LCT-granitic pegmatites as defined by (Cerny, 1991) are anomalously enriched in Li, Rb, Cs, Be, Sn, Ga, Ta>Nb, (B,P,F) and are host to many of the worlds most precious gemstones including emerald, chrysoberyl and topaz (Minas Gerais, Brazil), sapphire and ruby (Afghanistan and Pakistan), and gem tourmaline (Pala District, California). Twelve Minfile (MF) occurrences of LCT-pegmatites are record...

effect of different concentrations of ammonium chloride (ncl) and ammonium nitrate (nn)and surfactants such as tween-80, hpcd and rhamnolipids on the bioremediation of pahs and ocps wasinvestigated. the results showed that the best optimum concentration of ncl and nn was 50 g·kg-1, and thepahs degradation rate during 60 days of remediation was enhanced to 64.6% and 62.8% for ncl and nn,respecti...

A thick succession of sedimentary rocks belonging to Tipam Group is well exposed all along the road cut sections near Buhchang village, Kolasib district, Mizoram. The heavy mineral suite of the Tipam sediments depicts a cosmopolitan nature. It comprises dominantly of non-opaque variety that includes zircon, tourmaline, rutile, staurolite, kyanite, sillimanite, apatite, epidote, garnet and hornb...

The Dachang Sn-polymetallic ore district in South China is the second largest tin world with a reserve of over one million tonnes. Zn-Cu skarn and stratiform, massive, vein Sn-Pb-Zn ores are all present this district. This has led to debate as whether Sn orebodies were formed by Cretaceous magmatic-hydrothermal replacement or Devonian submarine exhalative-hydrothermal sedimentation. Here, we sy...

Tourmaline can be found as an accessory mineral in a variety of rocks including leucogranite, pegmatite, quartz veins, and metamorphiccountry rocks in Hajiabad-Dehgah area in SE of Boroujerd city. Tourmaline in pegmatites is coarse-grained, subhedral to euhedral, anddisplays strong to moderate pleochroic blue rimmed by olive green. In contrast, tourmalines from leucogranite, quartz-veins, and h...

Brewster (1830a) points out that beautiful color effects will be seen if metallic salts are allowed to crystallize from solution under a microscope in polarized light. For this he recommends a glass-plate polarizer and a thin plate of agate or tourmaline as analyzer. The first one to equip a microscope with Nicol prisms was probably Talbot (1834a, 1837) who describes various observations with t...