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Yorkstone is a natural sandstone of very high quality, strength and durability which comes from quarries in West Yorkshire. It is perhaps best known for its use as a paving stone and has been used to pave most of the major towns and cities in the UK. The traditional London paving stone is Yorkstone. Yorkstone is also widely used in the construction and building industries and in DIY and gardening projects. As well as paving stone for footpaths, patios and driveways, it is used for stone walling, stone steps, cobbled paving, rockery gardens, and garden stone ornaments.

Yorkstone is sedimentary sandstone formed over 300 million years paving stones period as silt deposited by rivers, and consists of quartz, mica, feldspar, silica, clay and iron oxides. It was first quarried in Yorkshire in medieval times and by the 18th century a large industry had developed quarrying the Yorkstone of the millstone grit and coal measures in West Yorkshire. The first quarries or ‘delves’ were developed in the outcrop on the valley sides and later began to move underground into large chambers or galleries. Deep Yorkstone quarries and mines became possible after the introduction of gins and steam cranes and the earliest shafts were sunk in Hipperholme, close to Halifax in about 1860.

Initially the Yorkstone was used for stone walling, and the traditional local skill of building dry stone walls with Yorkstone continues in Yorkshire to this day. Another early use was for roofing, made from split stones known locally as thackstone or grey slate. Yorkstone’s fame really took off with the need for paving stone in the rapidly expanding towns and cities of the industrial revolution. Its versatility and durability led to its use in a huge range of building projects from footpaths, roads and dry stone walling to churches, cathedrals, bridges, houses and skilfully carved monuments.

The sandstone blocks used for making Yorkstone products are separated into two main categories. One has highly visible sedimentary layers and is used for riven Yorkstone paving and other riven Yorkstone products. The term ‘riven’ comes from riving (splitting) the block apart. This block is referred to as flagrock or flagblock. The second kind of block is more compressed, and the sedimentary layers are not as visible and cannot be riven apart. This type of block is referred to as ashlar block and is used for sawn Yorkstone products such as sawn Yorkstone paving, building masonry and carved ornaments and sculptures.

Published at: Recent Health Articleshttp://recenthealtharticles.org

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