Cryptocrystalline

From WebRef.org
Revision as of 09:34, 24 December 2020 by Webref (talk | contribs)
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to navigationJump to search AnimationFactory.com

a term for glassy rocks which break with a conchoidal fracture, such as obsidian.


Sponsor: Greeting Cards, Art Prints & Gifts from Cornwall