Extreme bright light moving east from west just above height of land thousands of feet below air corridor.single track,no sound,stable

we live in south facing cabin and monitor air traffic over our home and valley.my wife noticed very bright abnormal light traveleing at a fast speed across the sky just above mountain tops.i was able to put binos on for brief moment before it traveled out of view.it had a prism shape of very white light.this was not a commercial aircraft.at the same time as it passed a very high craft traveled south to north over us.this we heard the sonic boom.it was not a civillian aircraft as it traveled to high and too fast.the prism light was completely quite and brighter than any star or aircraft I have ever seen.this was not the space station or satilite.everthing about my sighting I felt was not anything I have seen latley.i have been a canadien ranger and was briefed on reporting these objects.