Naked Science Forum

Non Life Sciences => Geology, Palaeontology & Archaeology => Topic started by: mia531 on 17/08/2012 20:20:48

Title: can someone answer this question about this piece of obsidian please?
Post by: mia531 on 17/08/2012 20:20:48

This piece of obsidian was found and given to me in Sardinia. I am sure that it is obsidian and have also been able to identify that one facet has white 'snowflake' patterns on it. The moss green blobs and the one white blob though-is it part of the stone, is it an organic deposit on top or is it just household paint splashed on it??!!

Title: Re: can someone answer this question about this piece of obsidian please?
Post by: CliffordK on 18/08/2012 00:42:14

Unfortunately you only seem to have uploaded thumbnails, so we have very little detail of your images.

Lichens (http://en.wikipedia.org/wiki/Lichen) are common on rocks, and can come in a variety of colors, forms, and shapes, including some that are rather flat, I think.

Title: Re: can someone answer this question about this piece of obsidian please?
Post by: Bill S on 18/08/2012 17:21:56

Obsidian is prety hard stuff, so and lichen, paint etc should scrape off quite easily.

Title: Re: can someone answer this question about this piece of obsidian please?
Post by: JimBob on 23/08/2012 04:20:14

I  am not so sure it is obsidian  -- aparent 6 fold symmetry on one surface ?? on others. and just to fluffy