Diamond shape in My ophiolites rock?

Could this be a diamond shape in my ophiolite rock i posted about earlier? I found this shape. I keep on getting it dirty with water again when water is on it. I have scraped it with a diamond file trying to get other rock off. It is actually a white stone underneath! Thanks

never mind this is just a rock! I think it is by chance it was oddly shaped!

actually the more I uncover this rock… it has 8 sides. it is a ophiolite rock. I don’t think quartz can be in a ophilotice rock. I am not a expert. But could a shape be like a diamond after all? I got the rock way more cleared off. Way more than the current pictures cleared off rock around it! thanks