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Apatite

JewelryWiki Editorial·2 sources·Reviewed 2026-07-31
Apatite specimen
Apatite specimen. Thomas Spann, CC BY 2.0 · Wikimedia Commons

Defines point 5 on the Mohs scale itself. Attractive but too soft for rings in regular wear.

Properties

PropertyValueAuthority
Refractive index1.628–1.649 [1]—
Specific gravity3.16–3.23 [1]—
Crystal systemHexagonal [2]—

Sources

  1. International Gem Society — reference charts (Mohs hardness, specific gravity, refractive index) — International Gem Society (IGS reference charts)
  2. Wikipedia — mineral article infoboxes (crystal system) — Wikipedia contributors (Wikipedia mineral infoboxes)