Naked Science Forum

Non Life Sciences => Geology, Palaeontology & Archaeology => Topic started by: stantiques on 02/08/2010 03:46:41

Title: Yet another what is this rock question.
Post by: stantiques on 02/08/2010 03:46:41

Well my 5 year old found this and we broke it open and found this inside both pieces.  He is very curious about this.  Anyone know what it is?

http://picpaste.com/DSC01964.JPG

Title: Yet another what is this rock question.
Post by: RD on 02/08/2010 06:47:52

Pictures up to 128Kb can be attached to posts in this forum Stantiques ..

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http://picpaste.com/DSC01964.JPG

Title: Yet another what is this rock question.
Post by: RD on 03/08/2010 07:46:19

This is a guess

Quote

Purple ochre and Brown ochre also exist for variant hues. Because of these other hues, the color Ochre is sometimes referred to as Yellow ochre.

http://en.wikipedia.org/wiki/Purple_ochre

Title: Yet another what is this rock question.
Post by: JimBob on 06/08/2010 22:11:14

The rock is a sandstone. The coloring is the result of a water solution passing through the sandstone. I am unsure that the coloring is due to natural causes. It could also be that some industrial chemicals have caused this color.

Fluoride added to a city water supply can react with the calcium in the cement of the sandstone producing the chemical that in mineral form is called Fluorite. It is the one that has the beautiful purple square crystals.

So this could as easily be city water contamination as anything else.