Officially registered tartan graphics on this site courtesy of The Scottish Tartans Authority.  Other tartans from talented tartan artists may also be featured.

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Jul 13

International Rock Day

Highland Granite
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Granite Formations
Lochnagar, Scotland
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"Geologists have a saying - rocks remember." ~ Neil Armstrong (1930-2012)

Are you an amateur geologist or "rockhound"? If so, you are in good company. Notable rockhounds include art critic and essayist John Ruskin (1819 -1900), James Smithson (1765-1829), benefactor of the Smithsonian Institution, and author Johann Wolfgang von Goethe (1748-1832) for whom is named the iron mineral goethite. Granite and related marble industries are considered one of the oldest industries in the world, existing as far back as Ancient Egypt. Aberdeen, which is constructed principally from local granite, is known as "The Granite City". Granite is also one of the rocks most prized by climbers, for its steepness, soundness, crack systems, and friction. Curling stones are traditionally fashioned of Ailsa Craig granite. The age of the granite from the Scottish Highlands is estimated to be approximately 585 million years of age!

The scientific study of rocks is called petrology, which is an essential component of geology.   Today is the day to examine or start your own rock collection, be they the more common ones that make up the landscape, or the rarer ones classified as gems.

Granite is an igneous hard, coarse-grained rock making up most of the earth. It consists chiefly of three minerals: quartz, alkali feldspar (which contain alumina and silica) and plagioclase feldspar.  It also contains small amounts of other minerals such as hornblende and biotite mica.  

Granite and related marble industries are considered one of the oldest industries in the world,  existing as far back as Ancient Egypt.  Aberdeen, which is constructed principally from local granite, is known as "The Granite City".

 

Granite is also one of the rocks most prized by climbers, for its steepness, soundness, crack systems, and friction. Curling stones are traditionally fashioned of Ailsa Craig granite. 

The colours in this tartan reflect the imposing scenery when journeying north from Perth to Inverness or through to Royal Deeside, granite being the predominant composition of the surrounding unique hills and  mountains.  The age of the granite from the Scottish Highlands is estimated to be approximately 585 million years of age.

If you are fascinated by rocks, you may enjoy a special facebook page, The Amazing Geologist.  To visit this page, click the granite exposure photograph taken at Lochnagar, in the Grampians of Scotland, about five miles south of the River Dee near Balmoral.