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Sylvite [abbr. Syl ]

Year of discovery: 1832 (Monte Vesuvius, Italy), 1951 (Japan)

Locality list: 5 localities of sylvite

• KCl
• [K⁺][Cl]^-

• Class: Halite group
• Class: Chloride
• Soluble in: Water
• Insoluble in: HCl
• Radioactive: Moderate
• Taste: Saline, Bitter
• Formed by hydration of Carnallite with Bischofite.
• Deliquescent

• K => Na: Halite
• K => Ag: Chloraragyrite
• K => Cu: Nantokite
• K => NH₄: Salammoniac
• K => Tl: Lafossaite
• K => Hg: Calomel

• Cl => F: Carobbiite

• Color: Colorless. Impurity and strain cause various color.
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Habit: Cubic

• Cleavage: Perfect on {001} (3 planes)
• Hardness: 1.5-2
• Density: 2.0

• System: Cubic
• Group: m3m, Fm3m
• Lattice: a=6.3

Synonym: Sylvine