AMCSD Search Results
Columbite-(Fe) Tarantino S C, Zema M: American Mineralogist 90 (2005) 1291-1300: Mixing and ordering behavior in manganocolumbite-ferrocolumbite solid solution: A single-crystal X-ray diffraction study: Sample: BRA n3 Qm=1 from S. Jose de Safira, Minas Gerais, Brazil _database_code_amcsd 0003847: 14.2877 5.7363 5.0561 90 90 90 Pbcn
Tantalum
Since tantalum is so resistant to corrosion, it is used to make surgical instruments and medical equipment such as rods to attach to broken bones, skull plates, and wire meshes to help repair nerves and muscles. Tantalum is also used in camera lenses. Return to Minerals Database. Tantalum (Ta) has a very high melting point (2996°C), exceeded ...
Columbite-(Fe): Mineral information, data and localities.
Columbite-(Fe)-Tantalite-(Fe) Series and the Columbite-(Fe)-Columbite-(Mn) Series. Formerly known as columbite and ferrocolumbite. ... Bordet P, McHale A, Santoro A, Roth R (1986) Powder neutron diffraction study of ZrTiO4, Zr5Ti7O24 and FeNb2O6 _cod_database_code 1008356 Journal of Solid State Chemistry 64 30-46:
The Surface Structure Change of Columbite-(Fe
The columbite minerals ((Fe, Mn) (Ta, Nb)2O6) [4] group was the most common Nb-Ta species compound with other metal elements, which mainly included the members of columbite-(Fe) (FeNb2O6) and ...
Columbite Group: Mineral information, data and …
Columbite-(Fe) Bordet P, McHale A, Santoro A, Roth R (1986) Powder neutron diffraction study of ZrTiO4, Zr5Ti7O24 and FeNb2O6 _cod_database_code 1008356 Journal of …
Extractive metallurgy of columbite-tantalite ore: A detailed …
The increased demand of metals such as tantalum (Ta) and niobium (Nb) reflect the on-going development in modern science, engineering and technology. The extraction of these two metals from columbite-tantalite ore is based on generic extractive metallurgy. However, the upstream purification of ore and downstream extraction of Ta …
Columbite | Geology Page
Columbite, also called niobite, niobite-tantalite and columbate [ (Fe, Mn)Nb 2 O 6 ], is a black mineral group that is an ore of niobium. It has a submetallic luster and a high density and is a niobate of …
U-Pb isotopic dating of columbite-tantalite minerals: Development of
Our study has two objectives: i) establish a database of reference materials for in situ U-Pb isotopic dating of columbite-tantalite minerals and ii) test the capability of SIMS to in situ U-Pb date columbite-tantalite minerals of different chemical composition. ... (Mn + Fe) columbite-tantalite diagram. Group II includes samples NP2 and NT-2 ...
Can the provenance of the conflict minerals columbite and …
Conflict minerals is a term applied to ores mined in conditions of armed conflict and human rights abuse. Niobium and tantalum are two rare metals whose primary natural occurrence is in the complex oxide minerals columbite and tantalite, the ore of which is commonly referred to as coltan. The illicit export of coltan ore from the …
Interfacial Structure Change and Selective Dissolution of Columbite–(Fe …
The goal of the paper is to study the charge transfer and reactions at the columbite-(Fe) (FeNb2O6) mineral surface during the HF leaching process. In this paper, X-ray photoelectron spectroscopy (XPS), leaching experiments, and density functional theory (DFT) calculations were used to study the surface element adsorption, charge …
Columbite-(Mn) Mineral Data
Columbite-(Mn) Plumbopyrochlore Comments: Yellow-brown plumbopyrochlore crystalline crust over black manganocolumbite grain.Such plumbopyrochlore-manganocolumbite ovoids with different grade of replacement are very typical for the locality. Location: Amazonite pegmatites of Ploskaya Mt, Western Keivy Massif, Kola Peninsula, …
American Mineralogist Crystal Structure Database
Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation. Should the use of the database require a citation, then please use: Downs, R.T. and Hall-Wallace, M. (2003) The American Mineralogist Crystal Structure ...
Mineralogy and chemistry of columbite-tantalite from …
(1) Fe can be sourced from the melt reaction with Fe-bearing primary phases within the pegmatite, (2) as the result of a melt interaction with country-rocks, (3) due to infiltration of hydrothermal fluids before or after thermal equilibration of pegmatites with their host rocks, and (4) Fe evolution may be controlled by columbite-tantalite ...
Towards sustainable processing of columbite group …
Columbite group minerals (CGM) are the main source for the production of niobium and tantalum metals. ... The diffraction data compares well with ICDD refs. 04–012Ta 0.1 Nb 1.90 Mn 0.21 Fe 0.79 ...
