[ Top ] [ Japanese ]

Jimthompsonite [abbr. Jim ]

Year of discovery: 1978 (Carlton quarry, USA), 1991 (Japan)

Locality list: 2 localities of jimthompsonite

• Mg₅Si₆O₁₆(OH)₂
• (Mg,Fe)₅Si₆O₁₆(OH)₂
• [Mg²⁺₅][(HSi₃O₉)₂]^10-

• Class: Jimthompsonite group
• Class: Inosilicate (Single chain)

• Polymorph: Clinojimthompsonite (Monoclinic)

• Color: Colorless, Pale brown
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent

• Cleavage: Perfect on {210} (2 planes)
• Hardness: 2-2.5
• Density: 3.0

• System: Orthorhombic
• Group: mmm, Pbca
• Lattice: a=18.6, b=27.2, c=5.3