"The pits on Skull Hill may have formed via the erosion of clasts from the rock or scouring by wind," NASA said. "Alternatively, 'Skull Hill' could be an igneous rock eroded from a nearby outcrop ...

A separate theory suggests that the rock formation could be an igneous rock which was formed when lava or magma cooled down millions, or possibly billions, of years ago. Ms Dean explained that t ...

Serabi Gold plc (“Serabi” or the “Company”) (AIM:SRB, TSX:SBI, OTCQX:SRBIF), the Brazilian focused gold mining and development company, is pleased to announce the Company’s first quarter ...

“dacite porphyry intrusive” a silica-rich igneous rock with larger phenocrysts (crystals) within a fine-grained matrix “deposit” is a mineralised body which has been physically delineated ...

Serabi Gold plc (“Serabi” or the “Company”) (AIM:SRB, TSX:SBI, OTCQX:SRBIF), the Brazilian focused gold mining and development company, is pleased to announce the Company’s first quarter production ...

Porphyritic enclaves display a wide range in composition from basalt to andesite, are glass-rich, spherical and porphyritic, and contain large, resorbed, plagioclase phenocrysts in a matrix of ...

For the present study, we collected representative suites of gem materials and rock samples from each mine, documenting the GPS coordinates of each find. By performing argon-argon (40 Ar/ 39 Ar) ...

National Key Laboratory of Deep Oil and Gas, China University of Petroleum (East China), Qingdao 266580, China ...