Lu Hui" is a product trademark registered in the Trademark Office of the State Administration for Industry and Commerce. It is unique and unique. Because the place of origin is in Shandong (Shandong is abbreviated as "Lu"), the color is gray and white, so it is named "Lu Hui". Gray", export code: G3743. And the best quality Luhui blocks come from the No. 13 mine in the first mining area of ??Luhui Stone Co., Ltd. in Sishui County (known as "County Mine" in the industry). The color of the burned surface of Luhui is gray and the polished surface is gray. Black, with fine particles and dense texture, it belongs to the granite series, with a Mohs hardness of 7.6, a density of 2.73 tons/cubic, acid and alkali resistance, and low radiation. The real "Lu Hui" does not have No. 1 or No. 2.