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Epsomite

Epsomite, Epsom salt, or magnesium sulfate heptahydrate, is a hydrous magnesium sulfate mineral with formula MgSO₄·7H₂O. Epsomite crystallizes in the orthorhombic system as rarely found acicular or fibrous crystals; the normal form is as massive... Wikipedia
Color: White, grey, colorless, or pink, greenish
2V angle: Measured: 52°
Birefringence: δ = 0.028
Cleavage: perfect, distinct
Crystal class: Disphenoidal (222); H-M symbol: (2 2 2)
Crystal habit: Acicular to fibrous encrustations
Crystal system: Orthorhombic