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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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Taranakite from
Parwan lava caves, Parwan, Moorabool Shire, Victoria, Australia


Locality type:Cave
Classification
Species:Taranakite
Formula:K3Al5(PO3OH)6(PO4)2 · 18H2O
Comments:The massive white to cream chalky material at Parwan, when examined by X-ray diffraction soon after removal from the cave, consisted of a mixture of poorly crystalline taranakite and a clay mineral, possibly kaolinite.
However after several years the material is now largely X-ray amorphous and it appears the taranakite is unstable when it dries out. The taranakite is the most common mineral at Parwan after the clay, and is associated with most of the other minerals.
Colour:white to cream
Confirmation
Validity:Confirmed
Confirmation Methods:XRD
Associated Minerals Based on Photo Data:
Parwanite2
Montmorillonite1
Montgomeryite1
Data
Mineral Data:Click here to view Taranakite data
Locality Data:Click here to view Parwan lava caves, Parwan, Moorabool Shire, Victoria, Australia
Photo GalleryView Gallery (10 photos)
Data Identifiers
Mindat Occurrence Record ID:67766
Long-form Identifier:1:3:67766:2
GUID (UUID V4):0
Nearest other occurrences of Taranakite
99.4km (61.8 miles) Skipton Caves, Mount Widderin, Skipton, Corangamite Shire, Victoria, Australia
References
 
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