Guiting Cotswold Stone
Guiting Cotswold block has a distinctive, slightly darker golden or honey colour and a medium grain that’s typical of Cotswold towns and villages. The block sizes are unusually large for a Cotswold quarry with a block height up to two metres and individual sizes up to 14 tonnes, which means it is useful for a wide variety of walling, building and masonry requirements.
Petrographic Description and Mineral Examination
Guiting Cotswold Limestone is orange-brown in colour and consists primarily of ooliths with a number of typically elongated bioclasts. The constituents are held within a coarse carbonate cement and there appeared to be a broad alignment of some of the components. During testing there was no evidence of weathering or deterioration. In thin section, the stone consists of a general assemblage of ooliths, bioclasts and intraclasts with quartz grains forming a notable constituent. Some ooliths show a typical concentric structure but many had a seed consisting of quartz grain, bioclast or intraclast/lithoclast fragnents. Some are also formed around a quartz or feldspar crystal.
Bioclasts consist mainly of echinoid plates, bivalves and gastropods and usually show a rim of micrite around the periphery. Iron minerals are present in small quantities
throughout the section which often give rise to the development of oxides/hydroxides producing the distinctive orange colour to the stone. Based on the mineralogy identified the stone has been given the classification of Oolitic limestone.
BRE Test Data
|Oolitic Limestone [Oosparite]
|25.7% by volume
|Open porosity after thermal resistance
|25.5% by volume
|Water absorption by atmospheric pressure
|9.6% by weight
|Water absorption by capillarity
|Water vapour resistance factor dry
|Water vapour resistance factor wet
|Specific heat capacity
|Reaction to fire
|Flexural strength dry tested perpendicular to
the edges of the planes of anisotropy
|2.0 (1.3) MPa
|Flexural strength after 14 cycles freeze/thaw
|2.0 (1.6) MPa
|Flexural strength dry after 20 cycles thermal
|2.0 (1.4) Mpa
|Breaking load at dowel hole
|Direct airborne sound insulation
*All comprehensive British and European Standards test data and declaration of performance for CE marking
application are available on request.
|300mm – 2000mm
|Up to 4000mm
|Up to 1500mm
|Up to 16 tons
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