On Sat, 28 Jan 2006 19:49:16 GMT, BottleBob wrote:

Cliff wrote:

On Fri, 27 Jan 2006 13:30:35 GMT, BottleBob wrote:

Do all rocks have a crystalline structure? NO!

Umm ... you may want to rethink that G.

Oh? Why? You've never heard of amphorus (non-crystaline), rock?

You are thinking of glass?

Look up pumice,

"Pumice is actually a kind of glass ..."

Cliff:


In other words a non-crystalline rock.

"You are thinking of glass?"
Is glass a rock?


obsidian,

OBSIDIAN (Volcanic Silica Glass)
"Inclusions of small, white, radially clustered crystals of cristobalite in
the black glass produce a blotchy or snowflake pattern producing Snowflake
Obsidian."

In other words a non-crystalline rock.

"You are thinking of glass?"
Is glass a rock?

scoria,

"Scoria is actually a kind of glass .."

In other words a non-crystalline rock.

"You are thinking of glass?"
Is glass a rock?


opal,

"OPAL (Hydrated Silica Glass)"

In other words a non-crystalline rock.

"You are thinking of glass?"
Is glass a rock?

etc. These ARE considered
"glassy", but my point was that not ALL rocks have a crystalline
structure, to which you seemed to object.

I guess we've resolved your error in thinking that ALL rocks have a
crystalline structure. LOL

"You are thinking of glass?"
Is glass a rock?
--
Cliff