RocksdayMassachusetts State Rock, Mineral & Gem: Roxbury puddingstone (Roxbury conglomerate), Granite, Plymouth Rock…
Massachusetts's rock or rock emblem is Roxbury puddingstone (Roxbury conglomerate). Massachusetts's building and monument stone is granite. Massachusetts's historical rock is Plymouth Rock. Massachusetts's explorer rock is Dighton Rock. Massachusetts's glacial rock is Rolling Rock, Fall River. Massachusetts's mineral or mineral emblem is babingtonite, adopted in 1981. Massachusetts's gem or gem emblem is rhodonite, adopted in 1979. Massachusetts's fossil or fossil emblem is the dinosaur track, adopted in 1980. Massachusetts's official dinosaur is Podokesaurus holyokensis.
Symbol names and dates are taken from primary state sources linked below. Informal or proposed symbols are not listed unless adopted.
Rock or rock emblem: Roxbury puddingstone (Roxbury conglomerate)
- Law:
- M.G.L. c. 2, § 22
- Variety:
- Roxbury puddingstone
It is a variety of conglomerate. Conglomerate is a sedimentary rock with a Mohs hardness of about 5–7 and a dull luster, usually brown, gray or red.
How to identify conglomerate →
Often confused with: Breccia, Coquina, Metaconglomerate
Building and monument stone: Granite
- Law:
- M.G.L. c. 2, § 25
Granite is an igneous rock with a Mohs hardness of about 6–7 and a granular, sparkly luster, usually pink, gray, white or black.
Often confused with: Arkose, Diorite, Gneiss
Also an official symbol of: New Hampshire, North Carolina, South Carolina, Vermont, Wisconsin
Historical rock: Plymouth Rock
- Law:
- M.G.L. c. 2, § 23
Explorer rock: Dighton Rock
- Law:
- M.G.L. c. 2, § 24
Glacial rock: Rolling Rock, Fall River
- Law:
- M.G.L. c. 2, § 59
Mineral or mineral emblem: Babingtonite
- Adopted:
- 1981
- Law:
- M.G.L. c. 2, § 18
Babingtonite is a mineral with a Mohs hardness of 5.5–6 and a vitreous luster, usually black or green.
How to identify babingtonite →
Often confused with: Black Tourmaline, Ilvaite
Gem or gem emblem: Rhodonite
- Adopted:
- 1979
- Law:
- M.G.L. c. 2, § 15
Rhodonite is a mineral with a Mohs hardness of 5.5–6.5 and a vitreous luster, usually pink, red or black.
Often confused with: Eudialyte, Rhodochrosite, Rose Quartz
Fossil or fossil emblem: Dinosaur track
- Adopted:
- 1980
- Law:
- M.G.L. c. 2, § 17
Official dinosaur: Podokesaurus holyokensis
- Law:
- M.G.L. c. 2, § 64
Massachusetts state symbols FAQ
What is the rock or rock emblem of Massachusetts?
Massachusetts's rock or rock emblem is Roxbury puddingstone (Roxbury conglomerate) (M.G.L. c. 2, § 22).
What is the building and monument stone of Massachusetts?
Massachusetts's building and monument stone is granite (M.G.L. c. 2, § 25).
What is the historical rock of Massachusetts?
Massachusetts's historical rock is Plymouth Rock (M.G.L. c. 2, § 23).
What is the explorer rock of Massachusetts?
Massachusetts's explorer rock is Dighton Rock (M.G.L. c. 2, § 24).
What is the glacial rock of Massachusetts?
Massachusetts's glacial rock is Rolling Rock, Fall River (M.G.L. c. 2, § 59).
What is the mineral or mineral emblem of Massachusetts?
Massachusetts's mineral or mineral emblem is babingtonite, adopted in 1981 (M.G.L. c. 2, § 18).
What is the gem or gem emblem of Massachusetts?
Massachusetts's gem or gem emblem is rhodonite, adopted in 1979 (M.G.L. c. 2, § 15).
What is the fossil or fossil emblem of Massachusetts?
Massachusetts's fossil or fossil emblem is the dinosaur track, adopted in 1980 (M.G.L. c. 2, § 17).
What is the official dinosaur of Massachusetts?
Massachusetts's official dinosaur is Podokesaurus holyokensis (M.G.L. c. 2, § 64).
Sources
We cite primary sources (statutes, state government pages, federal regulations, and land-manager sites). Third-party listicles are not used as citations.
- Massachusetts General Laws chapter 2, State emblems (§§ 15, 17, 18, 22–25, 59, 64) — Massachusetts Legislature (accessed 2026-10-24).
- Concise Facts — Secretary of the Commonwealth of Massachusetts (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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