Patuxent River stone
The Patuxent River stone is the state gem of the U.S. state of Maryland. It is a quartzite despite the state incorrectly claiming that it was an agate or agatized dinosaur bone—as is found through a quick google search. It is only found in Maryland and its red and yellow colors reflect the Maryland State Flag.
The Patuxent River stone became the state gem effective October 1, 2004 through the passage of Chapter 272, Acts of 2004; Code State Government Article, sec. 13-319.
