# sunstone

> English word · Noun · frequency rank #86,810

## Definitions
1. A translucent form of feldspar having flakes of hematite, used as an ornamental stone.
2. A stone, possibly Icelandic spar, said in late medieval sources to have been used by navigators in the Viking Age and later to find the location of the sun in an overcast sky, possibly via polatization of light.

## Etymology
sun + stone. Compare Icelandic sólarsteinn.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/sunstone