DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: HS443.2B, HS443.6
MINERAL_TYPE: Oxide
MINERAL: Brookite (Rutile group)
FORMULA: TiO2
FORMULA_HTML: TiO2
COLLECTION_LOCALITY: Arkansas
ORIGINAL_DONOR: Hunt and Salisbury Collection
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
Trimorphous with Anatase and Rutile.
Grain size fractions are indicated by the extension after the sample number:
.2B = <74 µm
.6 = cut slab
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
40 kV - 30 mA, 6.5-9.5 keV
File: brkt443.out, -.mdi
References: JCPDS #29-1360
Found: Brookite, minor quartz, very weak reflections at 1.716, 1.373 Angstroms.
Comment: Based on sharpness of reflections, brookite is exceptionally well
crystallized.
J.S. Huebner, J. Pickrell, and T. Schaefer, 1994,written communication(USGS)
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: None # XRF, EPMA, ICP(Trace), WChem
COMPOSITION_TRACE: None
COMPOSITION_DISCUSSION:
END_COMPOSITION_DISCUSSION.
MICROSCOPIC_EXAMINATION:
END_MICROSCOPIC_EXAMINATION.
SPECTROSCOPIC_DISCUSSION:
END_SPECTROSCOPIC_DISCUSSION.
SPECTRAL_PURITY: 1b2b3c4_ # Brookite HS443.2B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
SPECTRAL_PURITY: 1b2_3_4_ # Brookite HS443.6 # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns