Stilbite

Spectrum Details

Modality

UV-Vis

Category

mineral

Material Type

Tectosilicate

Sample ID

HS482.1B, HS482.2B, HS482.3B, HS482.4B, HS482.6

Collection Locality

Nova Scotia

Spectral Purity

1b2_3_4_ # HS482.1B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns SPECTRAL_PURITY: 1b2_3_4_ # HS482.2B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns SPECTRAL_PURITY: 1b2b3b4u # HS482.3B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns SPECTRAL_PURITY: 1b2_3_4_ # HS482.4B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns SPECTRAL_PURITY: 1b2_3_4_ # HS482.6 # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns

Composition / XRD

# XRF, EPMA, ICP(Trace), WChem COMPOSITION_TRACE:

Sample Description

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. Grain size fractions are indicated by the extension after the sample number: .1B = IMAGE_OF_SAMPLE:

XRD Analysis

40 kV- 30 mA, 6.5-9.5 keV File: stilb482.mdi 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 and others, 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.

X Units

nm

Y Units

Cross-section

Data Points

601