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

FMF English Forum is moderated by John S. White and Peter Megaw
 

Spanish message board






Newest topics and users posts
23 Oct-00:40:31 Re: collecting focuses and how they can change (Jesse Fisher)
22 Oct-23:30:44 Re: help identify these minerals (stumped!!!) (Profpepper)
22 Oct-21:33:26 Re: collecting focuses and how they can change (Jim Robison)
22 Oct-20:41:12 Re: collecting focuses and how they can change (Turbo)
22 Oct-20:16:18 Re: collecting focuses and how they can change (Rweaver)
22 Oct-19:16:14 Re: collecting focuses and how they can change (Peter Megaw)
22 Oct-19:12:26 Re: collecting focuses and how they can change (Peter Megaw)
22 Oct-18:21:54 Re: franjungle collection (Franjungle)
22 Oct-17:43:49 Re: a mineralogical trip through the states of usa - florida (Turbo)
22 Oct-17:29:22 Re: collecting focuses and how they can change (Turbo)
22 Oct-16:45:00 Re: help with identification of rock/mineral (Mineralien)
22 Oct-16:44:20 Re: collecting focuses and how they can change (Peter Megaw)
22 Oct-16:44:11 Re: a mineralogical trip through the states of usa - illinois (Tobi)
22 Oct-16:26:10 Re: help with identification of rock/mineral (Vinoterapia)
22 Oct-15:53:00 Re: help with identification of rock/mineral (Matt_zukowski)
22 Oct-14:49:59 Re: a mineralogical trip through the states of usa - illinois (Turbo)
22 Oct-14:11:09 Re: collecting focuses and how they can change (Lluis)
22 Oct-13:21:22 Re: help with identification of rock/mineral (Mineralien)
22 Oct-12:47:02 Collecting focuses and how they can change (Tobi)
22 Oct-11:53:22 Re: a mineralogical trip through the states of usa - illinois (Jesse Fisher)
22 Oct-11:16:19 Re: a mineralogical trip through the states of usa - illinois (Tobi)
22 Oct-11:08:41 Re: a mineralogical trip through the states of usa - arkansas (Tobi)
22 Oct-09:27:40 Re: help identify these minerals (stumped!!!) (Bob Carnein)
22 Oct-09:20:23 Re: munich show (mineralientage) 2017 (Ploum)
22 Oct-08:40:37 Re: help with identification of rock/mineral (Vinoterapia)

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
34088


The time now is Oct 23, 2017 02:57

Search for a textSearch for a text   

A general guide for using the Forum with some rules and tips
Concrete or pumice
  
  Index -> FOR BEGINNERS: What is it? Where is it from?
Like


View previous topic :: View next topic  
Author Message

Alex D.




Joined: 17 Aug 2017
Posts: 21
Location: Nagoya

View user's profile

Send private message

PostPosted: Sep 11, 2017 08:04    Post subject: Concrete or pumice  

This weekend we went to mino (Japan) to visit an old manganese mine. Sadly we could not reach the mine because the (dirt)road was destroyed by heavy rain. But this was also interesting, cause the river next to the road contained a lot of dirt and rocks from the flood. So we found interesting species.

Still there are a few where I can not put a name on.
Also my first picture is maybe strange to ask, cause it looks like pebbels, mixed with concrete, but the strange thing about it, I can see a 1mm spot of gold on it, and some shiny crystals around and inside. Is this concrete, or stones mixed with pumice?

Please if somebody can help me with this and the other stones.



sample 1.jpg
 Description:
Mino
3 cm
The stone contains 4 smaller round stones, put in a grey pumice-like stone. At first sight it looks like a piece of concrete, but inside I can see a shiny crystal like spots.
 Viewed:  417 Time(s)

sample 1.jpg



sample 1-2.jpg
 Description:
Mino
3 cm
the main reason why I doubt about this stone. In the river I found pumice too, But what's very strange to me is that I can see a flake of gold on it. It is not pyrite, (about 0.7 mm, flat, no cubic shape.) I can not do a streak test because of the size.
 Viewed:  412 Time(s)

sample 1-2.jpg



sample 2-2.jpg
 Description:
Mino
5 cm
I'm just a beginner, but I think this is feldspar, a little orange because of iron. but inside I see clear crystals, not 6-side shape. Is this quartz?
 Viewed:  413 Time(s)

sample 2-2.jpg



sample 3.jpg
 Description:
Mino
3 cm
This rock contains a lot of iron, but the corner contains also quartz. Also around the quartz is a brown-red powder like substance. Iron or manganese?
 Viewed:  412 Time(s)

sample 3.jpg



sample 3-2.jpg
 Description:
Mino
3 cm
same "iron" stone from another angle, hopefully more clear
 Viewed:  414 Time(s)

sample 3-2.jpg



sample 3-3.jpg
 Description:
Mino
3 cm
"iron" stone, another angle
 Viewed:  411 Time(s)

sample 3-3.jpg



sample 4.jpg
 Description:
Mino
5 cm
black rusty color stone, not so heavy, not magnetic. First tought was this was Iron. it has a flat face with shiny black spots, like black paint
 Viewed:  413 Time(s)

sample 4.jpg



sample 4-2.jpg
 Description:
Mino
5 cm
other side of the big rusty stone, clearly the black spots and flat face.
 Viewed:  411 Time(s)

sample 4-2.jpg



feldspar.JPG
 Description:
Mino
7 cm
I think a piece a feldspar. I'm not so interested in the type of stone, but more why there are microscopic holes inside (see next photo)
 Viewed:  394 Time(s)

feldspar.JPG



close up.jpg
 Description:
Mino
7 cm
this is the close up of the piece of "feldspar". if I look closely, I can see randomly holes, about 0.5 mm big. are these airbubbles, or places where soft material was eroded? Or something else? this can help me to identify other stones too
 Viewed:  394 Time(s)

close up.jpg


Back to top
Reply to topic Reply with quote
Like
   

trtlman




Joined: 28 Jun 2011
Posts: 170
Location: Washington


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Sep 20, 2017 16:08    Post subject: Re: Concrete or pumice  

Pumice is super light and floats on water.
_________________
Daniel
Back to top
Reply to topic Reply with quote
Like
   

Alex D.




Joined: 17 Aug 2017
Posts: 21
Location: Nagoya

View user's profile

Send private message

PostPosted: Sep 20, 2017 23:07    Post subject: Re: Concrete or pumice  

Hi, thanks for the hint. but since there are more stones included, it's a little hard to check if the pumice floats. I found pumice on the same spot, and it has the same structure.

Meanwhile I did more research about it, and found it it is concrete. The only strange thing is that I also found gold, quartz and azurite on the concrete stone.



DSC_0074-2.jpg
 Description:
mino
5 cm
i can clearly see a little piece of gold. The silver is actually quartz, but the blue spots I'm not sure. azurite maybe, cause there are also copper mines around. (and they are not residu from the pen)
 Viewed:  229 Time(s)

DSC_0074-2.jpg


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 2006-2017


Powered by FMF