mineralRef: Reference spectra for clay minerals and iron oxides

In AlexandreWadoux/soilspec: The soilspec R package

Description

Specific mineral compounds measured by laboratory spectrometers, from Kokaly et al., (2017). A data frame with 2151 rows and 13 columns:

• wavelength: wavelength (in nm) of the reference spectra.

• goethite: reference spectrum for goethite.

• hematite: reference spectrum for hematite.

• gypsum: reference spectrum for gypsum.

• calcite: reference spectrum for calcite.

• kaolinite: reference spectra for kaolinite. Two spectra are provided: kaolinite_114 and kaolinite_113.

• montmorillonite: reference spectra for montmorillonite. Two spectra are provided: montmorillinite_126 and montmorillinite_127.

• illite: reference spectra for illite. Two spectra are provided: illite_121 and illite_120.

• kaolinite/smectite: : reference spectra for the mixture kaolinite/smectite. Two spectra are provided: kaol_smect_124 and kaol_smect_125.

Usage

data('mineralRef')

Details

The reference spectra are freely available by the USGS through their website. The minerals are purified material so that each reference spectra contain unique spectro-chemical links related to chemical structure of the mineral. The collected reference spectra are for clay minerals including kaolinite (KGa-2), illite (GDS4),smectite (SWy-1), kaolinite-smectite 50/50 mixture (H89-FR-2), goethite (GDS240), and hematite (GDS576).

References

Kokaly, R.F., Clark, R.N., Swayze, G.A., Livo, K.E., Hoefen, T.M., Pearson, N.C., ... & Klein, A.J. (2017). USGS spectral library version 7 (No. 1035). US Geological Survey.

Examples

## load the data into the environment
data('mineralRef')

## take the reference spectra for calcite
calcite <- mineralRef$calcite

AlexandreWadoux/soilspec documentation built on March 7, 2021, 1:54 p.m.