3.
is used to polish ornaments.
Conglomerate O
Sandstone
Gneiss
Quartzite
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It helps clean drinking water and treat sewage. ... Gneiss is a type of metamorphic rock that forms when a sedimentary or ... Well, conglomerate can actually be used in the making of concrete. ... Sandstone comes in a variety of colors including red, yellow, gray, and brown. ... Obsidian is used as a gemstone in jewelry.
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