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Slate was the traditional material of choice for black Go stones in Japan, alongside clamshell for white stones. It is now considered to be a luxury. [38] Pennsylvania slate is widely used in the manufacture of turkey calls used for hunting turkeys.
The jet-black finish is created by the carver rubbing the carving with the oils or polish as it is being created. The natural oils that skin produces are actually responsible for creating the deep black color argillite is known for [7] , although it is also common to coat the argillite with a polish to recreate the jet-black color.
The black slate occurs only at a quarry on a Slatechuck Mountain in the upper basin of Slatechuck Creek, near the town of Skidegate on Graham Island. At one time, around 1900, it was shipped to Victoria for manufacturing; today the Haida have a monopoly on use of the argillite.
The world's biggest consumer of slate is France, followed by the UK, USA and Germany. In 2012, Spain produced more than 580,000 tonnes (570,000 long tons; 640,000 short tons) of slate worth about $380 million. This made it the largest slate producer in the world, followed by China and Brazil. [3]
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The black crystal is garnet, the pink-orange-yellow colored strands are muscovite mica, and the brown crystals are biotite mica. The grey and white crystals are quartz and (limited) feldspar . Metamorphism is the transformation of existing rock (the protolith ) to rock with a different mineral composition or texture .
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