Thank you for your patience while we retrieve your images.
Taken 10-Feb-26


140 of 221 photos
Thumbnails
 
Over time, opal-A may transform to microcrystalline quartz (opal-CT or chalcedony) in older deposits.

Over time, opal-A may transform to microcrystalline quartz (opal-CT or chalcedony) in older deposits.