Traditional Culture Encyclopedia - Lucky day inquiry - What are the auspicious days in March 2023?
What are the auspicious days in March 2023?
Threshold stone, as its name implies, is a stone laid on the threshold, which is used to divide different materials or different functional areas, so it is also called threshold stone. Metamorphic rocks formed by primary rocks in the crust under the action of high temperature and high pressure in the crust belong to medium-hard rocks, which are mainly composed of calcite, limestone, serpentine and dolomite. Its main component is calcium carbonate, and the natural marble is fine and solid, smooth as a mirror after polishing, and the texture is natural and smooth.
Threshold stone type
Artificial marble is made of natural marble or granite crushed stone as filler, cement, gypsum and unsaturated polyester resin as binder through stirring, molding, grinding and polishing. Therefore, artificial marble has the characteristics of various colors, good flexibility and strong sense of integrity of natural marble, but it is obviously harmful to human body.
Ceramic tile, also called ceramic tile, is a kind of acid and alkali-resistant porcelain or stone, which is made of refractory metal oxide and semi-metal oxide through grinding, mixing, pressing, glazing and sintering. Building or decorative materials are called tiles, which are mainly made of clay and quartz sand.
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