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Was wondering what this geode was.
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Brandonh




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PostPosted: Jan 12, 2020 02:27    Post subject: Was wondering what this geode was.  

I found a bunch of geodes while looking for fossils in a new lake that was being dug in Venice, Florida. They were located under a clay shelf with what I'm assuming was an old reef. They are yellowish gold. I believe they are calcite, but was wanting to know the type.
If anyone knows that would be awesome!



20191229_213151~2.jpg
 Mineral: Calcite
 Locality:
Florida, USA
 Dimensions: From size of melon to ping pong ball
 Description:
I have many more pictures if needed
 Viewed:  4529 Time(s)

20191229_213151~2.jpg



20191229_212809~2.jpg
 Mineral: Calcite
 Dimensions: Size of melon to ping pong balls
 Description:
 Viewed:  4517 Time(s)

20191229_212809~2.jpg


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Bob Harman




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PostPosted: Jan 12, 2020 04:27    Post subject: Re: Was wondering what this geode was.  

Not being a Florida expert, I can only hazard a guess based on your photos and what little I know.

I think you have found portions of Calcite cave speleotherms and cave stalactites. These have to do with reefs and sedimentary type caves where they have grown.
Many similar examples come from Citrus County, near the Town of Lecanto, about 100 miles directly North of your find.

Larger intact examples might look like cave structures, but smaller examples including cross sections, and the tips of the structures might resemble geodes which they technically are not.
The central portion of cross sections would be hollow, as they are tube like structures with some poorly formed crystal tips pointed into the central tube hollow.

To test for them basically being calcite, soak one of your lesser examples in vinegar for 10 -15 minutes to see if it fizzes and starts dissolving.

Nice find and hope this helps, Bob
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Brandonh




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PostPosted: Jan 12, 2020 08:24    Post subject: Re: Was wondering what this geode was.  

Thank you very much. This has to be the most insightful answer I have had so far on what they are. If it's alright I would like to share more pictures of what I have found. I really didn't hold back on what was there. Cave formations sounds like a great clue.
Stand by, I will share more pics. I've been very confused on all the different things I have found.

Any idea the name of the calcite?
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Tom Tucker




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PostPosted: Jan 12, 2020 09:51    Post subject: Re: Was wondering what this geode was.  

Brandon, your specimens certainly look like the mineral calcite, but I don't think they have any thing to do with caves or speleothems. More likely they were formed as nodules or concretions , or dare I say it - geodes, but without any quartz exterior rind, perhaps in the clay beds you mentioned. I've been in caves in Florida, with very beautiful calcite formations, and even calcite crystals, but none of them are similar to your rocks. Tom
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Brandonh




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PostPosted: Jan 12, 2020 13:59    Post subject: Re: Was wondering what this geode was.  

Awesome thank you for the response.
I am going to attach additional photos I just took.
I have collected a few of these and get to break them open. I am going to attach a before and after pic.

I really appreciate all the input. I am normally hunting fossils and these just popped up and caught my interest. Maybe I've overlooked them in the past, but never really see much of them in my area.



20200112_133822~2.jpg
 Mineral: Calcite
 Description:
Berfore
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20200112_133822~2.jpg


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Brandonh




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PostPosted: Jan 12, 2020 14:01    Post subject: Re: Was wondering what this geode was.  

After opened


20200112_133950~2.jpg
 Mineral: Calcite
 Dimensions: Idk
 Description:
After
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20200112_133950~2.jpg


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Brandonh




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PostPosted: Jan 12, 2020 14:01    Post subject: Re: Was wondering what this geode was.  

#2


20200112_134031~2.jpg
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Brandonh




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PostPosted: Jan 12, 2020 14:02    Post subject: Re: Was wondering what this geode was.  

After


20200112_134112~2.jpg
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20200112_134112~2.jpg


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Brandonh




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PostPosted: Jan 12, 2020 14:04    Post subject: Re: Was wondering what this geode was.  

