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In nature, sandblasting of exposed rock surfaces in arid environments can create a dark coating called desert varnish.
Historically, the material used for artificial sandblasting was sand that had been sieved to a uniform size. The silica dust produced in the sandblasting process caused sillicosis after sustained inhalation of dust. Sandblasting may now only be performed in a controlled environment using ventilation, protective clothing and breathing air supply.
Other materials for sandblasting have been developed to be used instead of sand; for example, glass beads, metal pellets, and even ground coconutThe Coconut Palm Cocos nucifera L. is a member of the Family Arecaceae (palm family). It is the only species classified in the genus Cocos . The term coconut refers to the fruit of the coconut palm. Origins The origins of this plant are the subject of deb shells have been used for specific applications and produce distinct surface finishes.