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.
It includes Marin County, Alameda County, The City and County of San Francisco, Contra Costa County, Napa County, Sonoma County, Santa Clara County and San Mateo County. For the most part, Silicon Valley is the Southern-most three of these; Santa Clara, San Mateo and perhaps Alameda Counties.