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Starkeyite

Year of discovery: 1956 (Starkey mine, USA), 1987 (Japan)

Locality list: A locality of starkeyite

• MgSO₄,4H₂O
• [Mg²⁺][SO₄]^2-,4H₂O

• Class: Rozenite group
• Class: Sulfate - Hydrate
• Soluble in: Water

• Polymorph: Cranswickite (Monoclinic)

• Mg => Co: Aplowite
• Mg => Zn: Boyleite
• Mg => Mn: Ilesite
• Mg => Fe: Rozenite

• 4H₂O => H₂O: Kieserite
• 4H₂O => 2H₂O: Sanderite
• 4H₂O => 5H₂O: Pentahydrite
• 4H₂O => 6H₂O: Hexahydrite
• 4H₂O => 7H₂O: Epsomite, Alpersite

• Color: Colorless, Pale yellow
• Streak: White
• Luster: Earthy
• Diaphaneity: Translucent-Opaque

• Hardness: 2-3
• Density: 2.0

• System: Monoclinic
• Group: 2/m, P2₁/b
• Lattice: a=5.9, b=13.6, c=7.9, β=9.9