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Hydrokenoralstonite

Year of discovery: 1871 (Ivigtut deposit, Greenland), 2000 (Japan)

Locality list: 2 localities of Hydrokenoralstonite

• NaMgAlF₆,H₂O
• NaMgAl(F,OH)₆,H₂O
• [Na⁺][Mg²⁺][AlF₆]^3-,H₂O

• Class: Fluoride
• Soluble in: HF (with HF bubbles)
• Formed by alteration of Cryolite.

• Mg => Ca: Thomsenolite, Pachnolite

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

• Cleavage: Imperfect on {111} (4 planes)
• Hardness: 4.5
• Density: 2.6

• System: Cubic
• Group: m3m, Fd3m
• Lattice: a=9.9

Synonym: Ralstonite