Jump to content

Found possible Geode or something special


Nicole delacruz

Recommended Posts

Nicole delacruz

So I pulled this off the side of one of our mts thinking I had a geode but it does not look like it. Any ideas or suggestions?

20210329_165650.jpg

20210329_165656.jpg

20210329_165703.jpg

20210329_165719.jpg

20210329_165725.jpg

20210329_165733.jpg

20210329_165744.jpg

Link to post
Share on other sites
Darktooth

Sometimes they form around a fossil. There could be one inside it if you want to whack it with a chisel and hammer.

Link to post
Share on other sites
Ludwigia

According to petrological definition, a geode IS a concretion. They can contain agate, for example, or as mentioned above, fossils. A geode with crystals in a cavity is called a druse. They can also, as appears to be the case here, often simply be filled with sedimentary stone.

  • I found this Informative 2
Link to post
Share on other sites
DPS Ammonite
30 minutes ago, Ludwigia said:

According to petrological definition, a geode IS a concretion. They can contain agate, for example, or as mentioned above, fossils. A geode with crystals in a cavity is called a druse. They can also, as appears to be the case here, often simply be filled with sedimentary stone.


A geode is not a concretion. A concretion is a mass of rock and mineral particles that are cemented together by a mineral or minerals. Calcite, iron oxide and silica are common. Concretions are usually solid.
 

A geode is a rock that can separate from the matrix which contain minerals that are deposited inside a cavity. Geodes are or were at one point hollow.

 

Mindat is a great resource for geological/mineralogical definitions.

 

https://www.mindat.org/glossary/geode

 

https://www.mindat.org/glossary/concretion

  • I found this Informative 2
Link to post
Share on other sites
Sjfriend

A good rule of thumb to give an idea if it is geode is weight. Does it feel like it is an appropriate weight for its size? If very light for its size then good call to cut open with rock saw to see if hollow. If heavy then smack with a hammer and chisel to see if solid or fossil inside. Only one way to know for sure and have a go at it lol

Link to post
Share on other sites
Ludwigia
13 hours ago, DPS Ammonite said:

A geode is not a concretion.

I was just mentioning the accepted, although controversial, petrological definition of geode.

  • Thank You 1
Link to post
Share on other sites
Nicole delacruz

I think it is a concretion thank you for pointing me in the right direction.  

  • I Agree 1
Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Recently Browsing   0 members

    No registered users viewing this page.

×
×
  • Create New...