[ Top ] [ Japanese ]

Pumpellyite-(Al) (Photo) [abbr. Pmp ]

Year of discovery: 1925 (La Flèche quarry, Belgium), 1936 (Japan)

Locality list: 209 localities of pumpellyite-(Al)

• Ca₂Al₃Si₃O₁₂(OH),H₂O
• Ca₂(Al,Fe,Mn,Mg)Al₂Si₃O₁₁(OH,O)₂,H₂O
• [Ca²⁺₂][Al³⁺][Al³⁺₂][OH|O|SiO₄|Si₂O₇]^13-,H₂O

• Class: Pumpellyite series - Pumpellyite group
• Class: Sorosilicate - Nesosilicate - Oxide - Hydroxide - Hydrate

• Ca => Mn: Sursassite

• Al => Fe: Pumpellyite-(Fe3+)

• Al₃ => Fe₃: Julgoldite-(Fe3+)
• Al₃ => V₃: Poppiite

• AlO => Fe(OH): Pumpellyite-(Fe2+)
• AlO => Mn(OH): Pumpellyite-(Mn)
• AlO => Mg(OH): Pumpellyite-(Mg)

• Al₃O => Mn₃(OH): Okhotskite (Series)
• Al₃O => Fe₃(OH): Julgoldite-(Fe2+)

• Color: White, Grayish green
• Streak: White
• Luster: Vitrous
• Diaphaneity: Transparent-Translucent

• Habit: Acicular
• Aggregate: Radial

• Cleavage: Good on {001} and {100} (2 planes)
• Hardness: 5.5
• Density: 3.5

• System: Monoclinic
• Group: 2/m, A2/m
• Lattice: a=8.8, b=5.9, c=19.1, β=97.3

Etymology: Raphael Pumpelly (1837-1923), American geologist