TITLE: Microcline HS103 Feldspar DESCRIPT
MINERAL: Microcline (Feldspar group)
COLLECTION_LOCALITY: Crystal Peak, Colorado
ORIGINAL_DONOR: Hunt and Salisbury Collection
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
Dimorphous with Orthoclase.
"This spectrum (103B) displays as its major feature a broad band near 1.3µ similar to the ferrous ion band in the two anorthites above. This sample is quite pure in hand specimen, but Deer et al. (1963) note that alkali feldspars are a series varying from pure KAlSi3O8 (microcline) to pure NaAlSi3O8 (albite) but they normally also contain a small amount of CaAl2-Si2O8 (anorthite). It appears that the anorthite fraction of this microcline contains substituted ferrous iron as in the anorthites above, which also accounts for the bands in the visible at 0.38 and 0.42µ. Weak bands at 1.9 and 2.5µ are due to included water, while the 2.2µ band is due to the combination involving the AlOH bend."
Sieve interval 74 - 250µm.
Hunt, G.R., J.W. Salisbury, and C.J. Lenhoff, 1973, Visible and near-infrared spectra of minerals and rocks: VI. Additional silicates. Modern Geology, v. 4, p. 85-106.
Max. microcline + albite(L) + quartz(m)
COMPOSITIONAL_ANALYSIS_TYPE: None # XRF, EM(WDS), ICP(Trace), WChem
Not done yet
LIB_SPECTRA_HED: where Wave Range Av_Rs_Pwr Comment
LIB_SPECTRA: splib04a r 2990 0.2-3.0µm 200 g.s.=
LIB_SPECTRA: splib05a r ____ 0.2-3.0µm 200 g.s.=
LIB_SPECTRA: splib06a r ____ 1.5-25µm 250 g.s.=