 | | Book | | the Mombasa Basin and at the western rim of the Mandera Basin in northeastern Kenya. In the Mombasa Basin...Karoo sediments occur at the western rim of the Mandera Basin. These strata are known as the Mansa Guda...continental to marine facies conditions, in the Mandera Basin in northeast Kenya the underlying Precambrian...surface of an undulating relief. The Jurassic in the Mandera Basin has been subdivided in ascending order into...Dakacha Formation (Kimmeridgian - Tithonian?) and Mandera Formation (Tithonian). Most of these formations |  | | Book (edition) | | largest crystals are opaque some gem-quality aquamarine and topaz crystals can weigh many kilograms....and tanzanite. Gem minerals such as amethyst, aquamarine, morganite, topaz and tourmaline may be found... Madagascar and Sri Lanka, almandine garnet, aquamarine, chrysoberyl, ruby, sapphire, spinel, topaz,...The valley is well known as a source of fine aquamarine and chrysoberyl The first mechanized mining...(c) pink beryl, (d) aquamarine Montana are short prismatic in habit. Aquamarine is usually found as |  | | Journal (volume) | | Uganda Tanganyika . Northern Rhodesia Nyasaland . Somaliland . Bechuanaland Swaziland Federation of Nigeria...V Plate VI Strongly Jointed Gneisses, British Somaliland Outcrop of Manganese Ore, Fiji Plate VII Anorthosites...Tanganyika 55 Northern Rhodesia 59 Nyasaland 60 Somaliland . 62 Bechuanaland 63 Swaziland 64 Nigeria...Tanganyika Strongly Jointed Gneisses, British Somaliland 57 57 Outcrop of Manganese Ore , Fiji ix This...geological mapping of the Basement rocks continued in Somaliland, and satisfactory results were obtained also |  | | Journal (volume) | | this group were once opal, turquoise, garnet, aquamarine, jade, moonstone, and amethyst and other forms...gemstone is often used to imitate the precious aquamarine gemstone. Imitation diamond Colourless topaz...similar in appearance to the more valuable gemstone aquamarine. Although natural radiation may take millions...are not. Just as topaz can be made to resemble aquamarine, so the red of proustite can be deepened by heat...artificially by radiation techniques. Blue beryl (aquamarine), for instance, can have its blueness enhanced |  | | Journal (issue) | | quantities. Gems found in Madagascar include aquamarine, beryl and tourmaline, together with columbite...to be exploited. The main supplies lie in the Mandera Basin in the northeast and offshore by the Lamu |  | | Book (volume) | | and flanks replaced with deep greenishblue or aquamarine (often appears darker in field), or light greyish...forehead, supercilium, chin and throat, deep aquamarine-blue crown, face and upperparts to mantle and...forehead. Female is similar to male but has duller aquamarine-blue upperparts, buffish or whitish chin and...(Moroto) and N & E Kenya (Turkana to Marsabit and Mandera, and S to Samburu, middle R Tana and Tsavo East...Godman, E.M. (1937-1961). The Birds of British Somaliland and the Gulf of Aden. Vols. 1-2. Gurney & Jackson |
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