Here’s a big 1-meter-wide diabasic dike cross-cutting a leucocratic hornblende granodiorite, part of the highly complex Precambrian crystalline basement rocks of the San Gabriel Mountains, in Bear Creek Canyon, Los Angeles County, California. Fun fact: some British geologists call diabase “dolerite” but at your next party I recommend you use the term “microgabbro” just to mess with people. . . . . #geology #geologist #geologia #earth #rocks #rockhound #rocksandminerals #science #planet #geologyrocks #mineral #minerals #mineralogy #geoscience #planetearth #petrology #dike #igneous #sangabrielmountains #magma #basalt #science #scientist