Sample Description USGS Spectral Library Version 7

USGS Spectral Library Version 7 Sample Description

Kokaly, R.F., Clark, R.N., Swayze, G.A., Livo, K.E., Hoefen, T.M., Pearson, N.C., Wise, R.A., Benzel, W.M., Lowers, H.A., Driscoll, R.L., and Klein, A.J., 2017, USGS Spectral Library Version 7: U.S. Geological Survey Data Series 1035, 61 p., https://doi.org/10.3133/ds1035
_{For more information on the library, see:
local link
web link}

TITLE: Cronstedtite M3542 DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: M3542

MINERAL_TYPE: Phyllosilicate

MINERAL: Cronstedtite (Kaolinite-Serpentine group)

FORMULA: Fe+22Fe+3(Si,Fe+3)O5(OH)4

FORMULA_HTML: Fe₂⁺²Fe⁺³(Si,Fe⁺³)O₅(OH)₄

COLLECTION_LOCALITY: Cornwall, England

ORIGINAL_DONOR: Ed Olsen, Field Museum of Natural History

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION:

IMAGE_OF_SAMPLE:
NO PHOTO

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

Agrees with cronstedtite pattern PDF 17-470 (Ed Olsen, personal communication).

END_XRD_ANALYSIS.

COMPOSITIONAL_ANALYSIS_TYPE: None # XRF, EPMA, ICP(Trace), WChem

COMPOSITION_TRACE: None

COMPOSITION_DISCUSSION:

The cronstedtite occurs with quartz and may contain as much as 5% quartz (E. Olsen, personal communication). Spectrally there is no evidence of the presence of quartz.

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1b2b3b4_ # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns