Affinity with the signs: Gemini.
Beneficial to balance emotions Howlita or Howlite is a stone known for its ability to harmonize us. It is an ideal stone to bring you calm, especially if you have an overactive mind. This stone favors sleep and meditation.
Approximate dimensions: Between 15mm to 20mm
The affinity of the stones with the signs just means that there is potentially more reverberation between them. But it shouldn't be the reason to look for another stone if it looks right to you, regardless of your sign.