Murphy Stone

Can you educate me about a Murphy Stone?
It looks like a mountain with rivers flowing down. Very cool.
From what I understand, it is only found near Murphys California, and they are a combination of two types of stone. The grey stone is Limestone and the red/brown is quartz which can vary in colors from more red, orange, or brown. The quartz being harder, the limestone erodes leaving the higher areas of quartz.
 
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