TITLE: Stilbite HS482 Zeolite DESCRIPT
MINERAL: Stilbite (Zeolite Group)
COLLECTION_LOCALITY: Nova Scotia
ORIGINAL_DONOR: Hunt and Salisbury Collection
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
A spectrum for this sample was published in: 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.
With the note: "The major water features occur at 0.985, 1.17, 1.44, 1.92µm and the bands are generally broad and not well resolved. The reflectivities for sizes I through IV are 98, 91, 79, and 62% at 1.1µm.
40 kV- 30 mA, 6.5-9.5 keV
References: Tschernich (1992); PDF2 #24-0894, 25-0124, 26-584, 29-1185, 41-1356, 41-1357, 44-1479; Akizuki and Konno (1985)
Found: Barrierite, stellerite, or stilbite
Comments: Sharp peaks but poorly resolved alpha1-alpha2 reflections are consistent with some variation in composition or structural order. The pattern was indexed by comparison with PDF2 #26-0584 (stilbite, calculated by D. Smith et al., 1970). A moderately weak shoulder on the larger d-spacing side of the (020) is the only unexplained feature. Line-base search-match returns barrierite, stellerite, and stibite; profile-based search-match returns only barrierite. These three species are so closely related that they might all better be considered stilbite (Tschernich, 1992). Visual comparison of overlaid patterns indicates that barrierite (29-1185), stellerite (25-0124), and stilbite (44-1479)are each an excellent match for HS-482. Another stilbite (24-0894) and structurally related heulandite and brewsterite are poor matches and were eliminated as possibilities.
COMPOSITIONAL_ANALYSIS_TYPE: # XRF, EM(WDS), ICP(Trace), WChem
LIB_SPECTRA_HED: where Wave Range Av_Rs_Pwr Comment
LIB_SPECTRA: splib04a r 4635 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.=