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
25 Sep-16:50:53 Re: kamar safed emerald mine in panjshir, afghanistan (Fiebre Verde)
25 Sep-15:05:55 Re: kamar safed emerald mine in panjshir, afghanistan (Josele)
25 Sep-12:28:55 Re: kamar safed emerald mine in panjshir, afghanistan (Fiebre Verde)
25 Sep-09:19:56 Re: will barite save the world? (John Hodgson)
25 Sep-05:41:59 Re: kamar safed emerald mine in panjshir, afghanistan (Josele)
25 Sep-05:08:28 Kamar safed emerald mine in panjshir, afghanistan (Josele)
25 Sep-02:13:49 Re: quartz and epidote with possible hedenbergite from imilchil, morocco (Jordi Fabre)
24 Sep-14:45:17 Re: collection of fiebre verde (panjshir #42) (Fiebre Verde)
24 Sep-12:13:18 Re: will barite save the world? (James Catmur)
24 Sep-12:02:31 Re: quartz and epidote with possible hedenbergite from imilchil, morocco (Adam)
24 Sep-12:01:39 Re: quartz and epidote with possible hedenbergite from imilchil, morocco (Adam)
24 Sep-10:26:29 Re: will barite save the world? (Lluis)
24 Sep-09:25:28 Re: collection of firmo espinar (Firmo Espinar)
24 Sep-08:56:43 Re: will barite save the world? (Pete Richards)
24 Sep-08:53:13 Re: will barite save the world? (Matt_zukowski)
24 Sep-08:38:19 Re: will barite save the world? (Amir Akhavan)
24 Sep-08:30:04 Re: will barite save the world? (Amir Akhavan)
24 Sep-08:27:05 Re: will barite save the world? (Amir Akhavan)
24 Sep-08:25:32 Re: will barite save the world? (Lluis)
24 Sep-07:32:29 Re: quartz and epidote with possible hedenbergite from imilchil, morocco (Adam)
24 Sep-06:58:22 Re: quartz and epidote with possible hedenbergite from imilchil, morocco (Jordi Fabre)
23 Sep-20:42:49 Re: will barite save the world? (Bob Kerr)
23 Sep-19:04:43 Re: will barite save the world? (John Hodgson)
23 Sep-17:32:46 Re: quartz and epidote with possible hedenbergite from imilchil, morocco (Adam)
23 Sep-16:33:54 Re: will barite save the world? (Alfredo)

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
84919


The time now is Sep 26, 2021 05:30

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.
Long time listener.. first time caller. Gifted from underground coal mine
  
  Index -> FOR BEGINNERS: What is it? Where is it from?
Like
1


View previous topic :: View next topic  
Author Message

LoveAlwaysBlake




Joined: 27 Nov 2020
Posts: 10
Location: Indiana

View user's profile

Send private message

PostPosted: Nov 29, 2020 18:37    Post subject: Long time listener.. first time caller. Gifted from underground coal mine  

Hi everyone.

My husband works at an underground coal mine in Southern Indiana and always brings me neat things home. There was a fall last week and he brought me home my first (like 50 pcs) of what I assume is just quartz? I want to be sure there's nothing too rare or special about these before i try to clean and cut into it. Im a beginner.. like this will be the 2nd time I try to cut. He keeps telling me how old it is and its making me super nervous (but I'm more excited to mess with it honestly). Any help appreciated! Thanks everyone.



20201129_174429.jpg
 Mineral: Quartz?
 Description:
Sunrise Coal Oaktown IN
1 cm
 Viewed:  1957 Time(s)

20201129_174429.jpg


Back to top
Reply to topic Reply with quote
Like
   

Pete Richards
Site Admin



Joined: 29 Dec 2008
Posts: 752
Location: Northeast Ohio


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Nov 29, 2020 19:01    Post subject: Re: Long time listener.. first time caller. GIFTED FROM UNDERGROUND COAL MINE  

Is this one thing or two things? The brownish stuff - is it attached to the white stuff behind it?

From your photo, I would say that the brown stuff is pyrite - fool's gold - an iron sulfide. The white stuff behind it appears to be quartz.

There is nothing of great value here, so if you want to try cutting it, go ahead and have fun.

If I am right about the brown stuff being pyrite, it will probably color the cutting water black as you cut it. Both it and the quartz are brittle, so fracturing is quite possible. Watch out for glass-sharp shards from the quartz.

