Larvikite

Larvikite is named after the town of Larvik in Norway, where this type of igneous rock is found.

Larvikite is a relatively coarse-grained anorthoclase-rich igneous rock. Anorthoclase constitutes 90 or more percent of this rock. The presence of the alternating alkali feldspar and plagioclase layers give characteristic silver blue sheen (Schiller effect) on polished surfaces.

Larvikite is used throughout the world as a facing stone. It is frequently found fronting the facades of buildings. Larvikite can be used for making ornaments, such as paper weights, bookends, etc.

Larvikite is sometimes known informally as Blue Granite or Birds eye Granite, although this is not an accurate description.

Norwegian Pearl granite – trade name sometimes applied to the lighter coloured variety of Larvikite.

Royal blue pearl granite – trade name sometimes applied to the darker coloured variety of Larvikite.
Physical Properties of Larvikite
Mohs Hardness6 to 6.5
Michael O’Donoghue, Gems, Sixth Edition (2006)
Specific Gravity2.59
Michael O’Donoghue, Gems, Sixth Edition (2006)
Colour
Colour (General)Bluish grey with two more-or-less distinct colour varieties, one light bluish grey, the other dark bluish grey with golden brown overtones.
Michael O’Donoghue, Gems, Sixth Edition (2006)
TransparencyTransparent,Translucent,Opaque
Michael O’Donoghue, Gems, Sixth Edition (2006) Subtransparent to subtranslucent
LustrePearly
Michael O’Donoghue, Gems, Sixth Edition (2006) Overall pearly
Further Information
Mineral information:Larvikite information at mindat.org
Significant Gem Localities
Norway
 
  • Vestfold
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