Naked Science Forum

Non Life Sciences => Geology, Palaeontology & Archaeology => Topic started by: CopperKoda on 26/01/2015 07:51:46

Title: Please help me identify these rocks found in Michigan.
Post by: CopperKoda on 26/01/2015 07:51:46

Possibly quartz or rose quartz?  They are pictured as found in the ground.  [ Invalid Attachment ]

Title: Re: Please help me identify these rocks found in Michigan.
Post by: CliffordK on 26/01/2015 09:18:30

You have a lot of white space in your image.

 [ Invalid Attachment ]

Are your rocks opaque or translucent?  Anything else interesting about them?

I think they're probably agates, assuming they are generally translucent.

Title: Re: Please help me identify these rocks found in Michigan.
Post by: CopperKoda on 26/01/2015 09:38:23

Sorry I had to crop the photo and I am not all that computer savvy [:I]

There are areas in the rocks that are translucent.  Sandpaper makes them more clear and the reddish pink color does not fade when sanded.  There are areas that remind me almost of a "brain" texture. The weight between the two of them is 50 grams.  Thanks!!

Title: Re: Please help me identify these rocks found in Michigan.
Post by: Bill S on 26/01/2015 13:42:14

Based just on appearance, I would think that quartz, with impurities, would be a safe bet.  The fact that you have established that the colouration is not just surface staining does tend to push the diagnosis in the direction of Clifford's agate, but where quartz varieties are concerned there are some well defined specimens and lots of intermediates.