The precipitation method is also called the wet method, and the main raw materials are quartz sand, soda ash, industrial hydrochloric acid or sulfuric acid or nitric acid or carbon dioxide.

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Black tourmaline, a captivating gemstone known for its stunning black color and protective metaphysi

Black tourmaline, a striking mineral with its ionic black hue, has long been a favorite among both c

Black tourmaline, known for its protective and grounding properties, is a beautiful and powerful gem

Black tourmaline, often revered for its protective and grounding properties, is a staple in the mine

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