About the Trigonal Crystal System
The Trigonal system is one of the seven classical crystal systems used in mineralogy to classify how atoms are arranged in a lattice. three-fold axis; the most common system for collectible quartz, calcite, and corundum. Practitioners are not, as a rule, trained crystallographers, but a working knowledge of the systems repays attention: stones that share a system tend to share a quality of presence, and the symmetry of the lattice often shows up in how the stone behaves on the working tray and in the hand.
Below is a working list of the stones in our library that crystallize in the Trigonal system. They are otherwise quite different, different colors, different chakras, different traditional uses, but they share an underlying geometry. Some practitioners deliberately build small grids using only stones from one system; the grids tend to feel particularly cohesive, even when the stones are mismatched in colour or in intention.
Stones in the Trigonal System
The library includes 41 profiled stones in this system.
Why the System Matters
The system is the deep architecture of the stone. Two stones from the same system, even when they look entirely different, often respond to similar care and behave similarly under cleansing. Many practitioners learn to recognize stones partly by feel, and that feel is in large part a recognition of the underlying lattice. Working with one system at a time for a fortnight is a quiet way to deepen the relationship.
For a wider view of related stones and practices, see our crystal library, the chakra reference, and our list of working intentions.
Editorially recommended companion read: a working practitioner's notes on this topic.