Guanine
North Chincha Island, Chincha Islands, San Clemente District, Pisco Province, Ica, Peru
Yellow guanine crystals from the type locality (North Chincha Island, Pisco Province, Ica Department, Peru) and only one of the very few known localities worldwide. Original color of guanine is white but it darkens to yellow with exposure to light and time, as many organic compounds. Bodo Unger reported a new material that believed was xanthine in ...
© David Hospital