A type of stone or rock with a rough, bark-like surface texture, or a stone used in processing bark.
Compound of 'bark' and 'stone.' Likely a historical term used in either geology or in the tools/materials associated with bark processing and tanning industries.
Barkstone is such an obscure term that its specific meaning has likely been lost to time—it exists in scattered historical documents but no comprehensive definition survives, showing how specialized industrial vocabularies can fade entirely.
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