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QUARTZITES Quartzite is sandstone that has been metamorphosed. Unlike sandstone, quartzite breaks through -
SLATESTONES Slate is a fine-grained, homogeneous, metamorphic rock derived from an original shale-type sedimentary rock -
LIMESTONES Limestone is a sedimentary rock composed largely of the mineral calcite -
MARBLE Marble is a metamorphic rock that forms when limestone is subjected to the heat and pressure of metamorphism -
SANDSTONE Sandstone is actually a sedimentary rock formed by the consolidation and compaction of sand.. -
GRANITE Granite is the best-known igneous rock. There are numerous granite quarries -
SEMI PRECIOUS GEMSTONES Semi Precious Gemstones have been placed into the categories of "precious stones" and "semi precious stones