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Portlandite

Year of discovery: 1933 (Scawt hill, UK), 2021 (Japan)

Locality list: A locality of portlandite

• Ca(OH)₂
• [Ca²⁺][(OH)₂]^2-

• Class: Brucite group
• Class: Hydroxide

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

• Color: Colorless, Pale yellow
• Streak: White
• Luster: Pearly
• Diaphaneity: Transparent

• Cleavage: Perfect on {0001} (1 plane)
• Hardness: 2.5-3
• Density: 2.2

• System: Trigonal
• Group: (-3)m, P(-3)m1
• Lattice: a=3.6, c=4.9