Breccia is a kind of clastic rock, which is formed by crushing the detritus with particle size greater than 2 mm from the parent rock and carrying, depositing, compacting and cementing. If the average diameter of gravel is 1- 10 mm, it is fine gravel, and 10- 100 mm is called coarse gravel, which is more than 65438. Its cement often contains minerals, and breccia can also be used as building materials. The breccia is rough with obvious gravel. If more than 50% of the gravel cemented into rocks is round and more than 50% is angular, it is called breccia. Breccia can be used as a scientific research object to study parent rock and also as a building material.
There are many breccias, but few of them are silicified into colloidal structures. If the breccia stone is good, it can be used as ornaments such as pendants and brands, with good natural patterns. Complete angular gravel has a unique flavor as an ornament.