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Cymraeg

Wollastonite

Crystal System: Triclinic
Status of Occurrence: Confirmed Occurrence
Distribution: Rare
Chemical Composition: Calcium silicate
Chemical Formula: CaSiO3
Method(s) of Verification: Plas Newydd - EMPA (NMW unpublished data)

Chemical Group:

Geological Context:

Introduction: wollastonite forms by contact metamorphism of impure limestone and in skarns where silica is introduced into limestones. It is associated typically with calcite and other calc-silicate minerals such as diopside, grossular, and vesuvianite.
Occurrence in Wales: wollastonite is known from just one locality in Wales, from the contact zone between the Plas Newydd dyke and impure Carboniferous Limestone. Although smaller dykes cut limestone elsewhere on Anglesey, the considerable width of the Plas Newydd dyke provided sufficient heat to metamorphose the limestone into which it intruded around 60 million years ago.

Key Localities:

References:

There are no references for this specimen.