What type of rock is moonstone?

Answer Moonstone, a gemstone also known as selenite, is a potassium aluminosilicate, belonging to a large mineral group called feldspars, which actually make up about two-thirds of all the rock on Earth.S... Read More »

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What type of rock is azurite?

Azurite is not a rock at all. Rather, azurite is a type of mineral made from three copper atoms, three carbonate molecules and two hydroxide molecules. Azurite belongs to the carbonate class of min... Read More »

What type of rock is soapstone?

Soapstone, also known as steatite, is a soft rock comprised mostly of talc. Geologists classify it as a metamorphic rock because it results from an igneous rock (peridotite) being subjected to extr... Read More »

What type of rock is alexandrite?

Alexandrite, valued as a gemstone that changes from red to green depending on the light, is a type of chrysoberyl, the Gemological Society of America says. Chrysoberyl's chemical formula is BeAl2O4... Read More »

What type of rock is marble?

Marble is a non-foliated metamorphic rock derived from limestone or dolostone.