Boracite

Bernburg, Stassfurt, Saxony-Anhalt/Sachsen-Anhalt  Germany

Specimen size: 3 × 2.4 × 1.4 cm = 1.18” × 0.94” × 0.55”
Main crystal size: 0.2 × 0.2 cm = 0.08” × 0.08”