[Krystyna]

   
http://lh3.googleusercontent.com/-yPQ3Dn...2520cm.jpg
No Biotite here. This rock is composed of alkali Feldspar and Amphibole of the tremolite-actinolite series. However, it is likely that Phlogopite was here before the rock was altered to its current composition. Impure metamorphosed carbonate rocks that contain Phlogopite, calcite and Quartz can be metamorphosed to Feldspar-Tremolite rock: Phlogopite + Calcite + Quartz → Tremolite + K-feldspar + CO2 + H2O. Sample from Southern Norway. Width of sample 9 cm.