TITLE: Manganite HS138 DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: HS138

MINERAL_TYPE: Hydroxide

MINERAL: Manganite

FORMULA: MnO(OH)

FORMULA_HTML: MnO(OH)

COLLECTION_LOCALITY: Villa Grove, Colorado

ORIGINAL_DONOR: Hunt and Salisbury Collection

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION:

Trimorphous with Feitknechtite and Groutite.

The sample measured for the library was HS138.3 which was dry sieved to the grain size interval 74-250µm.

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

40 kV - 30 mA, 7.3-9.5 keV
File: mang138.out, -.mdi
References: JCPDS #24-735; Huebner's reference patterns; BUR-4120
Found: Pyrolusite, minor quartz, unidentified weak reflections at 4.2, 2.71, and 2.03 angstroms
Sought but not found: Manganite, ns?tite, ramsdellite, romanechite, ranceite

Comment: Pyrolusite has broad peaks; the relative intensities do not agree with the JCPDS pattern or a pattern of synthetic pyrolusite. The pyrolusite is poorly crystallized. The 4.2 angstroms reflection is in the position of the strongest groutite reflection (110), but the other two unidentified lines are not those of groutite.

J.S.Huebner, J. Pickrell, T. Schaefer, written communication (USGS)

END_XRD_ANALYSIS.

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

COMPOSITION_TRACE:

COMPOSITION_DISCUSSION:

None.

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 2895 0.2-3.0µm 200 g.s.= µm

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

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