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  2. Borate mineral - Wikipedia

    en.wikipedia.org/wiki/Borate_mineral

    The Borate Minerals are minerals which contain a borate anion group. The borate (BO 3) units may be polymerised similar to the SiO 4 unit of the silicate mineral class. This results in B 2 O 5, B 3 O 6, B 2 O 4 anions as well as more complex structures which include hydroxide or halogen anions. [2] The [B(O,OH) 4] − anion exists as well.

  3. Sinhalite - Wikipedia

    en.wikipedia.org/wiki/Sinhalite

    Sinhalite is a borate mineral with formula MgAl(BO 4). [2] Sinhalite was first found in Sri Lanka (Ceylon) in 1952, and was named from Sinhala - the Sanskrit name for Sri Lanka. [3] Gemstone quality Sinhalite can also be found in Madagascar, Tanzania and Myanmar (Burma).

  4. Gems of Sri Lanka - Wikipedia

    en.wikipedia.org/wiki/Gems_of_Sri_Lanka

    Sri Lanka, geologically speaking is an extremely old country. Ninety percent of the rocks of the island are of Precambrian age, 560 million to 2,400 million years ago. The gems form in sedimentary residual gem deposits, eluvial deposits, metamorphic deposits, skarn and calcium-rich rocks. Nearly all the gem formations in Sri Lanka are located ...

  5. Borate - Wikipedia

    en.wikipedia.org/wiki/Borate

    Common borate salts include sodium metaborate (NaBO 2) and borax. Borax is soluble in water, so mineral deposits only occur in places with very low rainfall. Extensive deposits were found in Death Valley and shipped with twenty-mule teams from 1883 to 1889. In 1925, deposits were found at Boron, California on the edge of the Mojave Desert.

  6. Graphite mining in Sri Lanka - Wikipedia

    en.wikipedia.org/wiki/Graphite_mining_in_Sri_Lanka

    Graphite mining in Sri Lanka has occurred since the Dutch occupation of the country. It is the only country in the world to produce the purest form of graphite, vein graphite (also known as lump graphite), in commercial quantities, currently accounts for less than 1% of the world graphite production.

  7. Borax (mineral) - Wikipedia

    en.wikipedia.org/wiki/Borax_(mineral)

    Borax (Na 2 B 4 O 5 (OH) 4 · 8 H 2 O [2]) is a borate mineral found in evaporite deposits of alkaline lacustrine environments and as a surface efflorescence in arid regions. It is the chief mineral mined from the deposits at Boron, California and nearby locations, and is the chief source of commercial borax.

  8. List of World Heritage Sites in Sri Lanka - Wikipedia

    en.wikipedia.org/wiki/List_of_World_Heritage...

    The most recent site, the Central Highlands of Sri Lanka, was listed in 2010. The Central Highlands and the Sinharaja Forest Reserve are natural sites, the other six are cultural. In addition, Sri Lanka has four sites on its tentative list. The country served as a member of the World Heritage Committee in the years 1983–1989. [3]

  9. Bogala Graphite Mine - Wikipedia

    en.wikipedia.org/wiki/Bogala_Graphite_Mine

    It is one of the largest graphite mines in Sri Lanka, with commercial mining at this location first commencing in 1847. Merenyagé Arnolis Fernando, born 12 August 1850 in Moratuwa, the second son of Merenyagé Juanis Fernando, a carpenter, and Silapu Perumagé Angela Fernando. [1]