RocksdayWashington State Gem: Petrified wood
Washington's state gem is petrified wood, adopted in 1975. Washington's state fossil is the Columbian mammoth (Mammuthus columbi), adopted in 1998. Washington's state dinosaur is Suciasaurus rex, adopted in 2023.
Symbol names and dates are taken from primary state sources linked below. Informal or proposed symbols are not listed unless adopted.
State gem: Petrified wood
- Adopted:
- 1975
- Law:
- RCW 1.20.090; 1975 c 8 s 1
Petrified wood is a fossil with a Mohs hardness of about 6.5–7 and a waxy to vitreous luster, usually brown, red, yellow, gray or black.
How to identify petrified wood →
Often confused with: Chert, Jasper, Turritella Agate
Also an official symbol of: Arizona, Mississippi, North Dakota, Texas
State fossil: Columbian mammoth (Mammuthus columbi)
- Adopted:
- 1998
- Law:
- RCW 1.20.042; 1998 c 129 s 2
State dinosaur: Suciasaurus rex
- Adopted:
- 2023
- Law:
- RCW 1.20.041; 2023 c 330 s 2
Washington state symbols FAQ
What is the state gem of Washington?
Washington's state gem is petrified wood, adopted in 1975 (RCW 1.20.090; 1975 c 8 s 1).
What is the state fossil of Washington?
Washington's state fossil is the Columbian mammoth (Mammuthus columbi), adopted in 1998 (RCW 1.20.042; 1998 c 129 s 2).
What is the state dinosaur of Washington?
Washington's state dinosaur is Suciasaurus rex, adopted in 2023 (RCW 1.20.041; 2023 c 330 s 2).
Sources
We cite primary sources (statutes, state government pages, federal regulations, and land-manager sites). Third-party listicles are not used as citations.
- Revised Code of Washington chapter 1.20, State symbols — Washington 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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