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Author Topic:   polonium halos
Adminnemooseus
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Posts: 3974
Joined: 09-26-2002


Message 45 of 265 (484689)
09-30-2008 10:35 PM
Reply to: Message 41 by johnfolton
09-30-2008 9:58 PM


Bose-Einstein condensates are way off-topic
I've hidden a big chunk but not all of the Bose-Einstein condensate part of your message. If you feel you must discuss such things, propose a new topic.
NO REPLIES TO THE ADMIN/MODERATION PORTION OF THIS TOPIC.
Adminnemooseus
-----
Now some non-admin (Minnemooseus) comments:
As I recall, two factors control the grain size of igneous rocks.
1) The cooling rate. Large masses of magma take a long time to cool and thus have larger grain sizes.
2} Volatile content: "Wet" magmas, containing lots of water and other volatile components, solidify to larger crystals. That is why you get ultra-course grained pegmatites. On the other hand (if I recall correctly) obsidians (felsic volcanic glass) have very low volatile components.
Reference for above added 10/2/08: Crystal Sizes and Pegmatite Dikes
Re: Bluescat48's message 40:
Bluescat48 writes:
The halos only occur after the rock has become an outcrop...
I assume you meant to say that the halos only occur after the rock has solidified. Being an outcrop means that the rock is exposed at the surface, which has very little to do with the rocks nature.
Minnemooseus
Edited by Adminnemooseus, : Add link.

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Adminnemooseus
Administrator
Posts: 3974
Joined: 09-26-2002


Message 47 of 265 (484692)
09-30-2008 10:45 PM
Reply to: Message 46 by johnfolton
09-30-2008 10:35 PM


Delete your messages content or get suspended
See my previous message.
Also, this is a science topic in a science forum. Genesis references are also off-topic.
Adminnemooseus

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There used to be a comedian who presented his ideas for a better world, and one of them was to arm everyone on the highway with little rubber dart guns. Every time you see a driver doing something stupid, you fire a little dart at his car. When a state trooper sees someone driving down the highway with a bunch of darts all over his car he pulls him over for being an idiot.
Please make it easy to tell you apart from the idiots. Source

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