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Hydromagnesite (Photo)

Year of discovery: 1827 (Castle Point, USA), 1973 (Japan)

Locality list: 36 localities of hydromagnesite

• Mg₅(CO₃)₄(OH)₂,4H₂O
• [Mg²⁺₅][(OH)₂|(CO₃)₄]^10-,4H₂O

• Class: Carbonate - Hydroxide
• Soluble in: HCl (with bubbles)
• Fluorescence: Short UV excitation (Green), Long UV excitation (Blue white)

• Mg => Ni: Widgiemoolthalite

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

• Habit: Pointed thin plate
• Aggregate: Amygdalodial

• Cleavage: Perfect on {001} (1 plane), Parting on {100} (1 plane)
• Hardness: 3.5
• Density: 2.2

• System: Monoclinic
• Group: 2/m, P2₁/c
• Lattice: a=10.1, b=8.9, c=8.4, β=114.6