In a further search for portlandite amongst the vug minerals of the Scawt Hill contact-zone, attention was drawn to some infillings containing a mineral which had not previously been observed. These infillings, which occur in a larnite-rock carrying melilitewollastonite aggregates of the hybrid zone of the contact, consist of afwillite, portlandite, ettringite, and aggregates of a mineral, the light-greenish colour of which was conspicuous.
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C. E. Tilley (1934) studied this question.
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