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Labrador Blue Star

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.

Petrography

Labrador Blue Star occurs as 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 potassium and sodium - rich melts occurred on the Scandinavian Shield, linked with the formation of the Oslo Graben. These got stuck and 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.

Hardness Hard Stone
Structure Type Homogeneous Structure
Synonyms Emerald Pearl, Labrador Verde, Perla Smeralda, Verde Larvic
Group Plutonic rock - Plutonite
Petrographic Assignment Granite - Syenite - Larvikite
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)
Average Hardness 6-7 (according to Mohs's hardness scale 1-10) / Natural stone
Deposit Norway - approximately 100 km. south of Oslo, in the neighbourhood of the town of Larvik