Dmitryvarlamovite, Ti2(Fe3+Nb)O8, a new columbite …
Introduction. The new mineral dmitryvarlamovite, Ti 2 (Fe 3+ Nb)O 8, described in this paper, is related to the wolframite group which belongs to the columbite supergroup whose systematics and nomenclature have been approved recently (Chukanov et al., Reference Chukanov, Pasero, Aksenov, Britvin, Zubkova, Yike and Witzke …
Columbite Supergroup: Mineral information, data …
The columbite supergroup includes 39 oxide minerals based on the general stoichiometry M:O = 1:2 and structurally characterized by zig-zag chains of edge-sharing metal-oxygen …
Columbite-(Mn): Mineral information, data and localities.
Originally referred to as manganocolumbite, it was changed to the current form in 2008 (Burke 2008). The name refers to the relationship to the other columbite group species, with dominant manganese. The columbite group name refers to columbium, an old name for the element niobium. Member of binary Columbite- (Fe)-Columbite- (Mn) Series and ...
Detail mineralogical study and geochronological framework …
Columbite-(Fe) (Clb1-I up to 100 μm), minor pyrochlore (10 μm) and aeschynite (10 ∼ 20 μm) ... AMICS automatically compared the measured BSE and EDS data of each different phase with the database to distinguish their mineral phases and compute mineral abundances. Finally, mineral maps of a thin section surface were …
Columbite-(Fe)
SOURCE. LOCALITY. OPTIONS. Columbite- (Fe) R050348. Fe 2+ Nb 2 O 6. California Institute of Technology. Lord Hill mine, Stoneham, Oxford County, Maine, USA.
Mineral chemistry of columbite–tantalite from
Columbite-group minerals (CGM), whose simplified formula can be expressed as [A] (Fe,Mn) [B] (Nb,Ta) 2 O 6 crystallized in all main stages of the pegmatite evolution, thus allowing us to trace the evolution of the pegmatite system on the basis of variations in mineral chemistry of these CGM. 2. Geological setting of the Kolmozero deposit
Columbite-(Mn): Mineral information, data and localities.
Member of binary Columbite-(Fe)-Columbite-(Mn) Series and Columbite-(Mn)-Tantalite-(Mn) Series. ... No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care. References for Columbite-(Mn)Hide Reference List: Sort by Year ...
Columbite-(Fe) R060001
Name: Columbite-(Fe) RRUFF ID: R060001 Ideal Chemistry: Fe 2+ Nb 2 O 6 Locality: Gypsy mine, Minas Gerais, Brazil Source: Eric Van Valkenburg Owner: RRUFF Description: Steel gray fragment with internal red hints Status: The identification of this mineral has been confirmed by X-ray diffraction and chemical analysis Mineral Group: [ Columbite (32)] …
(PDF) Secondary Recovery of Columbite from Tailing …
This study also provided database for optimum recovery of columbite from tailings of mining sites of similar composition. See Full PDF Download PDF. See Full PDF Download PDF. ... A concentrate assaying 65.66 % Fe and 0.38 % K2O+Na2O was obtained with 78.11 % recovery by wet magnetic separation. It was concluded that concentrates …
Age of the Dahongliutan rare metal pegmatite deposit, …
Columbite-(Fe) (with high U and low Th) yielded a Late Triassic weighted mean 206 Pb/ 238 U age of 211.9 ± 2.4 Ma, whilst cassiterite yielded a 206 Pb/ 238 U– 207 Pb/ 235 U concordia lower intercept age of 218 ± 12 Ma and a Tera-Wasserburg lower intercept age of 218 ± 12 Ma, which is identical to the columbite-(Fe) U-Pb age and thus ...
Mineralatlas Lexikon
- An insight into crystal chemistry and cation order of columbite-(Fe) and columbite-(Mn) from worldwide occurrences. Neues Jahrbuch für Mineralogie - Abhandlungen, 192 (2015), 275–287. IMA group assignments
Columbite-(Fe): Mineral information, data and …
Zimbabwe Geological Survey, Mineral Resources Survey No. 4. Mineral and/or Locality. Columbite- (Fe)-Tantalite- (Fe) Series and the Columbite- (Fe)-Columbite- (Mn) …
Columbite supergroup of minerals: nomenclature and …
The columbite–tantalite-series minerals are columbite-(Fe), and their paragenesis evolves from composite grains with pyrochlore to individual crystals. Pyrochlore is magmatic with U–Ta–Ti ...
Columbite-(Fe) Mineral Data
Columbite- (Fe) Mineral Data. General Columbite- (Fe) Information. Chemical Formula: Fe++Nb2O6. Composition: Molecular Weight = 337.66 gm. Niobium 55.03 % Nb 78.72 …
Columbite-(Fe)-Tantalite-(Fe) Series: Mineral information, …
Columbite-(Fe)-Tantalite-(Fe) Series mineral data, information about Columbite-(Fe)-Tantalite-(Fe) Series, its properties and worldwide locations. ... No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care. References for Columbite-(Fe)-Tantalite-(Fe) SeriesHide
Thorium-poor monazite and columbite-(Fe) mineralization …
Niobium mineralization is commonly represented by anhedral minerals of columbite-(Fe) which occur closely associated with magnetite-hematite and host up to 78 wt% Nb2O5, 7 wt% Ta2O5 and 1.6 wt% Sc2O3.
