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marcasite

sciences naturelles et appliquées - iate.europa.eu

Ces couches centrales et de guidage sont constituées de semi-conducteur d'une structure cristalline de marcasite de plomb.

The core and guide layers are made of semiconductor of lead marcasite crystal structure.

sciences naturelles et appliquées - wipo.int

se trouve que les fronts rouler dans le grès éocènes de la Formation Wind River, comme l'uraninite avec de la pyrite, marcasite, hématite, calcite, et la matière organique.

The ore occurs as roll fronts in Eocene sandstone of the Wind River Formation, as uraninite with pyrite, marcasite, hematite, calcite, and organic matter.

général - CCMatrix (Wikipedia + CommonCrawl)

Constitués principalement de sulfures de fer (pyrite, marcasite, pyrrhotite), ils contiennent des quantités variables de sulfures de métaux (cuivre, plomb, zinc) et sont parfois riches en or.

Composed mainly of iron sulphides (pyrite, marcasite, pyrrhotite), they contain variable amounts of base metal sulphides (Cu, Pb, Zn); some can be rich in gold.

général - CCMatrix (Wikipedia + CommonCrawl)

À partir des telles caractérisations, des minerais acidogènes (par ex., la pyrite, la marcasite, la pyrrhotite) et des minerais neutralisateurs des acides (par ex., la calcite, la dolomite) peuvent être quantifiés.

From such characterisations, acid generating minerals (e.g. pyrite, marcasite, pyrrhotite) and acid neutralising minerals (e.g. calcite, dolomite) can be quantified.

général - CCMatrix (Wikipedia + CommonCrawl)

Constitués principalement de sulfures de fer (pyrite, marcasite, pyrrhotite), ils contiennent des quantités variables de sulfures de métaux de base (Cu, Pb, Zn) ; certains peuvent être riches en or.

Composed mainly of iron sulphides (pyrite, marcasite, pyrrhotite), they contain variable amounts of base metal sulphides (Cu, Pb, Zn); some can be rich in gold.

général - CCMatrix (Wikipedia + CommonCrawl)

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L'indice à sulfoantimoniures de plomb des cougnasses (commune d'orpierre, hautes-alpes). partie ii. étude paragénétique

...la plus fréquente : boulangérite initiale, puis chalcopyrite (+ galène et blende) → tétraédrite → bournonite + andorite˗ramdohrite, et, pour les sulfures de fer : mispickel → marcasite → pyrite....

...Paragenetic analysis of ore from Cougnasses occurence has permitted to distinguish two principal phases : — phase I, with iron carbonates (initial), present a Pb/Sb ratio regularly increasing : • first stade : zinkenite + quartz, • second stade : plagionite → semseyite (+ bournonite) → geocronite → galena, with sphalerite terminal ; — phase II, with baryte (initial) and calcite (terminal), show as dominant succession : boulangérite first, then chalcopyrite (+ galena and sphalerite) → tetrahedrite → bournonite + andorite, and, for iron sulphides : arsenopyrite marcasite → pyrite....

général - core.ac.uk -

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Observations nouvelles sur les sulfures néogènes des sources thermales de bourbonne-les-bains...présence déjà signalée par Daubrée en 1875 de : chalcocite, bornite, chalcopyrite, covellite et tétraédrite et d'y déceler d'autres espèces : blende, digénite, galène, idaïte, marcasite, polybasite, stromeyerite, wurtzite....

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Epitaxial marcasite on pyrite from rensselaer ' indianaEpitaxial overgrowths of marcasite on euhedral pyrite occur in petroleum-fi l led cavities within a northwestern Indiana dolostone quarry....

général - core.ac.uk -général - core.ac.uk - PDF: rruff.info

Étude métallographique des minerais de příbram (tchécoslovaquie)... Ce sont les minéraux suivants : arsenic, allemontite, bismuth, or, argent, stibine, blende, wurtzite, nickélite, mauchérite, millérite, pyrrhotite, galène, argyrite, chalcocite, pyrite, marcasite, chloantite, mispickel, glaucodot, löllingite, rammelsbergite, safflorite, chalcopyrite, bornite, linnéite, sternbergite, pyrargyrite, berthiérite, boulangérite, diaphorite,...

High pressure synthesis of marcasite-type rhodiumpernitrideMarcasite-typerhodium nitride was successfully synthesized in a direct chemicalreaction between a rhodium metal and molecular nitrogen at 43.2...

PDF: figshare.com

Analyse thermique différentielle des minerais sulfurés... : pyrite, blende, galène, marcasite....

Heat capacities of iron disulfides thermodynamics of marcasite from 5 to 700 k, pyrite from 300 to 780 k, and the transformation of marcasite to pyriteThe heat capacity of purified natural marcasite has been determined by adiabatic-shield calorimetry in the region 5 to 700 K where it transforms to pyrite exothermically....

PDF: hdl.handle.net

Practical application of the revolutionary preservation (rp) system ® for marcasiteThe marcasite specimens at the Milwaukee Public Museum were re-housed in microenvironments to improve storage conditions that contributed to their chemical and physical degradation....

PDF: www.keepsafe.ca

The geochemistry of gold-bearing and gold-free pyrite and marcasite from the getchell gold deposit, humboldt county, nevadaPetrographic and geochemical investigations of pyrite and marcasite from the Getchell Carlin-type gold deposit show that elevated concentrations of a characteristic suite of trace metals correlate with ore-stage pyrite morphology....

PDF: digitalscholarship.unlv.edu

Publications scientifiques

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Éléments traces associés aux kaolinites des charentes

...

... The argillaceous fraction is accompanied at Montroux by centimetric nodules of pyrite, marcasite and chalcopyrite, and at St....

général - core.ac.uk -

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La spectroradiométrie, outil d'étude des impacts des rejets miniers sur l'environnement: application aux rejets de la mine de jalta (tunisie)

...International audienceThe mine of Jalta (exploited from 1900 to 1986) is located 83km from Tunis city in the North -Western part of Tunisia. Large dumps result from the accumulation of solid mining wastes after the processing of the Pb-Zn ore within the borders of the mining area. Exposed to different meteoric factors, sulphides from the tailings dams and wastes are oxidized thus generating acid mining drainage (AMD) capable to mobilize and release heavy metals associated to sulphides. In this survey, the impact of these mining wastes on the environment has been controlled for the first time in Tunisia by means of spectroradiometry. This work is based on the identification of characteristic spectral absorption features of each mineral in view of the mineralogical characterization of the mineral surfaces in the study area from their spectroradiometric measurements. The different absorption features of mineral surfaces studied in this paper either overlap or are poorly visible. It is hence necessary to find means to enhance them and therefore to differentiate them. The second derivative of spectral curves enables the achievement of this objective (Brasset, 1995)....

général - core.ac.uk - PDF: hal.archives-ouvertes.fr

Synonymes et termes associés français

marcassite

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