Intrusive igneous rock (NO.11.0001)

Find location

Site type

Consumption site

Location

Belgium; West-Vlaanderen; Damme

Site name

Hoeke

Excavation or Survey Team

Prof. Dr. Wim De Clercq and Dr. Roland Dreesen

Additional contextual information

Provenance

Location

Norway

Supposed site(s) of provenance

Additional information

interpreted as a glacial erratic collected from cobble beaches in the Baltoscandian area; the rock derives from the plutonic complex of Larvik (the Larvik Batholith) in the Carboniferous-Permian Oslo graben insouth-eastern Norway

Natural color

silver-blue; light-silvery grey colour

Aged color

Components

composed of quite large crystals of bluish-grey feldspars (alternating layers of alkali feldspar and plagioclases) with nice reflections (silver-blue iridescence or labradorescence)

Texture

coarse crystalline

Structure

Weathering

Diagnostic features

labradorescence; large silver-grey feldspar crystals

Additional information

Sample type

Tool

Artefact information

ballast stone, sample number Ho-28

Inventory number

NO.11.0001

Collection

Archaeological Department, Ghent University

Donating institute/person

Host collection

Other samples available

No

Sample collection method

Archaeological Field Survey

De Clercq et al. 2017

Full reference

De Clercq W., Dreesen  R., Dumolyn J., Leloup W. & Tracht J. 2017. Ballasting the Hanse: Baltoscandian erratic cobbles in the Later Medieval port landscape of Bruges. European Journal of Archaeology 20, 4: 710-736.

Dreesen & De Clercq 2020

Full reference

Dreesen  R. & De Clercq W. 2020. Ballaststenen en hun rol in het voormalige middeleeuwse Brugse havenlandschap. In: De Kock T., De Ceukelaire M. & Van der Star C. (Eds.). Pracht en Praal, 7e Vlaams-Nederlandse natuursteendagen, 12-13 maart 2020, Antwerpen. Professional Papers of the Geological Survey of Belgium, 318: 7-18.