Black chalk

Revision as of 11:05, 25 June 2021 by Webref (talk | contribs)
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to navigationJump to search

A bluish-black carbonaceous clay, shale, or slate, used as a pigment or crayon. AGI

Source: Dictionary of Mining, Mineral, and Related Terms

Sponsor: ChargeCard. Best New Travel Accessory for Your Phone