For this smaller mineral, I guess it's calcedony,but I do not know what could be this bigger?This does not react to the muratic, cutting the glass, but I would say it's a little softer than calcedony (a scratch method)? In the background you have a love euphoria(snails)
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Last edited by sashaas on Tue Jun 19, 2018 4:38 am, edited 2 times in total.
My first thought was Marble, but you told us that it scratch glass. Marble can also include some level rich in silicium and the hardness of the rock may be tricky to check.
So my second pick will be between a Quartzite and perhaps a White Granite.
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