We use cookies to show content based on your preferences. If you continue to browse you accept their use and installation. More information. >

FMF - Friends of Minerals Forum, discussion and message board
The place to share your mineralogical experiences


Spanish message board






Newest topics and users posts
27 Mar-19:47:08 Re: 2 unknowns co-occurring with caledonite, grand reef mine, az (Pete Richards)
27 Mar-16:15:44 Re: 2 unknowns co-occurring with caledonite, grand reef mine, az (Cfrench58)
27 Mar-15:18:59 Re: 2 unknowns co-occurring with caledonite, grand reef mine, az (Alfredo)
27 Mar-14:39:29 2 unknowns co-occurring with caledonite, grand reef mine, az (Cfrench58)
27 Mar-05:21:48 Re: the mim museum in beirut, lebanon (Mim Museum)
27 Mar-05:03:26 Re: trying to find information on rose/pink quartz and tourmaline associations. (Ning)
27 Mar-02:39:50 Re: the mim museum in beirut, lebanon (Tobi)
27 Mar-00:23:28 Re: collection of volkmar stingl (Volkmar Stingl)
26 Mar-00:53:41 Re: collection of volkmar stingl (Volkmar Stingl)
25 Mar-13:32:10 Re: collection of michael shaw (Michael Shaw)
25 Mar-00:25:58 The mizunaka collection - quartz (Am Mizunaka)
23 Mar-13:35:22 Re: collection of firmo espinar (Firmo Espinar)
22 Mar-08:32:28 Re: collection of michael shaw (Michael Shaw)
22 Mar-04:20:41 Re: the mim museum in beirut, lebanon (Mim Museum)
21 Mar-22:49:19 Re: green seam. Looks like it in a state of decay. (Ning)
21 Mar-22:47:40 Re: green seam. Looks like it in a state of decay. (Ning)
21 Mar-22:45:25 Re: green seam. Looks like it in a state of decay. (Ning)
21 Mar-15:34:23 Re: the mizunaka collection - quartz (Am Mizunaka)
21 Mar-14:35:08 Re: jim’s mineral collection (Jim Wilkinson)
21 Mar-14:15:36 The 4th phoenix heritage mineral show (phms) hosted by mineralogical society of arizona (m (Chris Whitney-smith)
21 Mar-04:36:10 Re: the mizunaka collection (Tobi)
21 Mar-04:11:47 Re: jim’s mineral collection (James Catmur)
20 Mar-23:34:15 The mizunaka collection - quartz (Am Mizunaka)
20 Mar-18:13:16 Re: jim’s mineral collection (Jim Wilkinson)
20 Mar-14:06:43 Re: dry gill mine, caldbeck fells, cumbria, uk (Forrestblyth)

For lists of newest topics and postings click here


RSS RSS

View unanswered posts

Why and how to register

Index Index
 FAQFAQ RegisterRegister  Log inLog in
 {Forgotten your password?}Forgotten your password?  

Like
111799


The time now is Mar 28, 2024 05:48

Search for a textSearch for a text   

A general guide for using the Forum with some rules and tips
The information provided within this Forum about localities is only given to allow reference to them. Any visit to any of the localities requires you to obtain full permission and relevant information prior to your visit. FMF is strictly against any illicit activities related to collecting minerals.
Was wondering what this geode was.
  Goto page 1, 2  Next
  Index -> FOR BEGINNERS: What is it? Where is it from?
Like
1


View previous topic :: View next topic  
Author Message

Brandonh




Joined: 12 Jan 2020
Posts: 24
Location: Venic, Florida

View user's profile

Send private message

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:  14440 Time(s)

20191229_213151~2.jpg



20191229_212809~2.jpg
 Mineral: Calcite
 Dimensions: Size of melon to ping pong balls
 Description:
 Viewed:  14429 Time(s)

20191229_212809~2.jpg


Back to top
Reply to topic Reply with quote
Like
   

Bob Harman




Joined: 06 Nov 2015
Posts: 765


Access to the FMF Gallery title=

View user's profile

Send private message

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
Back to top
Reply to topic Reply with quote
Like
   

Brandonh




Joined: 12 Jan 2020
Posts: 24
Location: Venic, Florida

View user's profile

Send private message

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?
Back to top
Reply to topic Reply with quote
Like
   

Tom Tucker




Joined: 03 Dec 2009
Posts: 60
Location: Virginia

View user's profile

Send private message

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
Back to top
Reply to topic Reply with quote
Like
   

