Larvikite
Rock
Also called Blue pearl granite and Norwegian moonstone
About it
A dark grey monzonite whose large feldspar crystals flash blue and silver as the stone turns. Quarried around Larvik, Norway, for polished building stone and widely sold tumbled.
- Type
- Rock (igneous)
- Group
- Igneous (plutonic)
- Hardness (Mohs)
- 6–6.5
- Lustre
- vitreous (glassy)
- Colours
- dark grey, blue-grey, black, with blue or silver flashes
- Transparency
- opaque
Typical values: real specimens vary. For more, see mindat.org.