Spectrolite

Spectrolite is an uncommon variety of labradorite feldspar. Spectrolite exhibits a richer range of colors than other labradorites. Sometimes spectrolite incorrectly used to describe labradorite whenever a richer display of colors is present.

Finnish geologist Aarne Laitakari (1890–1975) described the peculiar stone and sought its origin for years when his son Pekka discovered a deposit at Ylämaa in south-eastern Finland, while building the Salpa Line fortifications there in 1940. The quarrying of spectrolite began after the Second World War and became a significant local industry.