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Brandtite

Year of discovery: 1888 (Harstigen mine, Sweden), 1989 (Japan)

Locality list: A locality of brandtite

• Ca₂Mn(AsO₄)₂,2H₂O
• (Ca,Pb)₂(Mn²⁺,Mg)(AsO₄)₂,2H₂O
• [Ca²⁺₂][Mn²⁺][(AsO₄)₂]^6-,2H₂O

• Class: Arsenate - Hydrate
• Soluble in: HCl, HNO₃, H₂SO₄

• Polymorph: Parabrandtite (Triclinic)

• Mn => Co: Roselite, β-Roselite
• Mn => Mg: Wendwilsonite, Talmessite
• Mn => Cu: Rruffite
• Mn => Zn: Zincroselite, Gaitite
• Mn => Ni: Nickeltalmessite

• AsO₄ => PO₄: Fairfieldite

• Color: Colorless, White
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent, Translucent

• Cleavage: Perfect on {010} (1 plane), Good on {001} (1 plane)
• Hardness: 3.5
• Density: 3.7

• System: Monoclinic
• Group: 2/m, P2₁/c
• Lattice: a=5.9, b=13.0, c=5.7, β=108.1