The bright neon orange glow under black light (UV light) is a classic sign of fluorescent calcite or willemite, but the specific orange color you’re seeing most commonly comes from:

⭐ Fluorescent Calcite (Manganese-activated Calcite)

• Often glows bright orange, pink, or red under short-wave UV light.

• Common in many locations including Franklin, New Jersey; Mexico; and some volcanic areas.

• The texture in a photo looks consistent with a rough, porous calcite specimen.

The item weighs approximately 7.3 lbs

The rock measures approximately 7” x 4” x 3”