[ Top ] [ Japanese ]

Ilvaite (Photo) [abbr. Ilv ]

Year of discovery: 1811 (Torre di Rio - Santa Filomena area, Italy), 1892 (Japan)

Locality list: 90 localities of ilvaite

• CaFe₃Si₂O₈(OH)
• [Ca²⁺][Fe²⁺₂][Fe³⁺][OH|O|Si₂O₇]^9-

• Class: Lawsonite group
• Class: Sorosilicate - Oxide - Hydroxide
• Soluble in: HCl (Gel residue)
• Magnetism: Paramagnetic (Weak)

• Fe²⁺₂ => FeMn: Manganilvaite

• Color: Black
• Streak: Dark brown
• Luster: Sub-Metallic
• Diaphaneity: Opaque

• Habit: Prismatic with rhombus cross section

• Cleavage: Distinct on {001} and {010} (2 planes)
• Hardness: 5.5-6
• Density: 4.0

• System: Orthorhombic
• Group: mmm, Pbnm
• Lattice: a=8.8, b=13.0, c=5.9

Etymology: Elba island, Italy

Synonym: Lievrite