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
18 Mar-08:12:52 Green seam. Looks like it in a state of decay. (Ning)
18 Mar-06:47:13 Mineralogy & museums 10 - cardiff - 12th-13th august 2024 (Roy Starkey)
18 Mar-02:50:32 Re: collection from dany mabillard (Dany Mabillard)
17 Mar-01:57:58 Re: collection of volkmar stingl (Volkmar Stingl)
15 Mar-14:27:47 Re: collection of philippe durand (Philippe Durand)
15 Mar-13:49:04 Re: collection of firmo espinar (Firmo Espinar)
15 Mar-09:18:42 Re: collection of michael shaw (Michael Shaw)
15 Mar-03:45:43 The mizunaka collection - rhodochrosite (Am Mizunaka)
14 Mar-21:29:31 Re: monthly mineral chronicles, mineral guides and more... (Crocoite)
14 Mar-14:47:27 Re: collection of philippe durand (Jordi Fabre)
14 Mar-13:56:01 Re: collection of philippe durand (Philippe Durand)
14 Mar-11:24:43 Re: collection of philippe durand (Jordi Fabre)
14 Mar-08:55:22 Re: collection of michael shaw (Michael Shaw)
14 Mar-08:44:47 Re: the mim museum in beirut, lebanon (Mim Museum)
14 Mar-07:24:12 Re: collection of volkmar stingl (Volkmar Stingl)
14 Mar-02:30:15 The mizunaka collection - quartz (Am Mizunaka)
14 Mar-02:20:37 Re: collection of volkmar stingl (Tobi)
13 Mar-23:40:08 Re: collection of volkmar stingl (Volkmar Stingl)
13 Mar-14:22:58 Re: don lum collection (Don Lum)
13 Mar-14:02:43 Re: collection of philippe durand (Philippe Durand)
13 Mar-00:57:48 The mizunaka collection - quartz (Am Mizunaka)
12 Mar-07:36:06 Re: can you recommend a lab to analyse specimens (Luiz Oliveira)
11 Mar-16:19:18 Re: collection of philippe durand (Riccardo Modanesi)
11 Mar-15:18:26 Re: collection of philippe durand (Philippe Durand)
11 Mar-15:13:07 Re: collection of philippe durand (Philippe Durand)

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
111630


The time now is Mar 18, 2024 21:38

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.
Dragon Stone / Septarian Concretion
  
  Index -> Off-Topic and Introductions
Like
3


View previous topic :: View next topic  
Author Message

Airborn406




Joined: 11 Aug 2022
Posts: 4
Location: Arkansas

View user's profile

Send private message

PostPosted: Aug 11, 2022 21:40    Post subject: Dragon Stone / Septarian Concretion  

I was wondering if anyone has ever seen a Septarian Concretion that is this large before?
I purchased this stone from a co worker a couple years ago, her husband had found it near a lake in our area while digging a driveway for a new home construction.

This stone is nearly two foot long and a foot wide and weighs 130.30 pounds.

Sits at the end of my waterfall as a conservative piece.



E97C02F7-F735-4E8C-8AA8-1039F1B54377.jpeg
 Mineral: Quartz
 Description:
More of my favorite stones.
 Viewed:  5381 Time(s)

E97C02F7-F735-4E8C-8AA8-1039F1B54377.jpeg


Back to top
Reply to topic Reply with quote
Like
   

Airborn406




Joined: 11 Aug 2022
Posts: 4
Location: Arkansas

View user's profile

Send private message

PostPosted: Aug 11, 2022 21:50    Post subject: Re: Dragon Stone / Septarian Concretion  

Here are a couple of my favorite sandstone finds also.


2595A66F-9AA0-46E3-B47C-461B04EF815A.jpeg
 Description:
 Viewed:  5381 Time(s)

2595A66F-9AA0-46E3-B47C-461B04EF815A.jpeg


Back to top
Reply to topic Reply with quote
Like
   

James Catmur
Site Admin



Joined: 14 Sep 2006
Posts: 1336
Location: Cambridge


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Aug 12, 2022 04:33    Post subject: Re: Dragon Stone / Septarian Concretion  

I largest I ever found was about 1m long. I have no idea how much it weighed as we broke it up looking for crystals (but it took three of us to move it)

Airborn406 wrote:
I was wondering if anyone has ever seen a Septarian Concretion that is this large before?
I purchased this stone from a co worker a couple years ago, her husband had found it near a lake in our area while digging a driveway for a new home construction.

