Stone

Stone is a material used mainely for costructions and artcrafts. Geologist have a sistem of clasification for stones and they often use the word "rock" when they're referring to it. I really don`t know a many kinds of stone. some examples are: limestone, marble and gravel. They are very durable and strong, they`re ussually very heavy and they come in all sort of colors and shapes. There was a time when stone wos used as an structural material of a construction, but nowadays we use is as a veneer and as an ingredient to form concrete.
 * ** What are stones? **
 * ** How many kinds of stone do you know? **
 * ** What characteristics do stones have? **
 * ** Why are stones used in construction? **

Stone was one of the first materials human beings used for constructions. Like any other material, it has some advantages and some disadvantages. Stone is very durable, it’s adaptable to sculptural treatment, it’s found naturally **and** **resists deformation better than any other bonding material**. On the other hand, it’s difficult to transport, to cut and to quarry; it is expensive and it is weak in tension and in forces coming from angles. There are two kinds of stonework: rubble, which is the bounding of broken stones with mortar; and ashlar masonry, which is the union of regularly cut blocks of stone. **Ashlar masonry is the strongest stonework for monumental architecture and it does not depend on strong bonding for stability, where it supports only direct downward loads.

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