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.
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.
scoria,
"Scoria is actually a kind of glass .."
In other words a non-crystalline rock.
opal,
"OPAL (Hydrated Silica Glass)"
In other words a non-crystalline 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
--
BottleBob
http://home.earthlink.net/~bottlbob