Gem material Gemstone Healing crystal
Star garnet
Type of garnet that displays a reflected light on its surface resembling a star; specifically, a variety of almandine exhibiting a four-rayed or rarely six-rayed star due to oriented inclusions of rutile; it is the Idaho state gemstone..
Variety of Almandine.
📜 Key facts
| Age | Precambrian to Cretaceous metamorphic rocks of northern Idaho; the garnets weathered into stream gravels |
|---|---|
| Origin & sources | Emerald Creek and Purdue Creek, Idaho Panhandle (USA), and India. Idaho has been one of very few commercial sources. Star garnet has been the state gem of Idaho since 1967. |
| Composition | Almandine garnet with oriented needles of rutile (or other minerals) |
How it forms
Needle-like inclusions grow along several directions in the garnet. Most Idaho stones show a 4-rayed star, and some show 6 rays.
Mineral data: see Almandine.
🌍 Where it's found
- Type locality
- Notable source / deposit
- Country of origin
Marker positions are approximate (region or locality level). Type localities from Wikidata; notable sources curated by Crystopedia.
🔗 See also
- Star Diopside: another stone that often shows a 4-rayed star
Learn more
- Star garnet on Mindat.org
- Wikidata item Q122418066 (source of this page's data – you can correct it there)
Gem material
Red
RootHeart
Gemstone




