Andranondambo Sapphire discovery ( Madagascar )Written by Alain Darbellay GGGems
© 2004 gggems.com All rights reserved. Tranomaro in 1991 >> Geographical division We will distinguish: 1 volcanic solid mass of Androy, it is covered with thorny bush and meadows. 2 gneissic zone of to Mandrarean Androy, fields plains and hills, rare zones of savanna on of red ground At time calcareous carapace. of great Altitude varies there from dryness in 600 meters on hills south. to 250 meters at bottom. 3 western slope of high Anosyans chains which tops are staged between 1500 and 2000 meters. It is a field of meadows. Geological divisions. 1 Crystalline schists. Gneiss with diopside, syenitic eysies gneisses, arteritic injections, gneiss at cordierite, etc. 2 Old eruptive rocks. Pegmatites, Dissogénites, Esirians granites , charnockites, kalambatreans granites, late granites . 3 Recent eruptive rocks. (Volcanic solid mass of Androy) a) A base, a thick basaltic subhorizontale series . b) Basaltic dykes. On road to Andranondambo c) A thick higher subhorizontale rhyolitic series. d) Rhyolitic dykes . 4 Recent formations. If russet-red sands are excluded, recent
| | Pakistan gem safariWritten by Alain Darbellay GGGems
© 2004 gggems.com All rights reserved. PAKISTAN Tourmaline from Estaknala, located at foot of Haramosh mount, 7 kms from Sassi. (Between Gilgit and Skardu) The Northern areas conceals treasures, such of rubies, emeralds, sapphires, aquamarines, topazes, tourmalines etc. Unfortunately, their extraction directly in mother-rock, makes exploitation very difficult. Emeralds from Sassi found in a limestone. A gravel-top 241 kms road track connects Gilgit to Skardu, capital of Baltistan perched 2438 meters above sea level. The journey takes 6 to 8 hours. Sassi is located at edge of this road, in geological belt made up amongst other things of amphibolites surrounding Nanga Parbat, one of famous peaks of Himalayas. In Sassi, life is hard, but inhabitants are friendly. At an elevation of 1,454 meters lies Gilgit. This wood bridge is one of longest of The Rakaposhi Volcanic Complex previously called greenstone complex covers a large part of Hunza Valley.Four main lithological elements comprising whole mass: 1 basalt-andesite-dacite-rhyodacite to rhyolite. 2 greenschists, actinolite,chlorite schists, hornblend schist, amphibolite and agglomerates 3 Medium crystalline limestone and marble, quartzite, chert, slates and micaschist. 4 The igneous intrusions are mostly in form of acid and basic sills and dykes. Leucocratic granites bodies are quite common Himalayas. Rakaposhi overview from Haliabad. · Valley of Hunza. Situated at an elevation of 2,438 meters, Hunza Valley is spot of famous rubies found in a metamorphic limestone, said:( Ganesh marble.) -------------------------------------------------- Topaz from Dasso ( Shigar.) · Shigar valley is gateway to great mountain peaks of Karakorams, Gasherbrum peak & K-2. -------------------------------------------------- Cherry topaz from Mardan ( natural coulour.) · Mardan, on road to Swat conceals only
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