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- Title
The Rietveld Structure Refinement of the Marcasite Crystals from Herja Ore Deposit Using X-ray Powder Diffraction Data.
- Authors
Brănoiu, Gheorghe; Georgescu, Octavian
- Abstract
The crystal structure of marcasite sampled from Herja ore deposit (Maramures region, Romania) has been refined using X-Ray powder diffraction data and the Rietveld method. Marcasite is the metastable dimorph of FeS2 crystallized in the orthorhombic system, and rapidly inverts to pyrite when is heated above 500°C. Genetically, marcasite appears under low-temperature conditions, both in sedimentary rocks and in hydrothermal veins. The Rietveld refinements were carried out using the computer program Topas 4.1 (Bruker-AXS). Pseudo-Voigt (pV) profile function was used for the fit of the peaks. Rietveld refinement using X-Ray powder diffraction data of marcasite crystals in space group Pnnm (No.58), a=4.4339Å, b=5.3887Å, c=3.3620Å (2-sigma=0.0037), Z=2, confirm the basic marcasite structure.
- Subjects
MARAMURES (Romania : Judet); RIETVELD refinement; MARCASITE; CRYSTAL structure; ORE deposits; X-ray powder diffraction
- Publication
Petroleum - Gas University of Ploiesti Bulletin, Technical Series, 2014, Vol 66, Issue 2, p13
- ISSN
1224-8495
- Publication type
Article