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Gugiaite

Year of discovery: 1983 (Gujia village, China), 1997 (Japan)

Locality list: A locality of gugiaite

• Ca₂BeSi₂O₇
• [Ca²⁺₂][Be²⁺][Si₂O₇]^6-

• Class: Fresnoite group
• Class: Sorosilicate

• Be => Zn: Hardystonite
• Be => Mg: Åkermanite (Akermanite)
• Be => Al: Alumoåkermanite (Alumoakermanite)

• BeSi => Al₂: Gehlenite
• BeSi => B₂: Okayamalite

• Color: Colorless
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent

• Cleavage: Perfect on {010} (2 planes), Distinct on {001} (1 plane), Indistinct on {110} (2 planes)
• Hardness: 5
• Density: 3.0

• System: Tetragonal
• Group: (-4)2m, P(-4)2₁m
• Lattice: a=7.4, c=5.0