Twinned Calcite

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

Specimen size: 6.5 × 4.5 × 4 cm = 2.56” × 1.77” × 1.57”
Main crystal size: 1.5 × 1.3 cm = 0.59” × 0.51”