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Holtstamite

Year of discovery: 2003 (Wessels Mine, South Africa), 2020 (Japan)

Locality list: A locality of holtstamite

• Ca₃Al₂(SiO₄)₂(OH)₄
• Ca₃(Al,Mn³⁺)₂(SiO₄)₂(OH)₄
• [Ca²⁺₃][Al³⁺₂][SiO₄)₂][(OH)₄]^12-

• Class: Henritermierite group < Garnet supergroup
• Class: Nesosilicate - Hydroxide

• Al => Mn: Henritermierite

• (SiO₄)₂ = (OH)₈: Katoite

• Color: Brownish yellow
• Luster: Vitreous
• Diaphaneity: Transparent

• System: Tetragonal
• Group: 4/mmm, I4₁/acd
• Lattice: a=12.3, c=11.9