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In the last decades, there has been increasing interest in Naturally Occurring Asbestos (NOA) and asbestos containing materials (ACMs) as a source of possible environmental risk. A crucial theme of interest related to environmental pollution is the enhanced mobilization of asbestos minerals affecting soils and rocks due to human activities (e.g., road construction, mining activity) in comparison with natural weathering processes. The volume has aimed to gather contributions and to compare results derived from various experiences of research groups regarding NOA minerals as a source of possible environmental risks for population. Case studies from various geological contexts are presented. Moreover, contributions presenting novel and classical approaches for ACM inertization and recycling, together with possible solutions for reducing asbestos exposure, has been also presented.

asbestos-containing materials --- recycling --- thermal treatment --- melting process --- aggregates --- serpentine varieties --- naturally occurring asbestos --- health hazard --- serpentinite soil --- asbestos’ minerals --- edenite --- serpentinites --- Southern Italy --- rhino white marble of Namibia --- tremolite --- fibrous habitus --- health hazard --- texture --- naturally occurring asbestos --- morphology --- cleavage fragments --- asbestiform and fibrous minerals --- environmental monitoring --- naturally occurring asbestos --- serpentinites --- polymorphs --- health hazard --- XRD --- SEM --- IR --- RD-UV-Vis spectroscopy --- chrysotile --- antigorite --- lizardite characterization --- tremolite --- Naturally Occurring Asbestos (NOA) --- asbestos --- grinding test --- PCOM --- image analysis --- n/a

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This Special Issue covers a broad range of topics related to the mineralogy of noble metals (Au, Ag, Pt, Pd, Rh, and Ru) and the occurrence, formation, and distribution of these elements in natural ore-forming systems. This collection of eleven research articles discusses various problems related to these topics. I hope this Special Issue will contribute to a better understanding of the genesis of gold, silver, and other noble metal deposits as well as the behavior of these elements in endogenic and supergene environments, and suggest ways forward to solving the problem of their full extraction from ores.

gold selenide --- gold sulfoselenide --- colloids --- nanoparticles --- nucleation --- liquid intermediates --- deposition --- XPS --- sulfide minerals --- platinum --- deposition --- valleriite --- chloride complexes --- zircon U–Pb age --- in situ sulfur isotopes --- gold source --- ore genesis --- Chaoyangzhai gold deposit --- Southeast Guizhou --- mineralization age --- Nibao gold deposit --- ore-forming fluid --- Rb–Sr isotopic composition --- Yunnan–Guizhou–Guangxi “Golden Triangle” region --- Gaching ore deposit --- mustard gold --- calaverite --- maletoyvayamite --- Fe-Sb(Te,As,Se,S)-oxides --- Au-Sb(Te,Se,S,As)-oxides --- Cu-Fe-Ni-S system --- platinum-group elements --- Au --- Ag --- metalloid elements --- fractional crystallization --- drop-shaped inclusions --- noble metals --- invisible species --- distribution --- pyrite --- arsenopyrite --- structural and surficial modes --- arsenopyrite --- crystal lattice --- ligand surroundings --- non-equal positions --- Mössbauer Effect --- gold --- “invisible” gold --- gold ore deposits --- Kagan ultramafic massif --- Southern Urals --- antigorite serpentinites --- magnetite veins --- gold mineralization --- native gold --- thermodynamic modeling --- fluid regime --- Fennoscandian Shield --- Kolmozero–Voronya belt --- Oleninskoe deposit --- mustard gold --- dyscrasite --- chlorargyrite --- gold ore field --- karst cavities --- monolithic and porous gold --- Tl oxides (avicennite) --- Tl carbonates --- Tl tellurates and antimonates --- n/a