fayalite crystal on white cristobalite and black magnetite. specimen from cougar butte, cascade range, california, usa

fayalite iron-rich olivine group cristobalite magnetite mineral texture close-up detail abstract semi-precious raw unpolished stone rock gemstone micro science geology natural pattern precious rough color crystalline crystal macro gem crystallography sparkle mineral art gemology jewelry jewel structure surface background crack multicolor rockhounding collection high magnification extreme microscope micrography microscopy scientific crystal showcase