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Concrete or pumice
  
  Index -> FOR BEGINNERS: What is it? Where is it from?
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Alex D.




Joined: 17 Aug 2017
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Location: Nagoya

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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:  519 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:  515 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:  516 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:  514 Time(s)

sample 3.jpg



sample 3-2.jpg
 Description:
Mino
3 cm
same "iron" stone from another angle, hopefully more clear
 Viewed:  517 Time(s)

sample 3-2.jpg



sample 3-3.jpg
 Description:
Mino
3 cm
"iron" stone, another angle
 Viewed:  514 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:  517 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:  515 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:  497 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:  498 Time(s)

close up.jpg


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trtlman




Joined: 28 Jun 2011
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PostPosted: Sep 20, 2017 16:08    Post subject: Re: Concrete or pumice  

Pumice is super light and floats on water.
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Alex D.




Joined: 17 Aug 2017
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Location: Nagoya

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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:  333 Time(s)

DSC_0074-2.jpg


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