Hydromagnesite

Meca Quarry (De l'Àngel Quarry), Can Plans, Gualba, Comarca Vallès Oriental, Barcelona, Catalonia / Catalunya  Spain (1971)

Specimen size: 6 × 5.3 × 3.2 cm = 2.36” × 2.09” × 1.26”
Main crystal size: 0.3 × 0.1 cm = 0.12” × 0.04”