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Löllingite, Lollingite [abbr. Lo ]

Year of discovery: 1845 (Wolfbau mine, Austria), 1954 (Japan)

Locality list: 24 localities of löllingite

• FeAs₂
• (Fe,Ni)As₂
• [Fe²⁺][As₂]

• Class: Arsenide
• Soluble in: HNO₃
• Magnetism: Paramagnetic (After heating)

• Fe => Os: Omeiite
• Fe => Ru: Anduoite
• Fe => Pt: Sperrylite
• Fe => Co: Safflorite (Series), Clinosafflorite
• Fe => Ni: Rammelsbergite, Pararammelsbergite, Krutovite
• Fe => Cu: Paxite

• As => S: Marcasite, Pyrite
• As => Se: Ferroselite, Dzharkenite
• As => Te: Frohbergite
• As => Sb: Seinäjokite (Seinajokite)

• Color: Silver white
• Streak: Grayish black
• Luster: Metallic
• Diaphaneity: Opaque

• Habit: Prismatic parallel to [001]
• Twin: {011}

• Cleavage: Distinct on {010} and {101} (3 planes)
• Hardness: 5-5.5
• Density: 7.4

• System: Orthorhombic
• Group: mmm, Pnnm
• Lattice: a=5.2, b=5.9, c=3.1

• Never associated with: Pyrite

Etymology: Lölling (Lolling) district, Austria