Bret Harte 
A Millionaire of Rough-and-Ready [EPUB ebook] 

There was no mistake this time: he had struck gold at last! It had lain there before him a moment ago—a misshapen piece of brown-stained quartz, interspersed with dull yellow metal; yielding enough to have allowed the points of his pick to penetrate its honeycombed recesses, yet heavy enough to drop from the point of his pick as he endeavored to lift it from the red earth.