• Webster's Revised Unabridged Dictionary
    • n Tinstone (Min) Cassiterite.
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Century Dictionary and Cyclopedia
    • n tinstone The miners' name for tin dioxid, the principal ore of tin; the cassiterite of the mineralogist.
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In literature:

Veins of quartz, tourmaline and chlorite may traverse the granite, containing tinstone often in workable quantities.
"Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 3" by Various
Changed "tinstone" to "tin-stone" in the footnote on page 110.
"De Re Metallica" by Georgius Agricola