Are you sure about the hardness? The last pic looks silica-related.
The first one reminded me of marble, but the hardness is wrong for either. So double check, please?
l am use sandpaper and marble grind or polish so hard for me.Knife easy scratch this rocks.Sandpaper make white area yellow stone,polish again yellow (sorry for bad english)
That puts it in the range of being a marble of some type. The grain on the backside and lack of clear cleavage puts it out of range for a calcite though marbles can have high content in that mineral. My thoughts.
That puts it in the range of being a marble of some type. The grain on the backside and lack of clear cleavage puts it out of range for a calcite though marbles can have high content in that mineral. My thoughts.