CRB37CD1: Descriptive text by Carles Curto:
Cubic crystal with hopper faces, with small scalenohedral, doubly terminated Calcite crystals.
San Carlos Mine, La Luz, Municipio Guanajuato, Guanajuato  Mexico (+1986)

Specimen size: 1.7 × 1.2 × 1.0 cm = 0.67” × 0.47” × 0.39”

Main crystal size: 1.2 × 1.2 cm = 0.47” × 0.47”