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Wallkilldellite

Year of discovery: 1982 (Sterling mine, USA), 2001 (Japan)

Locality list: A locality of wallkilldellite

• Ca₂Mn₃(AsO₄)₂(OH)₄,9H₂O
• [Ca²⁺₂][Mn²⁺₃][(OH)₄|(AsO₄)₂]^10-,9H₂O

• Class: Wallkilldellite series
• Class: Arsenate - Hydroxide - Hydrate

• Mn => Fe: Wallkilldellite-(Fe)

• Color: Dark red, Black
• Streak: Pale orange
• Luster: Resinous
• Diaphaneity: Translucent

• Habit: Micaceous

• Cleavage: Perfect on {0001} (1 plane)
• Hardness: 3
• Density: 2.9

• System: Hexagonal
• Group: 6/mmm, P6/mmc
• Lattice: a=6.5, c=23.5

Synonym: Wallkilldellite-(Mn)