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Both zinc ore Sphalerite and calcium plagioclase feldspar Anorthite have perfect cleavage that will split cleanly if you hit them with a hammer, but only one can claim a larger split of your votes!
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Fasibitikite

A rock subtype
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A fine-grained peralkaline alkali-feldspar-granite, similar to rockallite, containing large amounts of aegirine and riebeckite and characterized by the presence of eucolite.


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Unique IdentifiersHide

Mindat ID:
51242
Long-form identifier:
mindat:1:1:51242:2

Classification of FasibitikiteHide

Mineralogy of FasibitikiteHide

Essential minerals - these are minerals that are required within the classification of this rock:
Eucolite[N(1)N(2)N(3)N(4)N(5)]3[M(1.1)M(1.2)]3[M(2.1)M(2.2)M(2.3)]3-6[M(3)M(4)]Z3[Si24O72]Θ4X(1)X(2)
Feldspar > Alkali FeldsparA subgroup of the Feldspar Group, poor in calcium, and mostly rich in potassium.
Pyroxene > Clinopyroxene > AegirineNaFe3+Si2O6
Riebeckite◻[Na2][Fe2+3Fe3+2]Si8O22(OH)2

Internet Links for FasibitikiteHide

References for FasibitikiteHide

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