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The scapolites are a group of rock-forming silicate minerals composed of aluminium, calcium, and sodium silicate with chlorine, carbonate and sulfate. Named in 1800 by José Bonifácio de Andrada e Silva from the Greek ζκαποζ meaning “a shaft” in allusion to the long prismatic habit of the crystals.
Scapolites can be seen in a wide variety of colours such as purple, yellow, white, grey, brown, reddish-brown, black, pink, orange.
Also, Scapolites can be found in Sri Lanka, Afghanistan, Australia, Antarctica, Austria, Belgium, Botswana, Brazil, Bulgaria, Canada, Chile, China, Cuba, Czech Republic, Finland, Congo, Denmark, Germany, Iran, Italy, India, Japan, Kenya, Madagascar, Lithuania, Morocco, Mozambique, Myanmar, Namibia, New Zealand, Nepal, North Korea, Norway, Pakistan, Peru, Philippine, Portugal, Romania, Russia, Spain, Tanzania, Turkey, UK, USA, UAE.
Most of the scapolites are chatoyant and known as “scapolite cats-eye”. The two endmembers are meionite and marialite. Meionite mostly can be seen in white Colour and marialite in yellow colours. Silvialite (Ca, Na)₄Al₆Si₆O₂₄) is also a recognized member of the group.
¶ Luster: Vitreous
¶ Chemical formula: (Na, Ca)₄(Al, Si)₃Si₆O₂₄ )(Cl, CO₃)
¶ Hardness: 5 – 6
¶ Mineral class: Scapolite
¶ Transparency: Opaque, Translucent, Transparent