Euclase Crystal | Ouro Preto, Minas Gerais, Brazil

Euclase is one of those minerals that serious collectors know and everyone else overlooks — which is exactly what makes a fine example like this one worth paying attention to. This crystal from Ouro Preto, Minas Gerais has a lot going on: a great termination, good blue color zoning, and most notably, a dramatic secondary growth at the base where a second generation of crystal material has developed over the original prism.

That secondary growth is the standout feature here. It's the kind of structural complexity that forms under very specific geological conditions and gives the piece a sculptural quality that a plain, single-generation crystal simply doesn't have.

• Secondary growth: Dramatic overgrowth at the base — a second phase of crystal development over the original prism
• Termination: Great — sharp, well-defined apex
• Color zoning: Good blue zoning visible through the crystal
• Locality: Ouro Preto, Minas Gerais, Brazil — the classic locality for fine euclase
• Form: Natural, uncut specimen

A very nice example of euclase with genuine structural interest beyond just the color.