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.
|Labrador Blue Star, Perla Smeralda, Verde Larvic, Dunkel Labrador, Labrador Verde, Verde Larvik, Labrador Scuro, Dark Larvikite|
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||270 million years (Permian)|
|Colouring minerals||Dark-grey anorthoclase feldspar (shines bluish at a certain viewing angle), black biotite, black-olive pyroxene, metallic shining ore minerals (magnetite).|
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.
|Origin||Norway – Larvik|
Pearlescent surface changes and shimmers with every angle change.
Striking flashes of silver, blue and green throughout.
Petrology: A coarse-grained, black to black olive-coloured plutonic rock of consistently regular, homogeneous structure. 85 % – 90 % of it consists of dark anorthoclase feldspars along with black biotite mica and black-grey pyroxene (augite). The characteristic shimmering effects are the result of the refraction and reflection of the light falling on the lamella-like fused anorthoclase crystals. The shimmer reflection effects from the various viewing angles depend on the cutting plane.
Petrogenesis: During the Permian period intrusions of melts rich in potassium and sodium solidified within the earth crust. The magma could solidify very uniformly within the earth crust over millions of years so that identical molecules gathered and crystallised into black to black-olive coloured feldspars.