Naked Science Forum

Non Life Sciences => Geology, Palaeontology & Archaeology => Topic started by: cliff taylor on 15/06/2008 20:14:56

Title: Could this crystal be volcanic glass?
Post by: cliff taylor on 15/06/2008 20:14:56

cliff taylor asked the Naked Scientists:

I found a crystal on a beach that looks like glass at where it is broke but has a mineral look on the sides that are not broke but I can cut glass with it but does not effect the stone.

What do you think?

Title: Could this crystal be volcanic glass?
Post by: Bass on 16/06/2008 18:43:13

Quartz perhaps?

Title: Could this crystal be volcanic glass?
Post by: chris on 18/06/2008 08:14:42

What about obsidian (volcanic glass)? Where does that sit on Moh's scale?

Title: Could this crystal be volcanic glass?
Post by: RD on 18/06/2008 09:04:29

Quote

Obsidian has a glassy lustre and is slightly harder than window glass.
Though obsidian is typically jet-black in colour

http://www.britannica.com/eb/topic-424074/obsidian

Title: Could this crystal be volcanic glass?
Post by: thedoc on 18/06/2008 13:13:27

Listen to this question on our podcast by clicking here (http://www.thenakedscientists.com/HTML/podcasts/show/2008.06.15/)

Title: None
Post by: bill on 30/07/2015 23:17:31

crrrrrrrrrrrrrap