Aegirine is a pretty unusual mineral which can formed as single prismatic Crystal, group cluster, inclusions within Quartz Crystal, or as massive raw form. The green fibrous variety of Aegirine is known as Acmite.
Personally, it is energetically an excellent grounding, balancing, and protective Crystal type, and feel like negativity repellent.
∞ General Metaphysical and Energetic Properties associated with Aegirine:
∞ Crystals Keeper