Serendibite is named after “Serendib”, the old Arabic name for Sri Lanka, where the mineral was found.
Serendibite can be found in colors such as pale yellow, blue-green, greyish blue, black. It can be found in Sri Lanka, USA, Canada, Madagascar, Tanzania, Russia, Myanmar. In Sri Lanka, Specially from Kurunegala, Ratnapura, Embilipitiya, Kolonna.
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• Chemical Formula: (Ca,Na)2(Mg,Fe2+)3(Al,Fe3+)3[O2|(Si,Al,B)6O18]
• Elements listed: Al, B, Ca, Mg, O, Si
• Common Impurities: Ti,Fe,Mn,Na,K,F,H2O,P
• Lustre: Vitreous
• Hardness: 6½ – 7
• Specific Gravity: 3.42 – 3.52
• Crystal System: Triclinic
• Density: 3.42 – 3.52 g/cm3 (Measured)
• RI values: nα = 1.701 nβ = 1.703 nγ = 1.706
• Pleochroism: Strong; X = pale yellow, yellow-green
to blue-green; Y = almost colorless, pale yellow, blue, blue-green; Z = light to dark blue.
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• Category: Inosilicates
• Crystal class: Pinacoidal
• Diaphaneity: Transparent, Translucent, Opaque
Serendibite is a Biaxial (+) gemstone and can be seen strong dispersion. Serendibite may be confused with sapphirine and zoisite. Open color gem-quality serendibite gemstones are extremely rare to find from mining and very expensive. Serendibite is still one of the 10 rarest gems in the world.
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The mineral is found in skarns associated with boron metasomatism of carbonate rocks where intruded by granite. Association: Diopside, spinel, phlogopite, scapolite, calcite, tremolite, apatite, grandidierite, sinhalite, hyalophane, uvite, pargasite, clinozoisite, forsterite, warwickite, graphite.
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