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similar to a geode
Radiolarite or radiolarian chert is a high silica sedimentary rock which may be considered a variety of chert
Black is caused by manganese
also known as black hematite
Black Mother of Pearl / MOP 24-29mm handmade flower beads (ETB00359) Bryozoan Coral similar to a geodeMother of pearl, is an organic inorganic composite material produced by some molluscs as an inner shell layer; it is also what makes up the outer coating of pearls. It is strong, resilient, and iridescent. Mother of Pearl is found in some of the more ancient lineages of bivalves, gastropods, and cephalopods. However, the inner layer in the great majority of mollusc shells is porcellaneous, not nacreous, and this usually results in a non iridescent
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