Twinned Calcite

Basalt Quarry, Ambariomiambana, Sambava District, Sava Region  Madagascar (08/2004)

Specimen size: 6.7 × 4 × 3.7 cm = 2.64” × 1.57” × 1.46”
Main crystal size: 4.5 × 3 cm = 1.77” × 1.18”