Here's the lot of them


20200112_133735.jpg
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20200112_133735.jpg


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Brandonh




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PostPosted: Jan 12, 2020 14:06    Post subject: Re: Was wondering what this geode was.  

Here's one cut w tile saw


20200112_134542.jpg
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20200112_134542.jpg


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Bob Harman




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PostPosted: Jan 12, 2020 14:26    Post subject: Re: Was wondering what this geode was.  

I'll amend my original interpretation of your examples to agree with Tom T.

I agree that they look like calcite nodules. In the broad sense of definitions, they would be considered geodes, but in the strict definition of what a "geode" is, they might not fit.
Anyway that is a matter of definition, not affecting what you have found. Nice finds! Bob
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Kevin Schofield




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PostPosted: Jan 12, 2020 15:51    Post subject: Re: Was wondering what this geode was.  

Brandonh wrote:
Here's one cut w tile saw


Hi Brandon,

these are indeed "concretions". A concretion forms when a small volume of an otherwise unconsolidated sediment preferentially lithifies. Basically the grains become cemented together by a mineral deposited mineralized water flowing through the rock. They tend to be spherical because the cements begin to form in specific places where there is a micro-chemical environment that destabilizes the material in solution, causing it to deposit...it might be a piece of decomposing organic matter for example...and they grow outward from that point. The hollow centres may result from volume changes as the concretion grows because the crystalline material occupies less space than the predecessor sediment. The sawn section you show looks as if there may also have been a degree of desiccation fracturing as the concretion grew (the radial crystal-filled cracks). This suggests that the concretions grew very soon after the sediment was deposited.

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Brandonh




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PostPosted: Jan 12, 2020 18:45    Post subject: Re: Was wondering what this geode was.  

Thank you for taking the time and thorough answer. I appreciate everyone's input, I've been twisting and turning trying to find an answer. I also found some much larger pieces, that I'm guessing are the the same after looking around at the internet for "concretions" . They are bulbous but much larger. I couldn't help myself to grab asuch as I could before they got crushed and turned into a road. The pet shop guy I sell them to will be happy to know.
I will attach a couple pictures.
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Brandonh




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PostPosted: Jan 12, 2020 18:47    Post subject: Re: Was wondering what this geode was.  

Here is one of cluster


20200112_134130~2.jpg
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20200112_134130~2.jpg


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Brandonh




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PostPosted: Jan 12, 2020 18:48    Post subject: Re: Was wondering what this geode was.  

A bunch I collected


20200112_134309.jpg
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20200112_134309.jpg


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Brandonh




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PostPosted: Jan 12, 2020 18:49    Post subject: Re: Was wondering what this geode was.  

Last one


20200112_134400.jpg
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20200112_134400.jpg


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James Catmur
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PostPosted: Jan 13, 2020 05:12    Post subject: Re: Was wondering what this geode was.  

The first ones you posted looked like crystalline calcite while the latter ones looked more like simple limestone nodules. That said they are neat shapes
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Brandonh




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PostPosted: Jan 13, 2020 07:30    Post subject: Re: Was wondering what this geode was.  

Thanks they are pretty cool. I loaded up on them with no goal or plan, but figured I would sort it out.

Can you tell what type of calcite these are? I was told either honey or dogtooth.
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Bob Harman




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PostPosted: Jan 13, 2020 11:21    Post subject: Re: Was wondering what this geode was.  

Brandon H, Your question refers to 2 different things. Dogtooth calcites are steep scalenohedral crystals. Honey calcite, to my knowledge, is a color that calcite crystals can be. So, it would be possible to have honey colored dogtooth calcite crystals. Bob
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Brandonh




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PostPosted: Jan 13, 2020 15:06    Post subject: Re: Was wondering what this geode was.  

Thanks Bob appreciate all your help. I'm new at this minerals, crystal was Rock thing, but I enjoy learning about it. I just wanted to get a good description of these things so I can describe them to friends and family.
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