ELECTRONIC	h   t   t   p   c o l o n   s l a s h   s l a s h   m i n e r a l s dot u   s   g   s dot g o v   s l a s h   k   b   s l a s h   c l o s i n g   p a r e n t h e s i s	http://minerals.usgs.gov/kb/)	1