Thread: Stone ID, please.

Originally Posted by Vasilis

Then I took a rotating dick, I'm not sure how the machine is called, and things got easier.

They're called helicopters.

Originally Posted by Piet

They're called helicopters.

From the whole post I guess that's the most interesting part....

Vasilis - one of the confusing things about 'marble' is the blanket-use of the term - not all stone called marble is true marble. The word, after all, stems from the greek word that meas glittering stone, so that is hardly 'scientific' enough for our purposes! Travertine is often called a marble for instance, but it is not - its a sedimentary limestone. A more precise definition is a metamorphosed limestone capable of taking a high polish and composed of mainly calcite or dolomite. However, we don't need to know that dolomite is harder than calcite, or any of the infinite variations in between, or even the the variations of natural stones like novaculites, as we have Bushdoctor's notes to go on.

Bushdoctor has a large range of natural hone stones and is very familiar with them. I know that for a fact. He laps them, and lapping can be seen as a test of abrasion resistance, so that clears up any doubts as to the aptitude of the MOHS scale. I know he lapped novaculites. If this stone was easier to lap than he initially thought - he said 'ver soft' and that it took '15 minutes' to lap - then we can be fairly confidant that is not in the same league.

Piet - this also rules out any doubts concerning different peoples takes on natural rocks - Bushdoctor has his own range of rocks to compare this one to, as we know from many of his previous posts on this forum - we can use foreknowledge if it is applicable!

In short the answers to most of the doubts and queries raised are all there in the original post - you only have to take the time to read it carefully

Regards,
Neil

Well, still a mysterious stone, thank you at all for your help, Thank you Neil for share your knowledge with us,

@Adrspach, Sorry, I don't want teas you, but if you can't resist...............

I have understand that you need more pictures of stone in question, but today is too late to take some.

I will try with lemonjuice, like Neil suggest, on back of stone .

No is not beryl and in the pictures you can see the stone on a piece of marble ( Carrara marble )


And thank you again

Here more pics from back and from long and short side. Can this be called laminated ?

Fiddish River, Fiddish River, Fiddish River ( like Yellow River song ).

Not sure, Bushdoctor! It looks like it has cleavage planes in the side photos, and one of the features of laminated marble is the presence of cleavage planes. However, the only other laminated marble I have heard of comes from Rode Island, and this is a mix of marble, slate, and phyllite - the bed of rock is about 3m thick, and has varying thicknesses of sheets (laminations) of the various constituents. Phyllite is a cross between slate and mica schist which is easily split along cleavage planes, slate has the same properties, so I would suppose that a composite of laminated marble would split along the slate/phyllite seams.

Regards,
Neil

Thanks Neil,

I don't post pictures named Fiddish River for the moment, but never say never.

All the best my friend

Did you ever find anything else about this stone?

Originally Posted by Hacker7

Did you ever find anything else about this stone?

If I'm not mistaken, and I doubt I am as I had a thorough conversation and testing with an expert about this type of stones, they are from Wales, apparently an old man owns the area (I think), cuts the stone himself and sells them in his local market or something like that. They can be in the range of ~7k or excellent finishers that can be super smooth and unbelievably fine, and hard or soft. They also come in a variety of dark lines or dots or shades, so many may mistake them for a Llyn Idwal, or TOS if they have only dots instead of lines, and some others might try to sell them for Charnley forest or light colored Thuringians if they don't have these dark lines.

Originally Posted by Vasilis

If I'm not mistaken, and I doubt I am as I had a thorough conversation and testing with an expert about this type of stones, they are from Wales, apparently an old man owns the area (I think), cuts the stone himself and sells them in his local market or something like that. They can be in the range of ~7k or excellent finishers that can be super smooth and unbelievably fine, and hard or soft. They also come in a variety of dark lines or dots or shades, so many may mistake them for a Llyn Idwal, or TOS if they have only dots instead of lines, and some others might try to sell them for Charnley forest or light colored Thuringians if they don't have these dark lines.

Any Idea?