Clark and others 2007 USGS Data Series 231
Spectral Library splib06a Sample Description

(For further information on spectroscopy, see: http://speclab.cr.usgs.gov)

TITLE: Muscovite HS24 DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: HS24

MINERAL_TYPE: Phyllosilicate

MINERAL: Muscovite (Mica group)

FORMULA: KAl3Si3O10(OH)2

FORMULA_HTML: KAl₃Si₃O₁₀(OH)₂

COLLECTION_LOCALITY: Effingham Twp., Ontario

ORIGINAL_DONOR: Hunt and Salisbury Collection

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION:

"S-12. Muscovite. Effingham, Twp., Ontario (24). This light colored mica is essentially KAl₃Si₃O₁₀(OH)₃, but frequently contains small amounts of Fe⁺² and Fe⁺³, Mg, Ca, Na, Li, F, and Ti. It is a widespread and very common accessory mineral in igneous rocks, particularly acidic ones. It is also common in metamorphic rocks. This sample displays hydroxyl bands at 1.4µ and between 2.2 and 2.6µ. There is the suggestion of a ferrous ion band near 0.95µ. The two cross-overs of the larger size ranges are not significant, probably being caused by the tendency of the flat mica flakes to orient themselves horizontally, resulting in specular effects."

Sieve interval 74 - 250µm.

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.

IMAGE_OF_SAMPLE:
NO PHOTO

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

Not Available

END_XRD_ANALYSIS.

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

COMPOSITION_TRACE: None

COMPOSITION_DISCUSSION:

None

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

Not done yet

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1b2b3b4_ # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns

LIB_SPECTRA_HED:	where	Wave Range	Av_Rs_Pwr	Comment
LIB_SPECTRA:	splib04a r 3375	0.2-3.0µm	200	g.s.=
LIB_SPECTRA:	splib05a r 4817	0.2-3.0µm	200	g.s.=
LIB_SPECTRA:	splib06a r 15512			g.s.=
LIB_SPECTRA:	splib06a r 15524			g.s.=