"bouteille de gaz"

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

Spain

China

Sharp, clear to white, single-terminated, tetragonal, ³/₄–1 ¹/₂". India.

Sparkling ¹/₂" single cubic crystal in 1 x 2" matrix. Spain.

China

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

Remarkable display and study piece.

Utah

Feldspar group; blue-green, microcline, triclinic, ³/₄". Colorado.