True trapiches form where geothermal waters meet a carbonaceous host rock. These fluids are full of the chemicals that lead to gem formation, so seed crystals can form. Then, a type of zoning occurs during mineral growth. The gem ceases to grow along the rough edges of the crystal.

How do Trapiche emeralds form?

How Does a Trapiche Emerald Form? During the formation of an emerald crystal, black carbon impurities may enter the gemstone mix. Because of emerald's hexagonal crystal structure, these impurities may fill in at the crystal junctions, forming a six-point radial pattern.

What is Trapiche quartz?

About Trapiche QuartzHide

Quartz crystals with a central hexagonal trapiche-like pattern around the c-axis. The trapiche-like pattern is made of voids left around a dendritic seed crystal that forms the core of a normal habit quartz crystal.