DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: NMNH135231
MINERAL_TYPE: Tectosilicate
MINERAL: Microcline (Feldspar group)
FORMULA: KAlSi3O8
FORMULA_HTML: KAlSi3O8
COLLECTION_LOCALITY: Park County, Colorado
ORIGINAL_DONOR: National Museum of Natural History
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
Dimorphous with Orthoclase.
Sieve interval 0 - 74µm.
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
Contains microcline plus a small amount of albite (Norma Vergo).
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:
Weak absorption at 0.64 microns suggest this sample has chlorophyll or other organic pigment. It is possible that it has remains of cryptoendoliths or other mineral contamination not detected by X-ray analysis. It has relatively stronger organic absorptions at 3.4 microns. G. Swayze.
END_SPECTROSCOPIC_DISCUSSION.
SPECTRAL_PURITY: 1c2c3c4c # NMNH135231 # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns