- Modality
- NIR
- Category
- mineral
- Material Type
- Inosilicate
- Sample ID
- HS336.1B, HS336.2B, HS336.3B, HS336.4B, HS336.6
- Collection Locality
- Sweden
- Spectral Purity
- 1c2_3_4_ # HS336.1B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns SPECTRAL_PURITY: 1c2_3_4_ # HS336.2B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns SPECTRAL_PURITY: 1c2c3c4c # HS336.3B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns SPECTRAL_PURITY: 1c2_3_4_ # HS336.4B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns SPECTRAL_PURITY: 1c2_3_4_ # HS336.6 # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
- Composition / XRD
- None # XRF, EPMA, ICP(Trace), WChem COMPOSITION_TRACE:
- Sample Description
- "I-21 Richterite 336B--Sweden. Na2Ca(Mg, Fe^2+, Mn, Fe^3+, Al)5(Si8O22)(OH, F)2: This mineral occurs in thermally metamorphosed limestone's and skarns, and is also found as a hydrothermal product in veins in alkaline igneous rocks. This sample is contaminated with 30% magnetite, which reduces the overall reflectivity. It would also serve to quench the iron bands, were any displayed. However, the curve shown is for a sample cleaned of all magnetite, and it is still surprisingly free of electronic transition bands for an amphibole. The only well defined features are the 1.4µ OH band, which is clearly doubled, and the two OH bands near 2.32µ and 2.38µ." 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. Grain size fractions are indicated by the extension after the sample number: .1B = IMAGE_OF_SAMPLE: NO PHOTO
- XRD Analysis
- Richterite (possibly fluoro-richterite) is major phase with diopside, mica, and at least one other trace mineral present. B. Benzel.
- X Units
- cm⁻¹
- Y Units
- Absorbance
- Data Points
- 2,126