Andranondambo Sapphire discovery ( Madagascar )

Written by Alain Darbellay GGGems


Continued from page 1
formations have only a very weak development. It is necessary to quoterepparttar alluvial plains of Androtsy, Esira, Sangoria and Pisopiso. A notable calcareous carapace covers most ofrepparttar 109299 area. Metamorphized dolomitic limestone. Near Andranondambo The anosyans granites are regarded as synorogenes, eocambrians formed inrepparttar 109300 androyans series to which an age higher than 2400 MY is allotted. The esirians granites present very variable crushings of intensity which often give them a gneissic facies . There is sometimes passage to orthogneisses. General foliation is sub meridian. The occurrences ofrepparttar 109301 Andranondambo area were industrially exploited since 1993 and have been almost abandoned few years later. Actually, it is very difficult to exploit sapphire direct in mother rock, because corundum is not concentrated enough. Furthermore,repparttar 109302 hardness ofrepparttar 109303 rock makes its exploitation very expensive. MADAGASCAR GEM SAFARI ABOUT ILAKAKA MADAGASCAN CORUNDUMS

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Pakistan gem safari

Written by Alain Darbellay GGGems


Continued from page 1
deposit of natural cherry topaz inrepparttar world. -------------------------------------------------- Emerald from Mingora,repparttar 109298 main city of Swat. The deposit discovered in 1958 was closured and monopolized byrepparttar 109299 government, it is what compelled certain inhabitants residing inrepparttar 109300 neighborhood to dig under their house in order to researchrepparttar 109301 prohibited treasure. TECTONIC CONTROL OVER EMERALD MINERALIZATION IN SWAT. It is inrepparttar 109302 Swat valley that Alexander of Macedon fought Emerald and chromian tourmaline occur in carbonate-talc/ and won some of his major battles before crossing over serpentine/chlorite rocks, carbonate-bearing talc schists, torepparttar 109303 plain of Pakistan. and associated quartz veins near Mingora, Charbagh, and Let us note thatrepparttar 109304 emerald was known for a long time Shangla. The rocks are altered ultramafics found in a in this valley, thanks to an analysis on a stone of a discontinuous belt of volcanic, volcano-sedimentary, and Gallo-Roman ear-ring, witch shown that this emerald sedimentary rocks that have undergone high P-low T originated in ofrepparttar 109305 mines located inrepparttar 109306 Swat valley. metamorphism. This thanks torepparttar 109307 measurement ofrepparttar 109308 report/ratio of

This is atrepparttar 109309 occasion of one of our visits inrepparttar 109310 valley, that some children tolled us that they found some fragments of emerald inrepparttar 109311 Swat river. concentration ofrepparttar 109312 isotopes 18O and 16O. Indeed,repparttar 109313 isotopic composition out of oxygen of this precious stone is dependent on that ofrepparttar 109314 rock where it crystallized. Central street of Mingora. ------------------------------------------------- Blue-green tourmaline from Kunar valley, Afghanistan. Nimak mendy, old Peshawar, onrepparttar 109315 road to Afghanistan. Mountains of Afghanistan. Alain talking with our Afghan friend Sarbaz. GGGEMS.COM

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