Sunstone

noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    A translucent form of feldspar having flakes of hematite, used as an ornamental stone. countable, uncountable
  2. 2
    a translucent quartz spangled with bits of mica or other minerals wordnet
  3. 3
    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. countable, uncountable

Synonyms

All synonyms
aventurinehelioliteheliolite

Etymology

sun + stone. Compare Icelandic sólarsteinn.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.