riverrock
fully equipped rock polisher
Member since April 2010
Posts: 1,395
|
Post by riverrock on Oct 24, 2012 8:12:10 GMT -5
|
|
herchenx
Cave Dweller
Member since January 2012
Posts: 3,360
|
Post by herchenx on Oct 24, 2012 8:44:43 GMT -5
it looks like it but it's impossible to say from the photo, you need to do a hardness test and see how it breaks. do you have any smaller pieces that you can pick up? try cracking them together when it is dark and see if you get a spark inside the rock. Quartz will light up inside the rock, typically.
|
|
|
Post by NatureNut on Oct 24, 2012 8:46:41 GMT -5
Either a Quartz or a worn feldspar. Jo
|
|
riverrock
fully equipped rock polisher
Member since April 2010
Posts: 1,395
|
Post by riverrock on Oct 24, 2012 9:05:42 GMT -5
I will try the spark idea. Now i have read the mos scale and still don,t get it. And i goggled the fedspar , it does not look like that. And can,t post any better photos , our new office kitten ate my usb cord to my camera.
|
|
|
Post by NatureNut on Oct 24, 2012 9:11:05 GMT -5
Haha... silly kitty. Sorry, I should have said weathered instead of worn. I've seen weathered feldspar look like that.
|
|
|
Post by susand24224 on Oct 24, 2012 22:24:12 GMT -5
My first reaction was feldspar as well, but I'm not ruling out quartz. Find yourself a piece of known quartz with a sharp edge, break a small corner off the rock, and try to scratch the fresh surface with your quartz piece. If it scratches, it may be feldspar. The outside of the rock looks weathered, so it may not be as "solid" as the inside. Also, if it breaks in flat planes it is likely feldspar; quartz just sort of breaks random.
|
|
Deleted
Deleted Member
Member since January 1970
Posts: 0
|
Post by Deleted on Oct 24, 2012 22:45:15 GMT -5
The surface of a quartz break is shiny even though it is rough or uneven. Once you see a quartz break you will have a really easy time telling if it is quartz. Jim
|
|