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Pencil details
Brand: Eagle Pencil Co.
Type: Drawing
Made in: USA
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Interesting note:
Turquoise is an opaque, blue-to-green mineral that is a hydrous phosphate of copper and aluminium, with the chemical formula CuAl6(PO4)4(OH)8·4H2O. It is rare and valuable in finer grades and has been prized as a gem and ornamental stone for thousands of years owing to its unique hue.
Turquoise drawing pencils were made with ferrules and without ferrules.
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