"bouteille de gaz"

Beautiful, blue, hexagonal, sapphire crystals. Average size: 3/8". Madagascar.

Sharp, brown, twinned, orthorhombic, ³/₈– ¹/₂".

Sparkling pale blue transparent crystals in vug-like matrix. Average size: 2" x 2". Madagascar.

Brilliant blue lab-grown copper sulfate crystal group. Average size: 2" x 2". Poland.

Classic staurolite crystal twins in schistose matrix with well-defined crystal form. Average size: 2" x 3". Russia.

Spain

China

China

Choice intergrown crystal groups, many with striated pyritohedral crystal faces. Perfect for classroom study. Average size: 1" x 1". Peru.

Utah