L216 18th Century polished ammonites on an agate

polished ammonites on an agate base

The silica is precipitated into cracks which are then filled with microcrystalline quartz and the “plates” are often encrusted with druzy quartz

an unusual formalism that creates a candle shaped form ending with a faceted point

18th century Italian painted fragment decorated with mica in matrix and a smokey lemon quartz crystal on a phantom optical calcite base

Lamp Base - 14" h x 4

L216 18th Century polished ammonites on an agate18th century Italian gold leaf fragment decorated with a faceted cut black crystal on a free forming black obsidian mineral with a polished face. Obsidian is a naturally occurring volcanic glass formed when lava extruded from a volcano cools rapidly with minimal crystal growth. It is an igneous rock. Obsidian is produced from felsic lava, rich in the lighter elements such as silicon, oxygen, aluminum, sodium, and potassium. Size: 4. 25" wide x 5" high