Larvakite is a variety of monzonite that is named after the town of Larvik, Norway. It is a dark grey igneous rock that gets its silver blue sheen - the Schiller effect - from interlocking crystals of feldspar. Larvakite is also known as Norwegian moonstone, black labradorite and blue granite (even though it is not granite).
Legend has it that a local geologist saw this rock glimmering in the moonlight and recommended that it be submitted as a representative stone from Norway to the World's Fair in Germany in the early 1890s, where it won 1st prize. Whether this is true or not, the stone has been used in sculpture, jewelry and architecture ever since.
Metaphysically, larvakite is considered to be a grounding stone.
This semiprecious gemstone is mined in Norway.
Mohs hardness: 6.5 - 7.0