
Septarian is a combination of aragonite (dark brown), calcite (yellow crystals), and limestone (tan outer material). Metaphysically, it has grounding earth energy, brings the feng shui element of wood, and it is a great stone to have around when you need some calming energy.
You may find the nodules intact and smooth, or they may be like the one pictured with part cracked open so you can see the inner crystal structure.