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DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: HS441.1B, HS441.2B, HS441.3B, HS441.4B
MINERAL_TYPE: Borate
MINERAL: Ulexite
FORMULA: NaCaB5O9*8H2O
FORMULA_HTML: NaCaB5O9•8H2O
COLLECTION_LOCALITY: California
ORIGINAL_DONOR: Hunt and Salisbury Collection
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
Hydrous borate.
Grain size fractions are indicated by the extension after the sample number:
.1B = <5 µm
.2B = <74 µm
.3B = 74-250 µm
.4B = 250-1200 µm
IMAGE_OF_SAMPLE:
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
40 kV - 30 mA, 6.5-9.5 keV [smear mount of ground sample is
ulexite.out, bulk mount or random mount of unground sample is
ulexite2.out]
References: JCPDS #12-419 (from Clark and Christ, 1959; Ghose
and others, 1978)
Found: Ulexite
Comments: There are so many peaks that reflections of a second
phase, if present could be obscured by overlap. Pattern
ulexite2.out is extraordinary and was indexed successfully to about
35 degrees 2 theta using powder intensities calculated from the
structure of Ghose and others (1978). Reflections are very sharp,
indicating a high degree of crystallinity and compositional
heterogeneity.
J.S. Huebner and J. Pickrell, unpublished data, written communication, USGS, Reston, VA (1993)
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: None # XRF, EPMA, ICP(Trace), WChem
COMPOSITION_TRACE: None
COMPOSITION_DISCUSSION:
None
END_COMPOSITION_DISCUSSION.
MICROSCOPIC_EXAMINATION:
END_MICROSCOPIC_EXAMINATION.
SPECTROSCOPIC_DISCUSSION:
END_SPECTROSCOPIC_DISCUSSION.
SPECTRAL_PURITY: 1a2_3_4_ # HS441.1B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
SPECTRAL_PURITY: 1a2_3_4_ # HS441.2B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
SPECTRAL_PURITY: 1a2a3a4_ # HS441.3B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
SPECTRAL_PURITY: 1a2_3_4_ # HS441.4B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns