Pietra Di Luserna
The close-up view of each stone type shows a relatively true image of the crystalline structure and the colouring. This is suitable for grained slabs to a limited extend only. In regard to the colour matching, please take an original sample of the stone from your furniture store as a basis.
Feldspar and quartz contribute with up to 90% to the stone structure. However, both cannot be discerned with the naked eye due to the fine, not clear contour of the grain. The actually black biotite has been partially converted to green chlorite, which gives the rock a light greenish shade. Evenly interspersed silvery muscovite flakes give an unobtrusive glittering effect.
This gneiss is a highly metamorphous rock. It was generated during folding-up of the Alps. Probably clay-sandy sediment rocks were exposed to very high pressures and temperatures. The results were forming of new minerals, crystallisation and adjustment of the mineral components, as they are clearly recognisable in this classic rock.
|Structure Type||Homogeneous Structure|
|Synonyms||Alpengrün, Luserna Gneis, Verde San Elena|
|Petrographic Assignment||Gneiss - Para gneiss|
|Age||500 million years (Palaeozoic)|
|Colouring Minerals||Feldspar (here albite): white, quartz: translucent Biotite: black, muscovite: silvery, shining|
|Average Hardness||7 (according to Mohs's hardness scale 1-10)|
|Deposit||Luserna San Giovanni / sw Turin / Italy|