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Eilat Stone derives its name from the city of Eilat where it was once mined, it is a green-blue inhomogeneous mixture of several secondary copper minerals including malachite, azurite, turquoise, pseudomalachite, chrysocolla. The Eilat stone is the National stone of Israel, and is also known as the King Solomon Stone.
The blue and green stones sold in tourist souvenir shops are generally imported from foreign copper mines, and are not really from Israel.