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Manganipiemontite-(Sr)

Year of discovery: 2002 (Wessels mine, South Africa as Tweddillite), 2005 (Japan)

Locality list: A locality of manganipiemontite-(Sr)

• CaSrMn₂Al(SiO₄)₃(OH)
• [Ca²⁺][Sr²⁺][Mn³⁺][Al³⁺Mn³⁺][OH|O|SiO₄|Si₂O₇]^13-

• Class: Epidote group < Epidote supergroup
• Class: Sorosilicate - Nesosilicate - Oxide - Hydroxide

• Mn => Al: Piemontite-(Sr)

• Mn₂ => Al₂: Clinozoisite-(Sr)

• Color: Dark red
• Streak: Reddish brown
• Luster: Vitreous
• Diaphaneity: Transparent

• Cleavage: Perfect on {001} (1 plane)
• Hardness: 6-7

• System: Monoclinic
• Group: 2/m, P2₁/m
• Lattice: a=8.9, b=5.7, c=10.3, β=114.6

Synonym: Tweddillite