Twinned Calcite

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

Specimen size: 5.2 × 3.3 × 2.3 cm = 2.05” × 1.30” × 0.91”
Main crystal size: 2.6 × 1.7 cm = 1.02” × 0.67”