Spectra Used in Figures

This dataset contains reflectance and transmission spectra of unexpanded and expanded vermiculite ore, and handpicked flakes of phlogopite, hydrobiotite, and vermiculite. These samples were collected from mines near Enoree, South Carolina; Libby, Montana; Louisa, Virginia; Palabora, Llano, Texas; and South Africa. Spectra are identified as either reflectance or transmission in the alphanumeric file names and correlate to specpr record numbers designated in the manuscript figures in which they are shown. These transmission spectra were converted to absorbance in many of the figures. Spectra of talc, fibrous richterite amphibole, and serpentine are from well characterized samples from Feiser Mine, Ruby Mountains, Montana; Libby, Montana; and a NIOSH chrysotile standard (CH29) respectively. The talc sample is described in the U.S. Geological Survey Spectral Library (Kokaly and others, 2017). Some vermiculite samples were K-exchanged to facilitate spectral comparisons.

Data and Resources

Field Value
accessLevel public
bureauCode {010:12}
catalog_@context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
catalog_conformsTo https://project-open-data.cio.gov/v1.1/schema
catalog_describedBy https://project-open-data.cio.gov/v1.1/schema/catalog.json
identifier USGS:58797a45e4b0847d353f4044
metadata_type geospatial
modified 20200929
old-spatial -128.7597656235, 23.684373489276, -62.490234376141, 49.922653763102
publisher U.S. Geological Survey
publisher_hierarchy Department of the Interior > U.S. Geological Survey
resource-type Dataset
source_datajson_identifier true
source_hash 88d74a82f2b99dd08df82d8c86fc9d7fbcad2d9b
source_schema_version 1.1
spatial {"type": "Polygon", "coordinates": [[[-128.7597656235, 23.684373489276], [-128.7597656235, 49.922653763102], [ -62.490234376141, 49.922653763102], [ -62.490234376141, 23.684373489276], [-128.7597656235, 23.684373489276]]]}
theme {geospatial}
Groups
  • AmeriGEOSS
  • National Provider
  • North America
Tags
  • amerigeo
  • amerigeoss
  • central-minerals-and-environmental-resources-science-center
  • cggsc
  • chemical-analysis
  • china
  • ckan
  • cmersc
  • crustal-geophysics-and-geochemistry-science-center
  • electron-probe-microanalysis
  • elongate-amphiboles
  • enoree
  • environment
  • expanded-vermiculite
  • geo
  • geoscientificinformation
  • geoss
  • jiangsu
  • libby
  • louisa
  • mineral-deposits
  • mineral-resources-program
  • mineralogy
  • montana
  • mrp
  • national
  • north-america
  • palabora
  • provenance
  • reflectance-spectroscopy
  • scanning-electron-microscopy
  • south-africa
  • south-carolina
  • spectroscopy
  • united-states
  • usgs-58797a45e4b0847d353f4044
  • vermiculite-insulation
  • virginia
  • vspec-technique
  • x-ray-diffraction
isopen False
license_id notspecified
license_title License not specified
maintainer Gregg Swayze
maintainer_email gswayze@usgs.gov
metadata_created 2025-11-22T21:11:49.416159
metadata_modified 2025-11-22T21:11:49.416164
notes This dataset contains reflectance and transmission spectra of unexpanded and expanded vermiculite ore, and handpicked flakes of phlogopite, hydrobiotite, and vermiculite. These samples were collected from mines near Enoree, South Carolina; Libby, Montana; Louisa, Virginia; Palabora, Llano, Texas; and South Africa. Spectra are identified as either reflectance or transmission in the alphanumeric file names and correlate to specpr record numbers designated in the manuscript figures in which they are shown. These transmission spectra were converted to absorbance in many of the figures. Spectra of talc, fibrous richterite amphibole, and serpentine are from well characterized samples from Feiser Mine, Ruby Mountains, Montana; Libby, Montana; and a NIOSH chrysotile standard (CH29) respectively. The talc sample is described in the U.S. Geological Survey Spectral Library (Kokaly and others, 2017). Some vermiculite samples were K-exchanged to facilitate spectral comparisons.
num_resources 2
num_tags 40
title Spectra Used in Figures