Great Tew Ironstone

Great Tew Ironstone [The MarlstoneRockbed] has a distinctive deep orangebrowncolour with occasional patches of white mineralisation/marbleing and is commonly found throughout the counties of North Oxfordshire, Northamptonshire through to Rutland. Overall the stone is fine grained with some particles having a deep iron-rich colour with others being paler.

Petrographic Description and Mineral Examination

In thin section the stone had a high content of rounded to angular grainules ranging in colour from dark iron-brown to pale orange. Sometimes the grains were
oolitic, with seeds and rims of different composition/texture. These grains were generally well-compacted and often grainsupported. Also present were broken up fossil fragments which appeared to include bryozoan, bivalves, echinoid and crinoid pieces.

A partial carbonate cement is visible throughout the section, with the distribution of this being rather variable. Patches showing a well-developed cement are those areas of the hand specimen appearing white and more resistant. There was also evidence of a fine siliceous/clay matrix in some areas of the section. Based on the mineralogy identified in thin section
and the texture seen in hand specimen, the stone has been given the classification of Ferruginous limestone.

Great Tew Ironstone Wall Jq Group Hq 900x992
Great Tew Ironstone Building Stone Jq Group Scaled 992x661

BRE Test Data

Open Porosity 27.1 % BY VOL. BSEN 1936
Appartent Density 2120 kg/m³ BSEN 1936
Water Absortption [Atmospheric Pressure] 10.70% BSEN 13755
Water Absortption [by Capillarity] 60.5 gm²s-0.5 BSEN 772-11
Compressive Strength 20.4 MPa BSEN 772-11
Compressive Strength [After freeze thaw] 16 MPa BSEN 772-11
Thermal Conductivity [10 dry units] 1.7 W[m.k]-1 BSEN 1745
Reaction to fire A1 BSEN 13501-1

*All comprehensive British and European Standards test data and declaration of performance for CE marking
application are available on request.

Bed Height 300mm – 1200mm
Block Length Up to 4000mm
Block Width Up to 1500mm
Weight X

Looking for more information about Great Tew Ironstone?

Contact our sales team today to discuss your project and see how we can help you. All of our contact details can found on the link below.

Contact Building Stone