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

Bob Carnein




Joined: 22 Aug 2013
Posts: 250
Location: Florissant, CO


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Nov 29, 2020 19:02    Post subject: Re: Long time listener.. first time caller. GIFTED FROM UNDERGROUND COAL MINE  

This appears to be calcite, but there are both white parts and brown parts in your photo. You can do several things to test it. Break a piece off and see whether it breaks into diamond-shaped pieces, sort of "squashed cubes" (your photo looks like it will). Second, heat some vinegar and crush a bit of the sample. Dump it into the vinegar, and, if it's calcite, it will "fizz". Third, try the hardness with a pocket knife. Calcite is a lot softer than steel.
Back to top
Reply to topic Reply with quote
Like
1
   

LoveAlwaysBlake




Joined: 27 Nov 2020
Posts: 10
Location: Indiana

View user's profile

Send private message

PostPosted: Nov 29, 2020 19:02    Post subject: Re: Long time listener.. first time caller. GIFTED FROM UNDERGROUND COAL MINE  

pic 2


20201129_174523.jpg
 Mineral: Quartz?
 Description:
Sunrise Coal Oaktown IN
1 cm
 Viewed:  1929 Time(s)

20201129_174523.jpg



20201129_174633.jpg
 Mineral: Quartz?
 Description:
Sunrise Coal Oaktown IN
1 cm
 Viewed:  1938 Time(s)

20201129_174633.jpg


Back to top
Reply to topic Reply with quote
Like
   

LoveAlwaysBlake




Joined: 27 Nov 2020
Posts: 10
Location: Indiana

View user's profile

Send private message

PostPosted: Nov 29, 2020 19:03    Post subject: Re: Long time listener.. first time caller. GIFTED FROM UNDERGROUND COAL MINE  

Sorry I was trying to attach the other pics. This is 4 or 5 pieces yes!
Back to top
Reply to topic Reply with quote
Like
   

LoveAlwaysBlake




Joined: 27 Nov 2020
Posts: 10
Location: Indiana

View user's profile

Send private message

PostPosted: Nov 29, 2020 19:04    Post subject: Re: Long time listener.. first time caller. GIFTED FROM UNDERGROUND COAL MINE  

Bob Carnein wrote:
This appears to be calcite, but there are both white parts and brown parts in your photo. You can do several things to test it. Break a piece off and see whether it breaks into diamond-shaped pieces, sort of "squashed cubes" (your photo looks like it will). Second, heat some vinegar and crush a bit of the sample. Dump it into the vinegar, and, if it's calcite, it will "fizz". Third, try the hardness with a pocket knife. Calcite is a lot softer than steel.


Thank you! Will do!!
Back to top
Reply to topic Reply with quote
Like
   

LoveAlwaysBlake




Joined: 27 Nov 2020
Posts: 10
Location: Indiana

View user's profile

Send private message

PostPosted: Nov 29, 2020 19:07    Post subject: Re: Long time listener.. first time caller. GIFTED FROM UNDERGROUND COAL MINE  

Pete Richards wrote:
Is this one thing or two things? The brownish stuff - is it attached to the white stuff behind it?

From your photo, I would say that the brown stuff is pyrite - fool's gold - an iron sulfide. The white stuff behind it appears to be quartz.

There is nothing of great value here, so if you want to try cutting it, go ahead and have fun.

If I am right about the brown stuff being pyrite, it will probably color the cutting water black as you cut it. Both it and the quartz are brittle, so fracturing is quite possible. Watch out for glass-sharp shards from the quartz.


Yes, its attached on some pieces.
Back to top
Reply to topic Reply with quote
Like
   

B.




Joined: 06 Nov 2015
Posts: 754

View user's profile

Send private message

PostPosted: Nov 29, 2020 22:21    Post subject: Re: Long time listener.. first time caller. GIFTED FROM UNDERGROUND COAL MINE  

I would like to set the identification record straight for what you are showing.

For the record, I have collected Indiana minerals for 40 years and I live in Bloomington, IN. My wife's whole family is from SW Indiana, near Princeton, so we are abundantly familiar with the coal mining industry where you live.

The whitish mineral that you have is calcite. It is abundant, as seams, in the sedimentary limestone and shale near to the coal seams. Other than in geodes in south central Indiana, there is no quartz down there in SW Indiana including in the coal mines. Calcite is your whitish mineral.

The brown colored "mineral" looks much more like calcite covered by a very thin layer of dried oil.......bitumen. If you break a piece, the fresh break will look white like the calcite you show. Look closely at the last photo above. In the chipped areas, you can see where the brown color is just a thin coating rather than a discreet crystal-like mass.
Bitumen is dried oil.......remember that there are oil wells near to you in SW Indiana as well. Bitumen covers the surface of lot of the rock, including calcite, facing fissures and small cavities. Occasional small deposits of oil are commonly found in the limestone cavities in southern Illinois and coal mining areas of SW Indiana. BOB
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 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 2006-2021


Powered by FMF