MINERAL: Chrysotile (Kaolinite-Serpentine Group)
COLLECTION_LOCALITY: California Asbestos Quarry near New Melones Reservoir, CA
ORIGINAL_DONOR: California Asbestos Corporation
CURRENT_SAMPLE_LOCATION: U.S.G.S. Denver Spectroscopy Laboratory.
ULTIMATE_SAMPLE_LOCATION: U.S.G.S. Denver Spectroscopy Laboratory.
Fine fiber Chrysotile
Sample from the California Asbestos Quarry located 1 km west of the New Melones Reservoir and 16 km west of Sonora, California in the foothills of the Sierra Nevada. Sample was collected from the NE pit wall in Dec. of 1999. Sample is from a vein of fibrous chrysotile sandwiched between massive antigorite wall rock. Sample used for spectral and XRD analysis was hand picked.
XRD done by Jim Post indicates sample is chrysotile with considerable magnetite intermixed.
COMPOSITIONAL_ANALYSIS_TYPE: NONE # XRF, EPMA, ICP(Trace),WChem
Spectrum is typical of chrysotile with strong Fe-absorptions in the 0.5- 1.3 micron region and sharp vibrational features at 1.389, 2.126, and 2.3255 microns. The 1.389 micron absorption is the 1st overtone of the OH stretch while the 2.3255 micron absorption is the Mg-OH combination band. There is no spectral evidence of the magnetite which probably just lowers the overall reflectance of the sample.
SPECTRAL_PURITY: 1b2_3_4_ # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns