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.
|Age||330 million years (Carboniferous/Devonian)|
|Colouring minerals:||White feldspar|
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.
Petrology:Coarse grain granite, consisting of white to champagne coloured feldspar, light grey to transparent quartz and a small portions of biotite (black mica). The biotite is usually evenly distributed as fine black scales, but can occasionally form in concentrations as large as 5cm. The quartz and feldspar crystals form a dense, homogeneous crystal structure.
Petrogenesis:The granites of North Sardinia were generated from several silicic acid-rich magma complexes which, as huge plutonite (plutonic rocks) within the earth crust, slowly crystallised into coarse grain granite. Because of slow cooling-down over several millions of years, there was enough time for the formation (collection crystallisation) of large feldspar crystals.