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My question is not specifically about identification of this piece of rock. Instead I am focusing on the origin of the scar marks on this rock. I have found this stone in the pebbles in the path. This stone is different from any of the pebbles present nearby. What makes these straight line curves on this stone ? Also what are the yellow dusts on this stone ?

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Update

I found it in our university campus. I am not sure about its origin. Possibly it was there in the sand that was used for building construction. There is no other stone nearby that have similar scar marks or any scar marks at all. Location and Surrounding Pebbles Location and Surrounding Pebbles Adding Photos taken with Flash and using USB port and Blade for scale. enter image description here enter image description here enter image description here enter image description here enter image description here Harder than blade. The unclear glossy line is where I tried to scratch with the blade. enter image description here I have no idea about these marks. However as these lines are all straight lines sometimes it looks like a fossil of a tree that wrapped around the stone for long years. Some of the figures look like some primitive flower like shape.

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Those marks should go straight through the rock, there are two explanations. One those are natural cracks that were filled by crystal, then the rock was weathered into the lump you see. looks like there is also a layer of secondary recrystallization. below is an example of crystal veins in fractured rock. note this type of fracture and filling can even take place with both being the same material.

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Alternatively it is just part of a crystal growth, with many crystallization centers where they meet they form the lines.

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Either way it is a fairly common occurrence. As for what its made of without density and other tests I can't do more than guess.

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  • $\begingroup$ Would crystalization result in intersecting and discontinuous straight lines ? Like the flower like shape, there are concentric lines that vanishes after a point. Is that natural crystalization too ? And can those lines go and bend over the cracks ? $\endgroup$ – Neel Basu Jul 14 '18 at 14:58
  • $\begingroup$ Yes, some more extreme than others.oakrocks.net/… $\endgroup$ – John Jul 14 '18 at 15:18
  • $\begingroup$ I thougth on some kind of weathering source but those lines are too much straigth and with perfect angles. I wpul say this is crystallyzing related. $\endgroup$ – Universal_learner Jul 18 '18 at 4:17
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It seems like the fossils of dinosaur or something like that. Or it is a part of tools that was used by prehistoric man, if this is found true then I must certainly say it was the design they made in tools.

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  • $\begingroup$ Where is the location? $\endgroup$ – Rohit Kapoor Jul 14 '18 at 14:12
  • $\begingroup$ Such an wild guess. What a span. From Dinosaur to prehistoric man. Wow. Jokes apart This doesn't look like artificially scratched. And I don't know how it relates to dinosaur. I am seriously asking for an answer. SE is not the place for sharing jokes. May be there can be another SE for that. If you are serious about our answer please share the reasons for which you came to this conclusion. $\endgroup$ – Neel Basu Jul 14 '18 at 14:16
  • $\begingroup$ Welcome to SE. If you are not sure about answer, you can post your thoughts as comments. Please maintain quality of your answer by validating it scientifically. $\endgroup$ – Neel Basu Jul 14 '18 at 14:19

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