TITLE: Alunite AL706 DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: AL706

MINERAL_TYPE: Sulfate

MINERAL: Alunite (Alunite group)

FORMULA: (Na,K)Al3(SO4)2(OH)6

FORMULA_HTML: (Na,K)Al3(SO4)2(OH)6

COLLECTION_LOCALITY: Sulfur, Nevada

ORIGINAL_DONOR: Ron Lyon, Stanford University

CURRENT_SAMPLE_LOCATION: CSES/CIRES, Univ. of CO, Boulder

ULTIMATE_SAMPLE_LOCATION: CSES/CIRES, Univ. of CO, Boulder

SAMPLE_DESCRIPTION:

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

Alunite
Contaminant phases: smectite, quartz, minor amounts.

Kruse, F.A., and P.L. Hauff, eds., 1992, The IGCP-264 Spectral Properties Database. IUSG/UNESCO, Special Publication, 211p., (in press).

END_XRD_ANALYSIS.

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

COMPOSITION_TRACE: None

COMPOSITION_DISCUSSION:

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

avg gr sz = 15 µm
Length fast, 1st order gray, sample looks pure but small grain size prevents determination of optical sign. G. Swayze.

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 239 0.2-3.0µm 200 g.s.= 15 µm

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

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