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
22 Apr-07:43:53 Re: the mim museum in beirut, lebanon (Mim Museum)
22 Apr-07:37:41 Re: collection of tobi (Tobi)
22 Apr-06:59:29 Re: in memoriam - george robinson, a man of science, passed away (James Catmur)
22 Apr-04:49:40 Re: in memoriam - george robinson, a man of science, passed away (Carles Millan)
22 Apr-04:27:08 In memoriam - george robinson, a man of science, passed away (Jordi Fabre)
21 Apr-19:05:50 The mizunaka collection - fluorite (Am Mizunaka)
21 Apr-10:18:36 Re: collection of volkmar stingl (Volkmar Stingl)
21 Apr-10:02:41 Re: collection of tobi (Tobi)
21 Apr-07:41:53 Re: collection of tobi (Tobi)
21 Apr-01:06:08 Re: collection of volkmar stingl (Volkmar Stingl)
19 Apr-14:43:38 Re: tsumeb unknown (Cfrench58)
19 Apr-13:49:53 Re: tsumeb unknown (Jordi Fabre)
19 Apr-13:49:47 Re: tsumeb unknown (Roger Warin)
19 Apr-11:39:35 Tsumeb unknown (Cfrench58)
18 Apr-22:18:36 Re: collection of volkmar stingl (Volkmar Stingl)
18 Apr-22:09:29 Re: the mim museum in beirut, lebanon (Volkmar Stingl)
18 Apr-14:47:23 Re: collection from dany mabillard (Dany Mabillard)
18 Apr-14:25:29 Re: collection from dany mabillard (Dany Mabillard)
18 Apr-10:23:19 Re: collection of michael shaw (Michael Shaw)
18 Apr-09:23:31 Re: collection of joseph d'oliveira (Joseph Doliveira)
18 Apr-01:38:56 The mizunaka collection - quartz (Am Mizunaka)
17 Apr-16:31:32 Re: mystery stone, who knows what it is? (Jordi Fabre)
17 Apr-13:20:51 Mystery stone, who knows what it is? (Flubbelyte)
17 Apr-01:49:17 Re: the mim museum in beirut, lebanon (Mim Museum)
16 Apr-09:46:56 Re: locality? (Bob Kerr)

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
112322


The time now is Apr 22, 2024 20:42

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.
Can anyone help me identify the original mineral this pseudomorph?
  
  Index -> What is it? - Where is it from?
Like


View previous topic :: View next topic  
Author Message

Randall




Joined: 14 Dec 2023
Posts: 2
Location: Alabama

View user's profile

Send private message

PostPosted: Dec 15, 2023 16:08    Post subject: Can anyone help me identify the original mineral this pseudomorph?  

I have examples of a hematite pseudomorph from Indian Mountain, Cherokee County, Alabama. The crystals are matte black one to two millimeters. Some terminations seem to be rounded triangles and some crystals in profile look like very fat bow ties. The matrix of the first example is a light tan porous chert with many cavities come with drusy quartz (first picture). Second picture is a close view of one cavity. The third and fourth pictures show the same crystal group on drusy quartz.


20231209_122033c.jpg
 Mineral: Pseudomorphs on matrix
 Locality:
Alabama, USA
 Dimensions: 11.8 x 9.0 x 5.4 cm
 Description:
 Viewed:  2961 Time(s)

20231209_122033c.jpg



20231204_200942c.jpg
 Mineral: Pseudomorph
 Locality:
Alabama, USA
 Dimensions: Field of view is about 24 mm.
 Description:
 Viewed:  2976 Time(s)

20231204_200942c.jpg



1980214.03_pic7b.jpg
 Mineral: Pseudomorph on drusy quartz
 Locality:
Indian Mountain, Cherokee County, Alabama, USA
 Dimensions: Field of view about 24 mm.
 Description:
 Viewed:  2966 Time(s)

1980214.03_pic7b.jpg



20231210_161719c.jpg
 Mineral: Pseudomorph
 Locality:
Indian Mountain, Cherokee County, Alabama, USA
 Dimensions: Field of view about 9 mm.
 Description:
 Viewed:  2936 Time(s)

20231210_161719c.jpg


Back to top
Reply to topic Reply with quote
Like
   

Matt_Zukowski
Site Admin



Joined: 10 Apr 2009
Posts: 707
Location: Alaska


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Dec 16, 2023 03:56    Post subject: Re: Can anyone help me identify the original mineral this pseudomorph?  

Are you sure these are pseudomorphs and not just corroded crystals of some kind. If they are pseudos of some bowtie habit, it could be a zeolite like stilbite, but the pictures don't make me confident at all about this. With just pictures i don't think we can tell you anything definitive.

I recommend you go to a local geology club, or better yet, a local school with a geology department, and show the sample to them.

Good luck.
Back to top
Reply to topic Reply with quote
Like
   

Randall




Joined: 14 Dec 2023
Posts: 2
Location: Alabama

View user's profile

Send private message

PostPosted: Dec 16, 2023 08:52    Post subject: Re: Can anyone help me identify the original mineral this pseudomorph?  

Thank you Matt for replying.
But in the fourth picture there is a hole in the crystal to the right. And in the second picture you can see broken crystals showing the outline of the pseudomorph. Most of the crystals, if not all, are hollow. This is like the hematite pseudomorphs after pyrite found at Graves Mtn. Indian Mtn. was mined for iron ore, but the ore is contaminated by phosphates (strengite, kidwellite, rockbridgeite). Not the type of geology I would expect to find zeolites.
Back to top
Reply to topic Reply with quote
Like
   

James Catmur
Site Admin



Joined: 14 Sep 2006
Posts: 1344
Location: Cambridge


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Dec 16, 2023 09:34    Post subject: Re: Can anyone help me identify the original mineral this pseudomorph?  

Looks like an epimorph or perimorph of something. Find a broken crystal and see if you can work out the form of the mineral the epimorph covered
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: Dec 16, 2023 11:08    Post subject: Re: Can anyone help me identify the original mineral this pseudomorph?  

James Catmur wrote:
Looks like an epimorph or perimorph of something. Find a broken crystal and see if you can work out the form of the mineral the epimorph covered


I agree with James that these look like epimorphs. The original shape seems to be either tetragonal or cubic, so I would guess either pyrite or magnetite that oxidized leaving an epimorph of one of the iron oxides (geothite maybe?)

_________________
Veni, Vidi, Emi
Back to top
Reply to topic Reply with quote
Like
   
Display posts from previous:   
   Index -> What is it? - Where is it from?   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