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Aegirine (Photo) [abbr. Aeg ]

Year of discovery: 1834 (Rundemyr, Norway, and Låven, Norway), 1913 (Japan)

Locality list: 73 localities of aegirine

• NaFeSi₂O₆
• (Na,Ca,Mg,Fe²⁺)(Fe³⁺,Al³⁺,Ca,Mg,Fe²⁺)Si₂O₆
• [Na⁺][Fe³⁺][(SiO₃)₂]^4-
• CaMgFe/(CaMgFe+NaAlFe)=0-0.2

• Class: Na pyroxene group < Pyroxene supergroup
• Class: Inosilicate (Single chain)
• Variety: Chrome-acmite (+Cr)

• CaMgFe/(CaMgFe+NaAlFe) > 0.2: Aegirine-augite (Series)

• Fe => Al: Jadeite (Series)
• Fe => Mn: Namansilite
• Fe => Cr: Kosmochlor
• Fe => V: Natalyite
• Fe => Sc: Jervisite

• Color: Dark green ,Brown, Black
• Streak: Pale green
• Luster: Vitreous
• Diaphaneity: Translucent-Opaque

• Habit: Pyramidal, Acicular, Fibours
• Aggregate: Radial

• Cleavage: Perfect on {110} (2 planes, 90 degree)
• Hardness: 6
• Density: 3.6

• System: Monoclinic
• Group: 2/m, B2/b,C2/c
• Lattice: a=9.7, b=8.8, c=5.3, β=107.4

Etymology: Aegire, a god of the sea in the Scandinavian myth

Synonym: Aegirite, Aegyrite, Acmite