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Gehlenite [abbr. Gh ]

Year of discovery: 1815 (Monzoni Mountains, Italy), 1949 (Japan)

Locality list: 7 localities of gehlenite

• Ca₂Al₂SiO₇
• [Ca²⁺₂][Al³⁺][AlSiO₇]^7-

• Class: Melilite group
• Class: Soro-Aluminosilicate
• Soluble in: HCl (Gel residue)

• Al => Si: Alumoåkermanite (Alumoakermanite)

• Al₂ => MgSi: Åkermanite (Akermanite) (Series)
• Al₂ => BSi: Gugiaite
• Al₂ => B₂: Okayamalite

• Color: Yellowish brown, Gray
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Cleavage: Good on {001} (1 plane)
• Hardness: 5-6
• Density: 3.0

• System: Tetragonal
• Group: (-4)2/m, P(-4)2₁m
• Lattice: a=7.7, c=5.1

Etymology: A. F. Gehlen, a friend of Swedish chemist Fuchs who is the etymology of fuchsite.