Turquoise is incorrectly written, and should be written as "Turquoise" being its meaning:The correct term is Turquoise. It is a precious stone of greenish blue. Chemically it is a phosphate of copper and aluminium. Its formula is: 40 CuAl6; PO4 ) 4 40 41 OH; 8·5H2O. It is scarce and valuable.
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