Clark et. al. 2003 USGS Open File Report 03-395
Spectral Library splib05a Sample Description

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

TITLE: Beryl GDS9 DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: GDS9

MINERAL_TYPE: Cyclosilicate

MINERAL: Beryl

FORMULA: Be3Al2Si6O18

FORMULA_HTML: Be₃Al₂Si₆O₁₈

COLLECTION_LOCALITY: Maine, USA

ORIGINAL_DONOR: Wards Natural Science Collection

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION:

None

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

Beryl + trace other (Norma Vergo).

END_XRD_ANALYSIS.

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

COMPOSITION_TRACE: None

COMPOSITION_DISCUSSION:

None

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

Bimodal grains size distribution:

population 1 140µm 97 vol%
population 2 15µm 3 vol%

avg. grain size of populations = 138µm

Conchoidally fractured grains, trace of opaque material, length fast, uniaxial (-). Smaller grains slightly adhere to larger grains. G. Swayze.

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1b2_3_4_ # 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 666	0.2-3.0µm	200	g.s.= 138 µm
LIB_SPECTRA:	splib05a r 1318	0.2-3.0µm	200	g.s.=

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U.S. Department of the Interior | U.S. Geological Survey URL: https://pubsdata.usgs.gov/pubs/of/2003/ofr-03-395/DESCRIPT/M/beryl_gds9.html Questions or Assistance: USGS Web Contact Page Last Modified: Sat Jan 12 23:29 EST 2013