There are two typical structural forms of red sandstone: granular clastic structure and argillaceous cementation structure. Due to the difference of cementing material and weathering degree, its strength changes greatly.

After excavation or blasting, most of the sandstone will disintegrate, break or even muddy under the action of atmospheric environment, so the size and particle gradation of its rock block will change with the time course of dry-wet cycle, and its physical and mechanical properties will also change.

2. Red shale

Red shale is a clay rock. The composition is complex, except clay minerals (such as kaolinite, montmorillonite, hydromica, dolomite, etc. ), it also contains many detrital minerals (such as quartz, feldspar, mica, etc. ) and authigenic minerals (such as oxides and hydroxides of iron, aluminum and manganese). ). With flaky or flaky bedding. Hit with a hard object, it will easily break into pieces.

3, bloodstone

Bloodstone, a cornerstone of cinnabar, is named after cinnabar (Cinnabar) as bright red as chicken blood. Bloodstone contains cinnabar (Cinnabar), Yingshi and chalcedony 35%-45%. Magnetite and hematite 6%- 12%. About 5%-8% in cinnabar.

Bloodstone, together with Shoushan Stone, Qingtian Stone and Balin Stone, enjoys the reputation of "Four National Stones" in China. Mainly used as seal or craft carving material. China first discovered Yuyanshan bloodstone in Changhua, Zhejiang.

Later, bahrain bloodstone was discovered in Bahrain Right Banner, Chifeng City, Inner Mongolia. In 1990s, bloodstone was discovered in Guizhou, Shaanxi, Gansu, Sichuan, Hunan, Yunnan and Xinjiang.

4, blood pearls

An amber, red, or crimson color, as of wine. The main producing area is Myanmar. It is a good product to wear, give and collect, and can protect yourself and your family from being safe, auspicious, healthy and happy.

5, red crystal.

Also known as red rabbit hair crystal, alias "Venus crystal", is a kind of fine wool soft winding network rutile. Produced in Kazakhstan, Orange River, Brazil, Canada, Spain, China, Guangdong, Russian and other places.

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