U.S. Geological Survey home page

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: Brookite HS443 DESCRIPT

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

IMAGE_OF_SAMPLE:
Photo of sample

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