Completely dumb luck. Bought my house more than 20 yrs ago. Had no interest in geology or minerals at the time. I'm a computer guy by trade. Was 10 years or thereabouts before I even took a close look at the "stream" in my back yard.
Below are cool metamorphosed silica-based rocks from my stream. Super heavy. Lots of iron oxides along with sulfides of various kinds. Great for polishing!