Brucite is a naturally occurring mineral composed of magnesium hydroxide with the chemical formula Mg(OH)₂. It belongs to the hydroxide mineral group and crystallizes in the trigonal crystal system. The mineral is named after the American mineralogist Archibald Bruce. Brucite is known for its soft structure, smooth texture, and sometimes striking colors, especially in rare yellow or blue forms. The color of Brucite varies widely and includes white, gray, pale green, blue, and bright yellow. Yellow Brucite, in particular, is highly prized among collectors due to its vivid appearance. The mineral can be transparent to translucent and exhibits a vitreous to pearly luster. It often forms in fibrous, platy, or massive crystal habits, which can create visually appealing specimens.