Agate usually forms in rounded nodules
or knobs which need to be sliced open to bring out the internal pattern hidden
in the stone. Most Agate is ugly in its natural state; specimens must be polished to
bring out their full beauty. Much of the Agate sold to collectors has been
treated, in the form of tumbled stones
or polished slabs.
Popular collector forms of Agate include nodules
or geodes
sliced in the middle into two polished cross-sections, or thin slabs
from nodule or geode cross-sections.
https://handmadeworldwide.net/collections/serving-stands/products/leaf-model-two-tiered-gold-service-standing
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