DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: GDS76

MINERAL_TYPE: Oxide

MINERAL: Hematite (2%) + Quartz (98%) (Hematite group)

FORMULA: alpha-Fe2O3 + SiO2

FORMULA_HTML: alpha-Fe₂O₃ + SiO₂

COLLECTION_LOCALITY: Laboratory mixture

ORIGINAL_DONOR:

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION:

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

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

40 kV - 30 mA, 6.5-9.5 keV
File: hemqtz76.mdi (smear on qtz 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.

END_XRD_ANALYSIS.

COMPOSITIONAL_ANALYSIS_TYPE: None # XRF, EM(WDS), ICP(Trace), WChem

COMPOSITION_TRACE:

COMPOSITION_DISCUSSION:

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1_2_3_4_

LIB_SPECTRA_HED: where Wave Range Av_Rs_Pwr Comment

LIB_SPECTRA: splib04a r 2015 0.2-3.0µm 200 g.s.=

LIB_SPECTRA: splib05a r ____ 0.2-3.0µm 200 g.s.=

LIB_SPECTRA: splib06a r ____ 1.5-25µm 250 g.s.=