STONE CATALOG  
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Slate
Microcrystalline metamorphic rock most commonly dervived from shale and composed mostly of micas, chlorite and quartz. The micaceous minerals have a subparallel orientation and thus impart strong cleavage to the rock which allows the latter to split into thin but tough sheets.
Quartzite
Highly indurated, typically metamorphosed sandstone containing at least 95% silica which fractures conchoidally through grain.
Sandstone
Sedimentary Rock composed mostly of mineral and rock framents within the sand size range 2 to 0.06 mm and having a minimumof 60% free silica, cemented or bonded to greater or lesser degree by various materials include silica, iron oxides, carbonated or clay.
Green Marble
Serpentine Marble, a rock consisting mostly or entirely of serpentine (hydrated magesium silicate), commomly veined with calcite, and dolomite or magnesite or magnesium carbonate

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