metal stones found in a wood.

[rockpassion]

Bog iron does not have fixed composition. It's a mixture of iron minerals, principally oxyhydroxides and oxides. If it has formed at a depth where anaerobic conditions have prevailed, the most likely secondary mineral to exhibit translucent brown crystals would be siderite (ferrous carbonate.)

Well i discovered proof in the small rocks that they are not bog iron. After studying all the crystals inside the rocks i noiticed that some of them where broken and reveiled striations like a tourmaline crystals, see first photo. And tourmaline like crystals can not form in bog iron because that is a whole diffent formation process. I checked the AI on google. The second photo shows what the broke crystals look like as an example

 

[Red-Coat]

Well i discovered proof in the small rocks that they are not bog iron. After studying all the crystals inside the rocks i noiticed that some of them where broken and reveiled striations like a tourmaline crystals, see first photo. And tourmaline like crystals can not form in bog iron because that is a whole diffent formation process. I checked the AI on google. The second photo shows what the broke crystals look like as an example

Well, I can only comment on what you show me and (reliably) tell me. Neither of those pictures are from your specimen though, are they?

You initially described the crystals as black, then as translucent brown, now you say they're striated. As already said, translucent brown siderite can occur in bog iron and crystallizes in the trigonal crystal system; crystals are rhombohedral in shape, typically with curved and striated faces.

This is a typical habit for siderite, although small crystals as an accessory mineral won't have the same appearance:

Tourmaline of course (and its brown form, dravite) isn't found in the Netherlands (if I recall correctly, that's where you are?)

 

[rockpassion]

Well, I can only comment on what you show me and (reliably) tell me. Neither of those pictures are from your specimen though, are they?

You initially described the crystals as black, then as translucent brown, now you say they're striated. As already said, translucent brown siderite can occur in bog iron and crystallizes in the trigonal crystal system; crystals are rhombohedral in shape, typically with curved and striated faces.

This is a typical habit for siderite, although small crystals as an accessory mineral won't have the same appearance:

View attachment 2215442

Tourmaline of course (and its brown form, dravite) isn't found in the Netherlands (if I recall correctly, that's where you are?)

it is to bad i can not phograph the crystal in the stone then it would be clear. But they are certainly not the shape as in the photo you send en described. And what i ment is that the crystals in my rock have similar apearence as tourmaline crystals but are not tourmaline. Any way these rocks beg to be cutt. to be continued.

 

[Red-Coat]

Well i discovered proof in the small rocks that they are not bog iron. After studying all the crystals inside the rocks i noiticed that some of them where broken and reveiled striations like a tourmaline crystals, see first photo. And tourmaline like crystals can not form in bog iron because that is a whole diffent formation process. I checked the AI on google. The second photo shows what the broke crystals look like as an example

it is to bad i can not phograph the crystal in the stone then it would be clear. But they are certainly not the shape as in the photo you send en described. And what i ment is that the crystals in my rock have similar apearence as tourmaline crystals but are not tourmaline. Any way these rocks beg to be cutt. to be continued.

If you're using AI to assist in identification, then a simple query: "brown striated translucent crystals in bog iron" would have yielded this:

 

[rockpassion]

If you're using AI to assist in identification, then a simple query: "brown striated translucent crystals in bog iron" would have yielded this:

View attachment 2215496

here is a closeup.

 

[Red-Coat]

here is a closeup.

... which is visually consistent with goethite/limonite possibilities in bog iron. This is one of the habits for goethite [picture from R.Weller/Cochise College] but your is obviously heavily weathered: