This rock is a quartzofeldspathic gneiss from Surebridge Mine in Harriman State Park, NY. What’s so cool about this is you can see the hydrothermal process which alters biotite to chlorite. The large brown grain being biotite, and the purple/blue/green in the center being chlorite. (10x XPL)
There is no exercise of the intellect which is not, in the final analysis, useless. A philosophical doctrine begins as a plausible description of the universe; with the passage of the years it becomes a mere chapter- if not a paragraph or a name- in the history of philosophy. In literature, this eventual caducity is even more notorious. The Quixote- Menard told me- was, above all, an entertaining book; now it is the occasion for patriotic toasts, grammatical insolence and obscene de luxe editions. Fame is a form of incomprehension, perhaps the worst.
— Jorge Luis Borges, Pierre Menard, Author of the Quixote (via tapestryofwords)
