Blackjack

From WebRef.org
Jump to navigationJump to search Free WhoisGuard with Every Domain Purchase at Namecheap
  1. A thin stratum of coal interbedded with layers of slate; a slaty coal with a high ash content. AGI
  2. A syn. of sphalerite, esp. a dark variety. See also: sphalerite AGI

Source: Dictionary of Mining, Mineral, and Related Terms


Sponsor: New Fabric -10% Off And Free Shipping On Your First Order!