyroxene^a

1095-1080 Si-O stretching siloxane remaining silicone oil^a

1260 Si-O stretching siloxane remaining silicone oil^a

1375 COO^- sym stretch organic carbox. acid salts

1415-1400 unknown

1457-1450 CO₃^- carbonate ion carbonates

1583 COO^- antisym stretch organic carbox. acid salts

1667-1660 H-O-H bending water phyllosilicate

3000-2800 CH₂; CH₃ sym and asym stretch organic aliphatic hydrocarbons^a

2963 Si-O stretching siloxane remaining silicone oil^a

3600-3100 (centered at 3400) OH stretch water water in phyllosil., carbox. acids, alcohols

$\textstyle \parbox{16.5cm}{ $^{a}$\space Unambiguous assignment.}$

**Table 1:** Peaks present in the spectra before the HF treatment.
Peak position	Vibration mode	Carrier	Interpretation
(cm^-1)
794-780	Si-O-Si bending	silicate	phyllosilicate
806-800	Si-O-Si bending	siloxane	remaining silicone oil^a
840-837	Si-O stretching	silicate	olivine^a
890-880	"	silicate	olivine^a
955-950	Si-O stretching	silicate	pyroxene^a
990-970	"	silicate	olivine^a
1014-1010	"	silicate	pyroxene^a
1018	"	silicate	phyllosilicate^a
1070-1060	Si-O stretching	silicate	pyroxene^a
1095-1080	Si-O stretching	siloxane	remaining silicone oil^a
1260	Si-O stretching	siloxane	remaining silicone oil^a
1375	COO^- sym stretch	organic	carbox. acid salts
1415-1400			unknown
1457-1450	CO₃^-	carbonate ion	carbonates
1583	COO^- antisym stretch	organic	carbox. acid salts
1667-1660	H-O-H bending	water	phyllosilicate
3000-2800	CH₂; CH₃ sym and asym stretch	organic	aliphatic hydrocarbons^a
2963	Si-O stretching	siloxane	remaining silicone oil^a
3600-3100 (centered at 3400)	OH stretch	water	water in phyllosil., carbox. acids, alcohols

Source LaTeX | All tables | In the text

	1 Introduction
	2 Materials and methods
	3 Results
	4 Discussion
	5 Conclusions and perspectives
	References