• Webster's Revised Unabridged Dictionary
    • n Inkstone A kind of stone containing native vitriol or sulphate of iron, used in making ink.
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Century Dictionary and Cyclopedia
    • n inkstone Native copperas or iron sulphate (also called iron vitriol and, in mineralogy, melanterite), or a stone containing this substance: used in making ink.
    • n inkstone A slab of slate, sometimes of marble or other stone, used for rubbing down the Chinese and Japanese solid ink known in Europe as India ink, usually made with a gradual slope terminating in a well at one end. Occasionally it is carved around the edge, or has a border of sculpture. See writing-box.
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In literature:

I cannot bring myself to discard inkstone and brush; Now and then I make a new poem.
"More Translations from the Chinese" by Various
As he sets out to create a work, he first brings to hand the essential artistic materials: brush, inkstone, ink, paper.
"Zen Culture" by Thomas Hoover
Up to now, Inkston had not impressed Cynthia Walford very favourably.
"Beaumaroy Home from the Wars" by Anthony Hope

In news:

Italian bathroom design brand Neutra released its new line, Inkstone, this October.