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Gorceixite

Year of discovery: 1906 (Ouro Preto, Brazil), 1998 (Japan)

Locality list: 2 localities of gorceixite

• BaAl₃(PO₄)₂(OH)₅,H₂O
• [Ba²⁺][Al³⁺₃][(OH)₆|PO₄|HPO₄]^11-

• Class: Plumbogummite group < Alunite supergroup
• Class: Phosphate - Hydroxide - Hydrate

• Ba => Ca: Crandallite
• Ba => Sr: Goyazite
• Ba => Pb: Plumbogummite

• PO₄ => AsO₄: Arsenogorceixite

• Color: White, Brown
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Cleavage: No
• Hardness: 6
• Density: 3.3

• System: Monoclinic, Pseudotrigonal, Pseudocubic
• Group: m, Cm
• Lattice: a=12.2, b=7.0, c=7.0, β=125.3