Calcite

Cruz dos Meninos Quarry, Santa Maria, Estremoz, Évora District, Alentejo Region  Portugal

Specimen size: 8.5 × 7.6 × 4.1 cm = 3.35” × 2.99” × 1.61”
Main crystal size: 1.7 × 1.4 cm = 0.67” × 0.55”