Maine State Rock & Mineral: Tourmaline, Granitic pegmatite

Maine's official mineral is tourmaline, adopted in 1971. Maine's state rock is granitic pegmatite, adopted in 2023.

Symbol names and dates are taken from primary state sources linked below. Informal or proposed symbols are not listed unless adopted.

Tourmaline specimen — Tourmaline (not necessarily from Maine). Photo: Robert M. Lavinsky, CC BY-SA 3.0, via Wikimedia Commons

Official mineral: Tourmaline

Adopted:: 1971
Law:: 1 M.R.S. § 213; PL 1971, c. 50

Tourmaline is a mineral (Complex borosilicate) with a Mohs hardness of 7–7.5 and a vitreous luster, usually black, green or pink.

How to identify tourmaline →

Often confused with: Apatite, Biotite, Black Tourmaline

Pegmatite specimen — Pegmatite (not necessarily from Maine). Photo: No machine-readable author provided. Zimbres assumed (based on copyright claims)., CC BY-SA 2.5, via Wikimedia Commons

State rock: Granitic pegmatite

Adopted:: 2023
Law:: 1 M.R.S. § 230; PL 2023, c. 15

Pegmatite is an igneous rock with a Mohs hardness of about 6–7 and a granular, glassy luster, usually pink, white, gray or black.

How to identify pegmatite →

Often confused with: Aplite, Granite

Maine state symbols FAQ

What is the official mineral of Maine?

Maine's official mineral is tourmaline, adopted in 1971 (1 M.R.S. § 213; PL 1971, c. 50).

What is the state rock of Maine?

Maine's state rock is granitic pegmatite, adopted in 2023 (1 M.R.S. § 230; PL 2023, c. 15).

Sources

We cite primary sources (statutes, state government pages, federal regulations, and land-manager sites). Third-party listicles are not used as citations.

Maine Revised Statutes Title 1, § 213, Official mineral — Maine Legislature (accessed 2026-10-24).
Maine Revised Statutes Title 1, § 230, State rock — Maine 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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