منابع مشابه
Optical Mineralogy
II. Polarizing light microscope and geological samples III. Refractive index and its measurement IV. Optical classes-indicatrix theory V. Relationship of optical properties to crystal chemistry VI. Advanced methods in optical mineralogy GLOSSARY anisotropic mineral: A mineral with more than one principal refractive index. birefringence: The mathematical difference between the largest and smalle...
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The bulk of the comet 81P/Wild 2 (hereafter Wild 2) samples returned to Earth by the Stardust spacecraft appear to be weakly constructed mixtures of nanometer-scale grains, with occasional much larger (over 1 micrometer) ferromagnesian silicates, Fe-Ni sulfides, Fe-Ni metal, and accessory phases. The very wide range of olivine and low-Ca pyroxene compositions in comet Wild 2 requires a wide ran...
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Carle M. Pieters*, Joseph Boardman, Bonnie Buratti, Alok Chatterjee, Roger Clark, Tom Glavich, Robert Green, James Head III, Peter Isaacson, Erick Malaret, Thomas McCord, John Mustard, Noah Petro, Cassandra Runyon, Matthew Staid, Jessica Sunshine, Lawrence Taylor, Stefanie Tompkins, Padma Varanasi and Mary White Department of Geological Sciences, Brown University, Providence, RI 02912, USA Anal...
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[1] The last major phases of lunar volcanism produced spectrally unique high‐titanium basalts on the western nearside of the Moon. The Moon Mineralogy Mapper (M) on Chandrayaan‐1 has provided detailed measurements of these basalts at spatial and spectral resolutions necessary for mineralogical interpretation and mapping of distinct compositional units. The M3 imaging spectrometer acquired data ...
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Over the past fifty years the mineralogy and crystal chemistry of the materials called asbestos have been refined leading to better identification through new and more sensitive techniques. The health aspects of the exposure to fibrous inorganic species are also equally well determined from the anatomical to the biochemical levels. Integrating the efforts of many researchers from a diversity of...
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ژورنال
عنوان ژورنال: Nature
سال: 1937
ISSN: 0028-0836,1476-4687
DOI: 10.1038/139133a0