Maryland State Gem - Patuxent River Stone

Effective October 1, 2004, the Patuxent River Stone became the State Gem of Maryland (Chapter 272, Acts of 2004; Code General Provisions Article, sec. 7-324).

The Patuxent River Stone is actually an agate, a cryptocrystalline form of quartz. Found only in Maryland, the Patuxent River Stone's colors of red and yellow reflect the Maryland State Flag.

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