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: Almandine WS479 Garnet DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: WS479

MINERAL_TYPE: Nesosilicate

MINERAL: Almandine (Garnet group)

FORMULA: (Fe+2)3Al2(SiO4)3

FORMULA_HTML: Fe⁺²₃Al₂(SiO₄)₃

COLLECTION_LOCALITY: Ampandrambaika, Malagasy

ORIGINAL_DONOR: Ward Science Collection

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION:

Forms series with Pyrope and with Spessartine.

IMAGE_OF_SAMPLE:

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

Not Available

END_XRD_ANALYSIS.

COMPOSITIONAL_ANALYSIS_TYPE: EM # XRF, EM(WDS), ICP(Trace), WChem

COMPOSITION KEYWORD	Oxide ASCII	Amount	Weight Percent, %	Oxide html
COMPOSITION:	SiO2	37.34	wt%	SiO2
COMPOSITION:	TiO2	0.08	wt%	TiO2
COMPOSITION:	Al2O3	21.93	wt%	Al2O3
COMPOSITION:	Cr2O3	0.02	wt%	Cr2O3
COMPOSITION:	V2O3	0.02	wt%	V2O3
COMPOSITION:	FeO	32.23	wt%	FeO
COMPOSITION:	NiO	0.01	wt%	NiO
COMPOSITION:	MnO	1.70	wt%	MnO
COMPOSITION:	MgO	8.83	wt%	MgO
COMPOSITION:	CaO	1.62	wt%	CaO
COMPOSITION:	Total	103.78	wt%
COMPOSITION:	O=Cl,F,S		wt%	#correction for Cl, F, S
COMPOSITION:	New Total	103.78	wt%

COMPOSITION_TRACE: None

COMPOSITION_DISCUSSION:

None

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

avg. grain size = 125µm Range = 10 - 295µm

Trace of opaques, conchoidal fractured garnet grains, with 15% of garnet grains containing non-isotropic inclusions. G. Swayze.

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1b2b3b4b # 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 193	0.2-3.0µm	200	g.s.= 125 µm
LIB_SPECTRA:	splib05a r 258	0.2-3.0µm	200	g.s.=
LIB_SPECTRA:	splib06a r 911			g.s.=
LIB_SPECTRA:	splib06a r 924			g.s.=