Naked Science Forum

Non Life Sciences => Geology, Palaeontology & Archaeology => Topic started by: fandu on 05/08/2009 03:29:06

Title: What Kind of Rock is this?
Post by: fandu on 05/08/2009 03:29:06
Found this rock in the backyard, just curious to what kind it is.

(https://www.thenakedscientists.com/forum/proxy.php?request=http%3A%2F%2F%5Battachment%3D9307%5D%5B%2Fattachment%5D&hash=feb1901f633e5fa0f7a382337c6a7a8c)
Title: What Kind of Rock is this?
Post by: JimBob on 05/08/2009 04:25:12
looks at first glance like quartz. But it could be plagioclase feldspar. The only real crystal surfaces I can see are in the upper left part and it looks like quartz.
Title: What Kind of Rock is this?
Post by: Bass on 05/08/2009 16:37:07
I agree, photo looks like quartz.  Can you give us any more information?  Can you scratch it with a knife? Where it's broken, is the break an irregular surface, or a flat surface?  Is the pink/red color just along fractures?
Title: What Kind of Rock is this?
Post by: Karen W. on 05/08/2009 16:53:07
Quote from: fandu on 05/08/2009 03:29:06
Found this rock in the backyard, just curious to what kind it is.

(https://www.thenakedscientists.com/forum/proxy.php?request=http%3A%2F%2F%5Battachment%3D9307%2Cmsg268109%5D%5B%2Fattachment%5D&hash=e06de1d6d74399d8a05f35d025faf1ad)
IT HAS A PRETTY AMETHYST COLOR UP TOP SIDE WAY...
Title: What Kind of Rock is this?
Post by: fandu on 07/08/2009 01:04:35
It will not scratch with a knife, and I pressed down pretty hard. It has an irregular surface on one side and almost flat on the other.
Title: What Kind of Rock is this?
Post by: JimBob on 07/08/2009 04:12:09
Actually, Karen, I think the color needs to be adjusted on your computer. It is probably rose quartz and probably from a pegmatite.
Title: What Kind of Rock is this?
Post by: Bass on 07/08/2009 04:25:06
Quote from: fandu on 07/08/2009 01:04:35
It will not scratch with a knife, and I pressed down pretty hard. It has an irregular surface on one side and almost flat on the other.

quartz it is then.