This stone is nearly two foot long and a foot wide and weighs 130.30 pounds.

Sits at the end of my waterfall as a conservative piece.
Back to top
Reply to topic Reply with quote
Like
   

Airborn406




Joined: 11 Aug 2022
Posts: 4
Location: Arkansas

View user's profile

Send private message

PostPosted: Aug 12, 2022 06:03    Post subject: Re: Dragon Stone / Septarian Concretion  

Wow, that is big!
Where was it found?
Back to top
Reply to topic Reply with quote
Like
   

James Catmur
Site Admin



Joined: 14 Sep 2006
Posts: 1336
Location: Cambridge


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Aug 12, 2022 11:45    Post subject: Re: Dragon Stone / Septarian Concretion  

Spain - some of them are far bigger but need a digger to extract

Airborn406 wrote:
Wow, that is big!
Where was it found?
Back to top
Reply to topic Reply with quote
Like
   

Pete Richards
Site Admin



Joined: 29 Dec 2008
Posts: 827
Location: Northeast Ohio


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Aug 13, 2022 06:56    Post subject: Re: Dragon Stone / Septarian Concretion  

In certain middle Paleozoic shales in Ohio, septarian concretions are abundant and reach 2 meters in diameter. They are mineralized with dolomite of several generations, quartz, lesser barite, occasional calcite and whewellite, and uncommon apatite, sphalerite, aragonite, pyrite, and marcasite. Some of these form very nice crystals and fascinating microcrystals, such as elongated, right-angle-bent pyrite crystals.


Septaria 4.JPG
 Description:
relatively small concretions
 Viewed:  5116 Time(s)

Septaria 4.JPG



Septaria 5.jpg
 Description:
concretion as yard ornament
 Viewed:  5129 Time(s)

Septaria 5.jpg



PM1.jpg
 Mineral: Pyrite
 Description:
Huron River near Milan, Ohio
<1 mm, see scale bar in image
 Viewed:  5114 Time(s)

PM1.jpg



_________________
Collecting and studying crystals with interesting habits, twinning, and epitaxy
Back to top
Reply to topic Reply with quote
Like
1
   

James Catmur
Site Admin



Joined: 14 Sep 2006
Posts: 1336
Location: Cambridge


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Aug 13, 2022 07:05    Post subject: Re: Dragon Stone / Septarian Concretion  

I also used to collect smaller (up to 30cm) ironstone ones in Fife, Scotland. They sometimes contained crystals of calcite, dolomite and marcasite
Back to top
Reply to topic Reply with quote
Like
   

Pete Richards
Site Admin



Joined: 29 Dec 2008
Posts: 827
Location: Northeast Ohio


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Aug 13, 2022 07:19    Post subject: Re: Dragon Stone / Septarian Concretion  

Airborn406 wrote:
I was wondering if anyone has ever seen a Septarian Concretion that is this large before?


Now that I look at this picture again, I think that this is not a septarian concretion after all. I think it is a portion of a sedimentary layer with mineralized mud cracks.

The difference is that this is a sedimentary bed feature, a planar structure which might have extended for many meters in the directions of the bedding, but only is a few centimeters thick. The cracks are mostly vertical, and intersect in crude polygons, usually approximately hexagonal.

Septarian concretions, and concretions in general, typically form around a center within a body of sediment, so they usually are subspherical in shape, somewhat thinner in the vertical direction than laterally. The septarian cracks are typically interior to the concretion, and radiate outward from the center (more or less), not reaching the surface except where weathering and alteration of the material composing the concretion (usually carbonates of iron and calcium) have exposed them.

_________________
Collecting and studying crystals with interesting habits, twinning, and epitaxy
Back to top
Reply to topic Reply with quote
Like
2
   
Display posts from previous:   
   Index -> Off-Topic and Introductions   All times are GMT - 5 Hours
Page 1 of 1
    

 
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