"Activités de comprehensive"

Beautiful, violet-pink cleavage books of this uncommon lithium mica.

Beautiful deep green, prismatic, crystalline spray.

Hardened natural cement of calcium carbonate that binds other material such as gravel, sand, clay, and silt.

Deep purple, cubic crystal cluster.

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

Polished banded slices with colorful translucence.

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

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.