Brookite

Spectrum Details

Modality

NIR

Category

mineral

Material Type

Oxide

Sample ID

HS443.2B, HS443.6

Collection Locality

Arkansas

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

Composition / XRD

None # XRF, EPMA, ICP(Trace), WChem

Sample Description

Trimorphous with Anatase and Rutile. Grain size fractions are indicated by the extension after the sample number: .2B = IMAGE_OF_SAMPLE:

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)

X Units

cm⁻¹

Y Units

Absorbance

Data Points

2,126