Stone in Archaeology Database


Elterwater Slate

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Local Name(s): Elterwater Slate. Example of Elterwater Slate
Stone Group: Metamorphic
Stone Type: Slate
Geology:
Era:   Palaeozoic
Period:   Ordovician
Epoch:   Upper
Geological Sub-Divisons:

Borrowdale Volcanic Group

General Colour Description:

Colour varies from dark olive green, mottled green to pale green.

Hand Specimen Description:

A hard, fine grained, well sorted stone comprising clay minerals and occasional tiny quartz grains.

General Comments:

This stone was originally a tuff, a volcanic ash deposit, it was subsequently metamorphosed to form a 'meta-tuff' slate.

Stone Identifiers: Foliated.
Reacts dilute to HCl? No