Hematite.02+Quartz.98

Spectrum Details

Modality

NIR

Category

soil

Material Type

Intimate

Sample ID

GDS76

Collection Locality

Laboratory mixture

Spectral Purity

1a2_3_4_ # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns

Composition / XRD

NONE

Sample Description

Hematite GDS27 2 wt% + 98 wt% Pure crystal quartz (less than 250 µm grain sizes)

XRD Analysis

40 kV - 30 mA, 6.5-9.5 keV File: hemqtz76_mdi (smear on quartz plate) References: Huebner's reference patterns; Borg and Smith (1969); PDF2 #33-1161, 33-664 Found: Quartz, trace hematite Comments: Quartz reflections are extremely sharp with excellent resolution of alpha1-alpha2 components. Six very weak to barely significant hematite reflections were observed. The strip chart shows reflections at 3.11, 3.07, 3.06, and 2.66 angstroms; only the 2.66 angstrom peak appears significant in the raw data, and none are present after routine filtering by Jade. There are several other very weak reflections (3.11-3.06, 2.66 angstroms) seen only in the strip chart.

X Units

cm⁻¹

Y Units

Absorbance

Data Points

2,126