Results 101 to 110 of about 93,816 (310)
Leaching of pyrite in cupric chloride solution
E3S Web of Conferences, 2016 Pyrite (FeS2) is the most abundant sulphide mineral in the world and may contain significant amounts of gold locked in its structure. Traditionally, pyrite has to be oxidized in order to break down the mineral matrix for better gold liberation by e.g ...
Elomaa Heini, Lundström Mari
doaj +1 more source
Small Structures, EarlyView.This study uses nanocellulose crystals (NCCs) as the precursor for graphene production. The NCCs are pyrolyzed at 500–800 °C and then converted to graphene in the vortex fluidic device using only water as the solvent. The graphene shows a relatively high quality and TEM confirming <6 layers.
Yu Matsueda +2 more
wiley +1 more source
Evidence of microbial activity from a shallow water whale fall (Voghera, northern Italy) [PDF]
, 2012 The fossil bones, associated carbonate cements and enclosing concretion of a Miocene mysticete from inner shelf deposits (Monte Vallassa Formation, northern Italy) were analyzed for evidence of microbial activity. Optical and scanning electron microscopy,
Cavalazzi, B +5 more
core +4 more sources
Common misconceptions in crystallography and crystal optics
Journal of Applied Crystallography, EarlyView.Six recurrent misconceptions in crystallography, some involving mineral and crystal optics, are analyzed and discussed. The explanation of these and similar misconceptions could serve as educational resources for teachers.Did you know that an X‐ray diffraction pattern is not a spectrum?
Lluís Casas
wiley +1 more source
Литосфера, 2018 Object . The zonal pyrite nodules and metacrystals from siliceous siltstones of ore-bearing horizon of the Second ore body from the Yubileynoe massive sulfide deposit are studied. Materials and methods .
Alexander S. Tseluyko +2 more
doaj +1 more source
Archaeometry, EarlyView.ABSTRACT Twelve metal artifacts from recent excavations at the Sasanian archaeological site of Jahāngir in western Iran have been analyzed. These items include both decorative and utilitarian artifacts. The samples were examined using micro‐X‐ray fluorescence (μ‐XRF), scanning electron microscopy with energy‐dispersive X‐ray spectroscopy (SEM‐EDS), and
Omid Oudbashi +2 more
wiley +1 more source
Occurrence and distribution of barite in the permo-triassic siksikpuk formation along the Brooks Range haul road [PDF]
, 1980 Barite commonly occurs in Permian to Triassic age rocks along the north flank of the Brooks Range. The Siksikpuk Formation (Wolfcampian to lowest Guadalupian age) is noted for its barite and is well exposed in the vicinity of Galbraith Lake along the ...
Payne, M.W.
core
Evidence for an impact-induced biosphere from the δ34S signature of sulphides in the Rochechouart impact structure, France [PDF]
, 2017 The highly eroded 23 km diameter Rochechouart impact structure, France, has extensive evidence for post-impact hydrothermal alteration and sulphide mineralization.
Boyce, A.J. +4 more
core +1 more source
Leaching of Pyrite by Acidophilic Heterotrophic Iron-Oxidizing Bacteria in Pure and Mixed Cultures [PDF]
, 1999 Paula Bacelar Nicolau, D. Barrie Johnson
openalex +1 more source
Archaeometry, EarlyView.ABSTRACT The hillfort of Castrejón de Capote is one of the best investigated settlements of Late Iron Age southwest Iberia. Located in the territory that the classical sources attributed to the Celtici, it was occupied between the early 4th and the 1st centuries bce.
Beatrijs de Groot +2 more
wiley +1 more source