Solid solutions involving natural Mn3+O(OH) polymorphs, groutite, manganite, and feitknechtite are characterized discussed based on original literature data the chemical composition, powder single-crystal X-ray diffraction, middle-range IR absorption spectra of these minerals. It is shown that manganite forms two kinds solid-solution series, in which intermediate members have general formulae (...

amygdaloidal, cavity- and fracture-filling zeolites in eocene volcanic rocks from the kuh-e-aradeh of southern kahrizak, in the northernmost part of central iran have been studied in some detail by optical, chemical analysis, sem, and xrd techniques. the zeolites identified, in order of their relative time of formation from early to late, are tetranatrolite, analcime, natrolite, mesolite, stilb...

Standard partial molal thermodynamic parameters for the aqueous chlorinated-ethylene species, perchloroethylene (PCE), trichloroethylene (TCE), 1,1-dichloroethylene (1,1-DCE), cis-1,2-dichloroethylene (cis-1,2-DCE), trans-1,2-dichloroethylene (trans-1,2,-DCE), and vinyl chloride (VC) have been estimated by using experimental gas-solubility data and correlation algorithms. The provided thermodyn...

We present a first-principles investigation of the structural, electronic, and magnetic properties pyrolusite ($\beta$-MnO$_2$) using conventional extended Hubbard-corrected density-functional theory (DFT+$U$ DFT+$U$+$V$). The onsite $U$ intersite $V$ Hubbard parameters are computed linear-response in framework perturbation theory. show that while inclusion is crucial to describe localized natu...

The purpose of this study is to determine geochemical anomalies on lithogeochemical data from Ardestan area, Central Iran, using concentration-number (C-N) fractal modeling and staged factor analysis. Staged factor analysis is used to the recognition of genetic correlation and elimination of non-indicator elements in three steps. Factor scores of elements were calculated and geochemical data cl...

Amygdaloidal, cavity- and fracture-filling zeolites in Eocene volcanic rocks from the Kuh-e-Aradeh of southern Kahrizak, in the northernmost part of Central Iran have been studied in some detail by optical, chemical analysis, SEM, and XRD techniques. The zeolites identified, in order of their relative time of formation from early to late, are tetranatrolite, analcime, natrolite, mesolite, stilb...

<p class="AbstractHeading">Bijih mangan merupakan bahan galian yang banyak terdapat di kabupaten TTU. Proses penambangan desa Oetalus-TTU hingga saat ini masih dilakukan secara tradisional oleh masyarakat tanpa mengetahui pola penyebaran bijih mangan. Harga jual pun tergolong rendah karena tidak ada informasi kepada mengenai kualitas Oleh itu, penelitian untuk identifikasi lokasi Oetalus ...