background: high density concrete is extensively used for efficient radiation attenuation in radiotherapy rooms and nuclear reactors. over the past eight years, some efficient galena-based concrete samples for shielding x or gamma rays was produced. the goal of this study was to produce a novel high density concrete against neutron and photon radiations using tourmaline and galena. materials an...

Abstract. Tourmaline crystals from the island of Elba commonly display a sharp transition to dark colors at analogous termination due incorporation Fe and/or Mn during latest stages crystallization in pegmatites. The formation such color anomalies is related dramatic physicochemical change environment as consequence an opening geochemical system. However, mechanisms that may lead availability r...

Abstract. The OH-stretching infrared absorption spectrum of a tourmaline sample close to the foitite end-member is interpreted in light density functional theory (DFT) modeling iron-bearing Y3Z6 clusters tourmaline. reflect Al-rich and Na-deficient character contain either two Fe2+ one Al3+ or ions at Y sites. are embedded host structure with dravite composition. For iron dimer models, structur...

Infrared spectra (IR) in the O-H stretching region were recorded for natural tourmalines from magmatic and magmatic-hydrothermal systems of Moslavacka Gora (Croatia). Samples disseminated tourmaline (schorl) representing products collected leucogranite. Nodular (intermediate members schorl-dravite series) twomica granite represents a mineral related to final stage crystallization. IR typically ...