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Brucite (Photo) [abbr. Brc ]

Year of discovery: 1824 (Castle Point, USA), 1939 (Japan)

Locality list: 97 localities of brucite

• Mg(OH)₂
• [Mg²⁺][(OH)₂]^2-

• Class: Brucite group
• Class: Hydroxide
• Soluble in: HCl
• Fluorescence: UV excitation (Bluish white)
• Electrical: Pyroelectric
• Formed by hydration of Periclase.

• Mg => Mn: Pyrochroite
• Mg => Fe: Amakinite
• Mg => Ca: Portlandite
• Mg => Ni: Theophrastite

• Color: White, Pale green, Pale blue
• Streak: White
• Luster: Vitreous, Pearly
• Diaphaneity: Transparent-Translucent

• Habit: Thin platy, Fibrous

• Cleavage: Perfect on {0001} (1 plane)
• Hardness: 2.5-3
• Density: 2.4

• System: Trigonal
• Group: (-3)m, P(-3)m1
• Lattice: a=3.1, c=4.8