Homestake Vein - Sol 2769 (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunar Explorer Italia)

Caption NASA:"This Absolute Natural Color view of a Mineral Vein called "Homestake" comes from the Panoramic Camera (PanCam) on NASA's Mars Exploration Rover Opportunity. The Vein is about the width of a thumb and about 18" (45 centimeters) long. Opportunity examined it in November 2011 and found it to be rich in Calcium and Sulfur, possibly the Calcium-Sulfate mineral Gypsum.
"Homestake" is near the edge of the "Cape York" segment of the Western Rim of Endeavour Crater".