Depending upon the conditions, either nucleation or growth may be predominant over the other, and as a result, crystals with different sizes and shapes are obtained (Control of crystal size and shape constitutes one of the main challenges in industrial manufacturing, such as for pharmaceuticals).
For the region, see San Fernando Valley. San Fernando is a city located in the San Fernando Valley, in the northwestern region of Los Angeles County, California. It is completely surrounded by the City of Los Angeles.
Santa Clarita, CA. The Santa Clarita Valley is located within Los Angeles County, to the north of the San Fernando Valley. Prominent cities in Santa Clarita include Newhall, Castaic, and Saugus. I have lived in the Santa Clarita Valley from 1960 - recently. My first home was in Saugus, CA in 1960. Most recently I lived in Castaic in 2008.