Vivianite - angew. Mineralogie

Vivianite
VII - Phosphates

Crystal habit of Vivianite

Vivianite

`Name`		`Vivianite` `(Blue Iron Earth)`
`Chemistry`		`Fe²⁺₃[PO₄]₂·8H₂O`
`Hardness`		`1.5 - 2`
`Lustre`		`vitreous, pearly`
`Colour`		`white, colourless, darkens upon air to blue`
`Streak`		`white, changes quickly to indigo blue`
`Density [g/cm³]`		`2.6 - 2.7`
`Crystal habit`		`monoclinic, crystals prismatic, acicular`
`Cleavage, Fracture`		`[010] perfect, fracture splintery`
`other characteristics and occurrences`		`often radiating, fibrous, globular, "kidney-like", often earthy (= blue iron earth)`

© 2004 Büro für angewandte Mineralogie · Dr. Stephan Rudolph · D-47918 Tönisvorst

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