Aegirine is a sodium-iron pyroxene known for its deep green to black, slender prismatic crystals.

Titanite is a calcium titanium nesosilicate known for wedge-shaped (sphenoid) crystals and high dispersion that can mimic diamond fire.

Clinozoisite is a calcium-aluminum silicate, closely related to epidote but lacking significant Fe²⁺, giving it lighter colors.

This combination—Aegirine + Titanite + Clinozoisite—suggests a Metasomatically Altered, Alkaline, or Calc-Silicate Environment, often where hot fluids introduce sodium, titanium, and aluminum. Pre-existing mafic minerals (like hornblende or augite) alter to aegirine, titanite grows as a stable accessory mineral whenever calcium + titanium + silica coexist, and clinozoisite forms during metamorphism of plagioclase feldspar or calcic rocks.

Specimens typically show jet-black aegirine blades forming the main structure, honey-brown titanite crystals perched on aegirine, and pale green clinozoisite mats or crystals filling pockets or forming coatings.

The color contrast and crystal definition make these excellent reference specimens.