Lapis lazuli, also known simply as “lapis,” is a blue metamorphic rock that has been used by people as a gemstone, sculpting material, and ornamental material for thousands of years.Unlike most other gem materials, lapis lazuli is not a mineral. Instead, it is a rock composed of multiple minerals.
https://bitbillions.com/the-lapis-lazuli-blue-metamorphic-rock/
Thursday, October 6, 2016
The Lapis Lazuli - Blue Metamorphic Rock
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