Falsterite

A variety of Minerals

What is Falsterite?

Falsterite is a rare phosphate mineral with the formula Ca2MgMn2(Fe0.5Fe0.5)4Zn4(PO4)8(OH)4(H2O)14. It is a pegmatitic mineral, related to the currently approved mineral ferraioloite.

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Falsterite Localities Map

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North ZoneCentral RidgeSouth Basin

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Key Characteristics

Formation of Falsterite

Falsterite was found in Palermo No. 1 pegmatite, North Groton, Grafton County, New Hampshire, US. Co-type locality is pegmatite at Estes quarry, Baldwin, Cumberland County, Maine, US. Falsterite is a product of alteration of triphylite and sphalerite.

Composition of Falsterite

Main features of the crystal structure of falsterite, which is somewhat similar to that of schoonerite, are: chains of FeO6 octahedra, displaying edge-sharing chains of ZnO4 tetrahedra, that display corner-sharing sheets, parallel to {010}, formed by linking the above two types of chains by PO4 tetrahedra slabs formed by linking the sheets with MnO6 octahedra and CaO7 polyhedra The slabs are bridged by dimers of MgO6 octahedra that display edge-sharing. Magnesium-bearing octahedra share edges with zinc-bearing tetrahedra.

Quick Facts

Physical Properties

Color
Greenish blue
Hardness (Mohs)
2
Density
2.837 g/cm³
Streak
Very pale greenish blue

Chemical Properties

Chemical Formula
Ca2MgMn2+2Fe2+2Fe3+2Zn4(PO4)8(OH)4(H2O)14
Elements
Ca, Fe, H, Mg, Mn, O, P, Zn
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