The chemical formula of mineral Demartinite is indicated by K2[SiF6]. The first specimen of this mineral was collected in April 2006 from a fumarole at the crater rim. This mineral is polymorphous with hieratite. Demartinite is commonly found occurring from its type of locality at La Fossa crater, Vulcano, Eolian Islands, Italy. Demartinite was named for Francesco Demartin (b. 1953), who has made significant contributions to the chemistry of metallic clusters and to the crystal structure of Alpine rare-earth minerals and uranium minerals. Demartinite is known to crystallize in the hexagonal system of crystal formation. In optical mineralogy, the hexagonal system of crystallization comprises crystals having four axes. Three of which are positioned in a single plane with equal length and are symmetrically spaced. The fourth axis is found to be perpendicular to the other three axes. This mineral is commonly found colorless in hand sample. The density measure of mineral Demartinite is commonly found 2.85 grams per cubic centimeters. Most crystals are found transparent in appearance. The crystal habit of mineral Demartinite as described in the field of optical mineralogy usually includes hexagonal form with six-sided crystal shape in cross-section or habit. It can be found showing vitreous or glassy luster in reflected light of polarizing microscope for mineralogists. Demartinite is also found leaving a white streak when rubbed on white porcelain streak plate. This mineral is found showing uniaxial negative figure with 0.0100 birefringence when specimen is evaluated using the Mohs scale method. Demartinite is known to have barely detectable radioactivity when chemically evaluated.
Tuesday, January 31st, 2012 at 5:02 am
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