Vote for your favorite mineral in #MinCup26! - Sphalerite vs. Anorthite
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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Thomsonite-Ca from
Portland Harbour Trust Quarry, Cape Sir William Grant, Portland, Glenelg Shire, Victoria, Australia


Locality type:Quarry
Classification
Species:Thomsonite-Ca
Formula:NaCa2[Al5Si5O20] · 6H2O
Comments:"Thomsonite is the rarest of the zeolites at the Cape Grant quarry, forming globules up to 1.5 mm across. The globules are greyish and translucent, with a greasy lustre and a fibrous radiating structure. On some specimens, white hemispherical aggregates of thomsonite overgrow the more compact botryoidal coatings. Thomsonite may occur with analcime."
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Thomsonite-Ca data
Locality Data:Click here to view Portland Harbour Trust Quarry, Cape Sir William Grant, Portland, Glenelg Shire, Victoria, Australia
Data Identifiers
Mindat Occurrence Record ID:88191
Long-form Identifier:1:3:88191:9
GUID (UUID V4):0
References
Birch, W. D. - Ed. (1989) Zeolites of Victoria. Special Publication No.2. Mineralogical Society of Victoriapp.86-89
 
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