Pyrolusite

Spectrum Details

Modality

FTIR

Category

mineral

Material Type

Oxide

Sample ID

HS138.3B, HS138.4B

Collection Locality

Villa Grove, Colorado

Spectral Purity

1b2b3c4u # HS138.3B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns

Composition / XRD

None # XRF, EPMA, ICP(Trace), WChem COMPOSITION_TRACE:

Sample Description

Trimorphous with Akhtenskite and Ramsdellite. Grain size fractions are indicated by the extension after the sample number: .1B = IMAGE_OF_SAMPLE: NO PHOTO

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, 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) Additional analysis: Pyrolusite (major), quartz (minor), goethite (trace), groutite (?), pyrite (?). Analysis by Steve Sutley

X Units

cm⁻¹

Y Units

Absorbance

Data Points

1,801