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Cronstedite - 4FeO x 2Fe₂O₃ x 3SiO₂ x 4H₂O

Classification: Silicate
Atomic numbers: 26, 14, 1 & 8
Atomic weight:
Melting point (C): 859
Boiling point (C): >1000
Density (g/cm3): 3.34-3.45
Refractive index (n=): 1.80
Hardness (Mosh-scratch): 3.5
Crystal structure: Monoclinic-normal: (hkO) prism
Color (solid): Brown/brownish
Cleavage: Basal-perfect: (001)