Indonesian Agatized Fossil Coral 23-30mm oval beads (ETB00086) Natural stone and the two names are

and the two names are often used interchangeably)

speculariron

Similar to carnelian is sard

Plume agate has fluffy inclusions which often appear to be soft and have depth

The black color of jade comes from high amounts of iron and/or graphite

Indonesian Agatized Fossil Coral 23-30mm oval beads (ETB00086) Natural stone and the two names areFossil Coral Fossil coral is a natural stone that is formed when ancient coral is gradually replaced with agate. The proper name for this material is agatized coral or agatized fossil coral. The fossilized coral typically appears as small flower like patterns in the stone. Agatized fossil coral can exhibit a wide range of natural colors, ranging from white and pink to brown, gray, black, yellow and red. Corals may vary widely within a single stone