DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: WS681
MINERAL_TYPE: Phyllosilicate
MINERAL: Vermiculite
FORMULA: (Mg,Fe+2,Al)3(Al,Si)4O10(OH)2*4H2O
FORMULA_HTML: (Mg,Fe+2,Al)3(Al,Si)4O10(OH)2•4H2O
COLLECTION_LOCALITY: Kent, Connecticut
ORIGINAL_DONOR: Ward Natural Science Collection
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
Vermiculite and mica-rich mixed layer phase, probably dioctahedral (Norma Vergo).
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: None # XRF, EPMA, ICP(Trace), WChem
COMPOSITION_TRACE:
COMPOSITION_DISCUSSION:
END_COMPOSITION_DISCUSSION.
MICROSCOPIC_EXAMINATION:
END_MICROSCOPIC_EXAMINATION.
SPECTROSCOPIC_DISCUSSION:
The spectrum is consistent with pure vermiculite perhaps with a hydrobiotite (mixed layered) component. This is typical of vermiculite ore. G. Swayze.
END_SPECTROSCOPIC_DISCUSSION.
SPECTRAL_PURITY: 1c2c3c4_ # WS681 # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns