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The problem of rock mechanics and engineering is an old and new subject encountered by human beings in their struggle with nature for survival and development. To call it ancient means that it has a long history; however, speaking of it as brand-new refers to the continuous emergence of new problems and new situations in engineering practice, which is quite challenging. With the development of human engineering activities, the issues surrounding rock engineering are becoming more and more prominent, and the problems encountered are becoming more and more complex. In the practice of solving complex rock engineering, human beings have summarized many topics that are difficult to explain or solve with classical mechanics.

Technology: general issues --- History of engineering & technology --- kaolin --- cemented coal gangue-fly ash backfill sample --- mechanical properties --- macroscopic failure --- microstructure --- non-pillar coal mining --- crushed rocks --- compression test --- deformation characteristics --- lateral stress --- tunnel through fault --- concrete lining structure --- fault dislocation --- seismic deterioration effect --- dynamic contact force --- seismic damage analysis --- directions of incident waves --- slope topography --- amplification effects --- ground motions --- equivalent nodal forces --- tight sandstone gas reservoirs --- rock-physics template --- Biot–Rayleigh theory --- total porosity --- microcrack porosity --- n/a --- Biot-Rayleigh theory

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In 2018, the International Symposium on Nanogeoscience was held in Guiyang, China. Scholars from around the globe gathered to discuss recent progress and development trends in various aspects of nanogeoscience, including nanomineralogy. Nanomineralogy, an important aspect of nanogeoscience, focuses on the composition, structure, and physical and chemical properties of nanoscale minerals and their interrelations with other Earth critical components. To give a sampling of the latest progress in nanomineralogy and related fields, we offer this Special Issue, which describes a full range of recent nanomineralogic achievements relating to everything from nanominerals and geochemistry, mineral nanostructures, and nanomineral deformation, to nanopores in oil and gas reservoirs, nanomineral deposits, and nanomineral material. Today, nanomineralogy faces a new strategic opportunity as well as a revolutionary challenge. We thus present this special nanomineralogy-focused issue of Minerals with the aim of encouraging our colleagues to familiarize themselves with current developments, trends, and directions in nanomineralogy, enabling an understanding of the potential of the field as a whole. We look forward to developing further scientific research and cooperation in nanomineralogy, hoping thereby to attract and guide young scholars to participate in this field.

Research & information: general --- Earth sciences, geography, environment, planning --- preparation --- hydroxysodalite --- bentonite --- alkali-activation --- water-bath --- total porosity --- shale gas reservoir --- Longmaxi Formation --- Southeast Chongqing --- pyrite --- thermal treatment --- pyrrhotite --- Hg(II) removal --- mechanism --- Changling Fault Depression --- Shahezi Formation --- fractal dimensions --- pore structure --- shale lithofacies --- lacustrine shales --- pore networks --- pore connectivity --- spontaneous fluid imbibition --- Shahezi shales --- Sm-Nd dating --- Shuiyindong --- Carlin-type gold deposit --- Southwestern China --- southern North China --- marine shale --- nanopore structure --- heterogeneity --- fractal dimension --- calcium carbonate --- mesopore --- amoxicillin --- adsorption --- kinetics --- thermodynamics --- nanocubic pyrite --- hydrothermal synthesis --- greigite --- thiourea --- iron --- nanoparticle --- Fe --- nanomaterial --- colloid --- L-edge XANES --- speciation --- hierarchical nanocomposite --- sepiolite --- clay mineral --- heavy metals --- water treatment --- nanograins --- principal slip zone --- crystallographic preferred orientation --- amorphization --- mirror-slip surface --- faults --- earthquakes --- localization --- Nantuo Formation --- syn-glacial dolostone --- rare earth elements --- ferruginous conditions --- South China --- nanostructure --- OM-clay aggregate --- silica nanograin --- tectonic and thermal evolution --- Longmaxi Formation shale --- N2 adsorption --- helium ion microscope --- minerals --- trace elements --- major elements --- fault zone --- tectonically deformed coal --- differentiation mechanism --- metallic nanoparticles --- migration mechanism --- prospecting --- Shenjiayao gold deposit --- syngenetic framboids --- diagenetic framboids --- paleoredox conditions --- shale gas content --- middle Yangtze area --- nanocrystalline rutile --- phase transition --- metallization --- high pressure --- diamond anvil cell --- preparation --- hydroxysodalite --- bentonite --- alkali-activation --- water-bath --- total porosity --- shale gas reservoir --- Longmaxi Formation --- Southeast Chongqing --- pyrite --- thermal treatment --- pyrrhotite --- Hg(II) removal --- mechanism --- Changling Fault Depression --- Shahezi Formation --- fractal dimensions --- pore structure --- shale lithofacies --- lacustrine shales --- pore networks --- pore connectivity --- spontaneous fluid imbibition --- Shahezi shales --- Sm-Nd dating --- Shuiyindong --- Carlin-type gold deposit --- Southwestern China --- southern North China --- marine shale --- nanopore structure --- heterogeneity --- fractal dimension --- calcium carbonate --- mesopore --- amoxicillin --- adsorption --- kinetics --- thermodynamics --- nanocubic pyrite --- hydrothermal synthesis --- greigite --- thiourea --- iron --- nanoparticle --- Fe --- nanomaterial --- colloid --- L-edge XANES --- speciation --- hierarchical nanocomposite --- sepiolite --- clay mineral --- heavy metals --- water treatment --- nanograins --- principal slip zone --- crystallographic preferred orientation --- amorphization --- mirror-slip surface --- faults --- earthquakes --- localization --- Nantuo Formation --- syn-glacial dolostone --- rare earth elements --- ferruginous conditions --- South China --- nanostructure --- OM-clay aggregate --- silica nanograin --- tectonic and thermal evolution --- Longmaxi Formation shale --- N2 adsorption --- helium ion microscope --- minerals --- trace elements --- major elements --- fault zone --- tectonically deformed coal --- differentiation mechanism --- metallic nanoparticles --- migration mechanism --- prospecting --- Shenjiayao gold deposit --- syngenetic framboids --- diagenetic framboids --- paleoredox conditions --- shale gas content --- middle Yangtze area --- nanocrystalline rutile --- phase transition --- metallization --- high pressure --- diamond anvil cell