from The Century Dictionary.
- noun Same as
Chessy copper(which see, under copper).
Sorry, no etymologies found.
(hence the name chessylite, sometimes used instead of azurite).
The most abundant oxidised ores are the carbonates, malachite and chessylite; the silicates, as also the red and black oxides, occur less abundantly.
(malachite and chessylite), and carbonate of magnesia (magnesite), are common.