DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: HS345

MINERAL_TYPE: Inosilicate

MINERAL: Uralite (Amphibole group)

FORMULA: Ca2(Mg,Fe2+)5(Si8O22)(OH,F)2

FORMULA_HTML: Ca₂(Mg,Fe²⁺)₅(Si₈O₂₂)(OH,F)₂

COLLECTION_LOCALITY: Calumet, Colorado

ORIGINAL_DONOR: Hunt and Salisbury Collection

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION:

I-15 Uralite 345B--Calumet, Colo. Ca₂(Mg,Fe²⁺)₅(Si₈O₂₂)(OH,F)₂: This is a hornblende formed by alteration of pyroxenes. It is generally actinolitic in composition, but often contains aluminum (Deer et al., 1963). Its spectrum shows a doubled iron feature near 0.75 and 1.0µ, the former due to Fe³⁺ substituting for Al, the latter due to Fe²⁺ substituting for Mg. The 1.4µ hydroxyl feature is considerably weaker than the 2.32µ and 2.38µ hdroxyl bands. The 1.9µ band indicates a slight amount of included water."

Sieve interval 74 - 250µm.

Hunt, G.R., J.W. Salisbury, and C.J. Lenhoff, 1973, Visible and near-infrared spectra of minerals and rocks: VI. Additional silicates. Modern Geology, v. 4, p. 85-106.

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

Amphibole - major (hornblende?)
Clinopyroxene - major (augite?)
Unidentifiable residual
Note: Uralite is described as an amphibole psuedomorphous after pyroxene.

Konnert, Judith and Marta Flohr, 1992, unpublished data, USGS Reston, VA.

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 5085 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.=