Geodes

Geodes are geologic formations found throughout the world.  In the United States, the greatest concentration of these individual spheroids is to be found where the Midwestern states of Ohio, Michigan, Illinois, and Indiana come together. In simple terms, a geode is a round rock with an inside cavity lined with crystals of various colors, usually clear as in Quartz or purple as in Amethyst crystals. In formation, these spheroids are either sedimentary or volcanic (or igneous).image

Under volcanic conditions, these rocks were made under tremendous pressure and heat, while sedimentary spheroids slowly formed layer by layer as different combinations of minerals built up a lining with differing colored crystals inside a round cavity.  After a period of time, ideal conditions created different crystalline structures lining the round cavity.

 

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

w

Connecting to %s