Found these Pebbles at a lake edge where a Serpentinite belt runs through, there are lots of serpentine pebbles along this lake in Co. Sligo Ireland.

enter image description here enter image description here The larger pebble is 1 5/8'' a Yellowish white color underneath and translucent, and has a tiny pitted surface The smaller pebble is opaque.

  • $\begingroup$ Hi. When I fixed your image links, I noticed that the third picture was the same as the first, so I removed that one. The surfaces of course are due to rounding during transportation. $\endgroup$ – Spencer Oct 20 '18 at 14:22

The white one is milky quartz, the yellowish/brownish one could be some variation of quartz or quartzite, too.

Further information about quartz and milky quartz can be found here

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