RocksdayLouisiana State Mineral & Gem: Agate, Cabochon-cut gemstone from the Eastern oyster (Crassostrea virginica)
Louisiana's state mineral is agate, adopted in 2011. Louisiana's state gemstone is a cabochon-cut gemstone from the Eastern oyster (Crassostrea virginica), adopted in 2011.
Symbol names and dates are taken from primary state sources linked below. Informal or proposed symbols are not listed unless adopted.
State mineral: Agate
- Adopted:
- 2011
- Law:
- R.S. 49:163.1; Acts 2011, No. 232
Agate is a mineral (SiO₂) with a Mohs hardness of 6.5–7 and a waxy to vitreous luster, usually red, orange, white, gray, brown or blue.
The statute specifies agate as found in Louisiana gravel.
Often confused with: Blue Lace Agate, Carnelian, Chalcedony
Also an official symbol of: Kentucky, Maryland, Minnesota, Montana, Nebraska, South Dakota, Tennessee
State gemstone: Cabochon-cut gemstone from the Eastern oyster (Crassostrea virginica)
- Adopted:
- 2011
- Law:
- R.S. 49:163; Acts 2011, No. 232
Before 2011 agate was the state gemstone; Act 232 moved agate to state mineral and named the oyster-shell gemstone.
Louisiana state symbols FAQ
What is the state mineral of Louisiana?
Louisiana's state mineral is agate, adopted in 2011 (R.S. 49:163.1; Acts 2011, No. 232).
What is the state gemstone of Louisiana?
Louisiana's state gemstone is a cabochon-cut gemstone from the Eastern oyster (Crassostrea virginica), adopted in 2011 (R.S. 49:163; Acts 2011, No. 232).
Sources
We cite primary sources (statutes, state government pages, federal regulations, and land-manager sites). Third-party listicles are not used as citations.
- Louisiana R.S. 49:163.1, State mineral — Louisiana State Legislature (accessed 2026-10-24).
- Louisiana R.S. 49:163, State gemstone — Louisiana State Legislature (accessed 2026-10-24).
Last verified 2026-10-24. Corrections welcome: if a statute has changed, tell us and we'll re-verify.
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