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Melanophlogite

Year of discovery: 1876 (Giona mine, Italy), 2011 (Japan)

Locality list: 2 localities of melanophlogite

• 46SiO₂,6(N₂,CO₂),2(CH₄,N₂)
• SiO₂,n(C,H,O,N,S)
• [46SiO₂][6N₂][2CH₄]

• Class: Oxide - Clathrate (Type I hydrate)
• Fluorescence: UV excitation (Gray-White)

• N₂ => C₂H₆: Chibaite
• N₂ => C_XH_2X+2: Bosoite
• N₂ => H₂O: Opal

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

• Cleavage: No
• Hardness: 6.5-7
• Density: 2.0

• System: Tetragonal
• Group: 4/mmm, P4₁/nbc
• Lattice: a=26.8, c=13.4