Re: [CAD_CAM_EDM_DRO] Digest Number 441

Message: 20
Date: Fri, 7 Apr 2000 18:44:28 EDT
From: Lngknife29@...
Subject: Re: marble and granite

most marble is the same hardness as quartz--that is if it hasnt weathered
too
badly-
and thats a little harder than glass




I don't want to start a flame thing, or anything like that but I must
disagree with this. Marble is never as hard as quartz. Many marbles will
have some deposits of quartz, and, trust me, you know when you found them by
the damage they do to your tools(especially when carving marble).

hardness by mohs scale: marble=3 , granite=5 , quartz=7 , diamond=10

Patrick