Brandonh




Joined: 12 Jan 2020
Posts: 24
Location: Venic, Florida

View user's profile

Send private message

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
 Viewed:  14283 Time(s)

20200112_133822~2.jpg


Back to top
Reply to topic Reply with quote
Like
   

Brandonh




Joined: 12 Jan 2020
Posts: 24
Location: Venic, Florida

View user's profile

Send private message

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
 Viewed:  14263 Time(s)

20200112_133950~2.jpg


Back to top
Reply to topic Reply with quote
Like
   

Brandonh




Joined: 12 Jan 2020
Posts: 24
Location: Venic, Florida

View user's profile

Send private message

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

#2


20200112_134031~2.jpg
 Dimensions: Idk
 Description:
 Viewed:  14268 Time(s)

20200112_134031~2.jpg


Back to top
Reply to topic Reply with quote
Like
   

Brandonh




Joined: 12 Jan 2020
Posts: 24
Location: Venic, Florida

View user's profile

Send private message

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

After


20200112_134112~2.jpg
 Dimensions: Idk
 Description:
 Viewed:  14261 Time(s)

20200112_134112~2.jpg


Back to top
Reply to topic Reply with quote
Like
   

Brandonh




Joined: 12 Jan 2020
Posts: 24
Location: Venic, Florida

View user's profile

Send private message

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

Here's the lot of them


20200112_133735.jpg
 Dimensions: Idk
 Description:
 Viewed:  14255 Time(s)

20200112_133735.jpg


Back to top
Reply to topic Reply with quote
Like
   

Brandonh




Joined: 12 Jan 2020
Posts: 24
Location: Venic, Florida

View user's profile

Send private message

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
 Dimensions: Idk
 Description:
 Viewed:  14258 Time(s)

20200112_134542.jpg


Back to top
Reply to topic Reply with quote
Like
   

Bob Harman




Joined: 06 Nov 2015
Posts: 765


Access to the FMF Gallery title=

View user's profile

Send private message

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
Back to top
Reply to topic Reply with quote
Like
   

Kevin Schofield




Joined: 05 Jan 2018
Posts: 162
Location: Beacon NY

View user's profile

Send private message

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.

_________________
Veni, Vidi, Emi
Back to top
Reply to topic Reply with quote
Like
   

Brandonh




Joined: 12 Jan 2020
Posts: 24
Location: Venic, Florida

View user's profile

Send private message

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.
Back to top
Reply to topic Reply with quote
Like
   

Brandonh




Joined: 12 Jan 2020
Posts: 24
Location: Venic, Florida

View user's profile

Send private message

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

Here is one of cluster


20200112_134130~2.jpg
 Dimensions: Idk
 Description:
 Viewed:  14204 Time(s)

20200112_134130~2.jpg


Back to top
Reply to topic Reply with quote
Like
   

Brandonh




Joined: 12 Jan 2020
Posts: 24
Location: Venic, Florida

View user's profile

Send private message

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

A bunch I collected


20200112_134309.jpg
 Dimensions: Idk
 Description:
 Viewed:  14176 Time(s)

20200112_134309.jpg


Back to top
Reply to topic Reply with quote
Like
   

Brandonh




Joined: 12 Jan 2020
Posts: 24
Location: Venic, Florida

View user's profile

Send private message

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

Last one


20200112_134400.jpg
 Dimensions: Idk
 Description:
 Viewed:  14167 Time(s)

20200112_134400.jpg


Back to top
Reply to topic Reply with quote
Like
   

James Catmur
Site Admin



Joined: 14 Sep 2006
Posts: 1340
Location: Cambridge


Access to the FMF Gallery title=

View user's profile

Send private message

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
Back to top
Reply to topic Reply with quote
Like
   

Brandonh




Joined: 12 Jan 2020
Posts: 24
Location: Venic, Florida

View user's profile

Send private message

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.
Back to top
Reply to topic Reply with quote
Like
   

Bob Harman




Joined: 06 Nov 2015
Posts: 765


Access to the FMF Gallery title=

View user's profile

Send private message

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
Back to top
Reply to topic Reply with quote
Like
   

Brandonh




Joined: 12 Jan 2020
Posts: 24
Location: Venic, Florida

View user's profile

Send private message

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.
Back to top
Reply to topic Reply with quote
Like
   
Display posts from previous:   
   Index -> FOR BEGINNERS: What is it? Where is it from?   All times are GMT - 5 Hours
Page 1 of 2
  Goto page 1, 2  Next  

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum


All pictures, text, design © Forum FMF 2006-2024


Powered by FMF