Septaria are interesting stones, with no two pieces exactly the same. The various minerals that make up these crystals means that their qualities are quite diverse.
They have a strong Shamanic influence that will strengthen group activities. Their vibration enhances privacy, and they are favorable stones for improving your communication ability.
Each crystal is made up of a combination of different minerals, which makes for a wide variation between each piece.
Within these stones you will find a mixture of minerals, commonly Calcite (the yellow parts), Aragonite (the brown lines) and possibly white (Baryte) or grey (Limestone or Chalcedony), depending on the specific minerals that make up that particular stone.