Naked Science Forum

Non Life Sciences => Geology, Palaeontology & Archaeology => Topic started by: Titanscape on 30/12/2004 15:44:58

Title: What rock types are black, glossy and are a bubbly, glassy texture?
Post by: Titanscape on 30/12/2004 15:44:58

I found a black rock which fractured brown. It is glassy and has bubbles and sides which show cleavage. I think it is Basalt. It's trivia, but what do you fellows think?

<font color="green">Titanscape</font id="green">

Title: Re: What rock types are black, glossy and are a bubbly, glassy texture?
Post by: pink_person on 30/12/2004 16:52:03

Where do you live, what are you surroundings, an ocean, a stream, a mountain, volcano?  Or did you find this near a bar joint?

Pink

Title: Re: What rock types are black, glossy and are a bubbly, glassy texture?
Post by: neilep on 30/12/2004 19:57:01

quote:

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Originally posted by Titanscape

I found a black rock which fractured brown. It is glassy and has bubbles and sides which show cleavage. I think it is Basalt. It's trivia, but what do you fellows think?

Titanscape

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Bren, can you get a piccy of it on the site ?...I'm sure Exodus can tell us what it is.......could it just be one big happy gloop of caramel ?[:)]

'Men are the same as women...just inside out !'

Title: Re: What rock types are black, glossy and are a bubbly, glassy texture?
Post by: Titanscape on 31/12/2004 15:24:36

I'll take a picture of it now. Here it is 2am January 1 2005. Happy new year.

I found it on an old inland road near an Australian war memorial. An old fashioned rocky Aussie road. Next to the big Hume Highway. This rock may have fallen off a truck 50 years ago. It isn't tar, it's too hard. Near is there was shale or coal and other minerals, but none alike it.

Titanscape

Title: Re: What rock types are black, glossy and are a bubbly, glassy texture?
Post by: chris on 07/01/2005 10:28:45

Sounds like obsidian - volcanic glass.

I look forward to seeing the photo.

chris

"I never forget a face, but in your case I'll make an exception"
 - Groucho Marx

Title: Re: What rock types are black, glossy and are a bubbly, glassy texture?
Post by: Exodus on 09/01/2005 18:29:06

sounds very much like obsidian (volcanic glass) to me. I have some wonderful flow banded obsidian from Mount Teide in Tenerife! Great stuff!