Stones can have many aliases. This is due to language differences, supplier choice, coloquial trends or slang, or sometimes errors and ambiguity between rocks. Read more here.
Commercial classification sometimes differs to the scientific, geological designation. In particular, some limestones are deemed marble especially if they take a high polish. Read more here.
|Petrographic assignment||Metamorphite – quartz sandstone|
|Colouring minerals:||Pure white-grey quartz|
MOHS is the standard scale of hardness for minerals 1-10, with 10 being the MOHS of diamond. We also use the broad terms Hard and Soft for simplicity. Read more here.
A very hard metamorphic rock which was originally pure quartz sandstone.
Petrogenesis:Heat and pressure force the sandstone to recrystallise into an interlocking mosaic of quartz crystals. Minor amounts of iron oxide, silica, carbonate and clay, often migrate during metamorphosis, causing streaks and lenses to form within the quartzite.