DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: HS8

MINERAL_TYPE: Phyllosilicate

MINERAL: Serpentine

FORMULA: Mg3Si2O5(OH)4

FORMULA_HTML: Mg₃Si₂O₅(OH)₄

COLLECTION_LOCALITY: Cardiff, Missouri

ORIGINAL_DONOR: Hunt and Salisbury Collection

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION:

"S-19. Serpentine. Cardiff, Mo. (8). Serpentine is a hydrous secondary mineral, typically an alteration product of olivine, pyroxene, or amphibole. Its compostion is Mg₃Si₂O₅(OH)₄, but ferrous iron and nickel may be present in small amount. Weak ferric and ferrous ion bands are displayed by this sample near 0.7 and 1.0µ respectively, which may be original, or due to the presence of a small amount of unaltered amphibole. The bands near 1.4µ and longward of 1.9µ are hydroxyl bands. As in the case of some amphiboles and pyroxenes, this sample displays a peak near 0.5µ in the visible due to the combined effect of the ferric ion band in the near-infrared and the fall-off in the blue."

Hunt, G.R., J.W. Salisbury, 1970, Visible and near-infrared spectra of minerals and rocks: I. Silicate minerals. Modern Geology, v. 1, p. 283-300.

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

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 4435 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.=