DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: NMNH92669-4
MINERAL_TYPE: Sulfate
MINERAL: Polyhalite
FORMULA: K2Ca2Mg(SO4)4*2H2O
FORMULA_HTML: K2Ca2Mg(SO4)4•2H2O
COLLECTION_LOCALITY: Carlsbad, New Mexico
ORIGINAL_DONOR: Smithsonian
CURRENT_SAMPLE_LOCATION: USGS Reston, Virginia
ULTIMATE_SAMPLE_LOCATION: USGS Reston, Virginia
SAMPLE_DESCRIPTION:
Spectrum originally published in: Crowley, J.K., 1991, Visible and Near-Infrared (0.4 - 2.5µm) Reflectance Spectra of Playa Evaporite Minerals: Journal of Geophysical Research, vol 96, no.B10, p. 16,231-16,240.
IMAGE_OF_SAMPLE:
NO PHOTO
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
Pure polyhalite. (Crowley, 1991)
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: None # XRF, EPMA, ICP(Trace), WChem
COMPOSITION_TRACE: None
COMPOSITION_DISCUSSION:
None
END_COMPOSITION_DISCUSSION.
MICROSCOPIC_EXAMINATION:
END_MICROSCOPIC_EXAMINATION.
SPECTROSCOPIC_DISCUSSION:
END_SPECTROSCOPIC_DISCUSSION.
SPECTRAL_PURITY: 1a2a3a4u # NMNH92669-4 # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns