Silicified listwanite.

i dont think so. wouldnt it fizz when submerged in HCL?

i have never came across an opal and want to ask how do i start working this nodule. usually i work beryls which i slice with saw or hack with hammer.

That diatom opal is mighty pretty, too. Yellow and milky. Met a gentleman in Hope, ID with multiple  hunks lining his driveway, all over two ft square. Guess you gotta work at the mine to get those crumbs!

40mmx30mmx20mm

red

I have seen common opal boulders up to 7 feet across. Common opal is at times formed in huge pieces. In Washington state I have seen vertical walls of diatomaceous earth pits with solid opal over 30 feet tall and a thousand feet wide.

Found a creek that has water only during rainfalls  that has pebbles of red opal and white-yellow thats stained with iron i suppose dince i found some rust inside when i smashed it. both without matrix on them. is this usual? also can an opal boulder be 200kilos?

   Thanks, but I have all the slabs I need right now.

Could this be hydrogrossular garnet ("transvaal jade")? Cannot show it in photos, but the material just doesn't feel like chalcedony. There's a more waxy feel to it. I'll check the density and come back here.

I posted elsewhere but does anyone have any relatively solid orange slabs available? The orange calcite that I previously tried was more yellow than orange. I havent seen a true orange carnelian. I am looking for slabs to make knife scales so they do not have to be super thick, but that also means being translucent isnt a good quality either.

i have orange beryls if you want