Quartz with hydrocarbon inclusions

Berbes mining area, Berbes, Ribadesella, Comarca Oriente, Principality of Asturias (Asturias)  Spain

Specimen size: 8.7 × 5.4 × 4.1 cm = 3.43” × 2.13” × 1.61”
Main crystal size: 6.8 × 4.8 cm = 2.68” × 1.89”