Larvikite drilled pendant from Norway (quite rare to get as a pendant!)

Larvikite is an igneous rock that contains a lot of plagioclase, mainly in scaly form. This gives the rock a typical blue-gray shine and a "shiny" appearance when polished, although this is not caused by glimmers. Larvikite is a rock that mainly consists of feldspars (mainly plagioclase), but also small amounts of quartz, nepheline, olivine, augite, hornblende, ilmenite, magnetite, apatite, zircon and / or biotite. The feldspars have a scaly habit, making them (in polished form) resemble micas. Feldspars, however, are tectosilicates and micas (or glimmers) phylosilicates. Due to tectonics, the larvite complex is intersected by veins that mainly contain nepheline. The larvikite rock is named after the place where it was first described, Larvik in Norway. Larvikiet is mainly known from the region around Oslo, an area in Southern Norway where Larvik is also located. The area consists of a complex of magmatic rock, mainly monzonite. The volcanism that has formed this complex has been dated to early Permian (297 - 292 Ma) using the U-Pb method. It is suspected that the magmatic activity in the area is related to the opening of the current North Sea, a rift basin that ultimately did not lead to ocean formation (a so-called failed rift).