igneous
Polished larvikite tower (likely)
Larvikite, a feldspar-rich monzonitic igneous rock
AI-generated identification · may be incorrectGray to silvery-white with dark mottling and feldspar crystals; polished surface has a subdued sheen. Composed mainly of alkali feldspar with pyroxene and other dark minerals; hardness about 6–6.5 Mohs. The photo alone cannot confirm the exact rock identification.
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Physical properties
Gray to silvery-white with dark mottling and feldspar crystals; polished surface has a subdued sheen. Composed mainly of alkali feldspar with pyroxene and other dark minerals; hardness about 6–6.5 Mohs. The photo alone cannot confirm the exact rock identification.
Formation & geological history
Larvikite crystallized slowly from magma deep in the crust, chiefly in the Oslo Rift of Norway around 300 million years ago. This piece has been cut and polished into a tower.
Uses & applications
Used as decorative stone, countertops, carvings, and collectible display pieces.
Geological facts
Larvikite is known commercially as Norwegian moonstone, though it is not true moonstone; feldspar crystals can show silvery-blue flashes at certain angles.
Field identification & locations
Look for coarse feldspar grains and blue-silver iridescence that shifts with viewing angle; common sources are around Larvik, Norway. The pictured pattern is suggestive but not diagnostic.
