Talk:Scoria
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[edit] INTRUSIVE OR EXTRUSIVE?
The title says my question: is it intrusive or extrusive? (I'm not completely sure by the article because I can't understand the super-scientific stuff. It should be put on more clearly.
Fear The Hams.-- 23:17, 16 April 2007 (UTC)
[edit] MOH'S HARDNESS SCALE
Also, what is it on the Moh's Scale?
Fear The Hams.-- 23:19, 16 April 2007 (UTC)
talc is one, diamond is ten. if you can scratch it with a fingernail it is about three, scratches a copper coin 5, scrtatches steel knife 7 (quartz) Russjass (talk) 17:31, 14 May 2008 (UTC)
