California’s state rock and minerals

Discuss California’s state rock and minerals; where are their occurrences (you can attach a map); any economic resources? any harmful effect? Important: (if you copy and paste answers you will get a zero, as I use TURNITIN to track your answers); use your own words, please! Equally important, your citation must be from credit sources, such as textbooks, government agencies (.gov), colleges and universities (.edu), or science journals. Other links will not be accepted and you will get a zero! No specific writing style is requested, just pick one (MLA, etc.!)