greigite Archives

NASA's Perseverance Mars rover generated this mineral map showing the presence of two minerals – vivianite (purple and pink) and greigite (dull yellow and green) – on the surface of a rock nicknamed "Cheyava Falls." -- NASA

Astrogeology, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Mars, Missions & Hardware, Robotics/Rovers/UAVs, Status Report, Tricorders & Sensors

Mars Perseverance’s PIXL Finds Vivianite, Greigite in Cheyava Falls Sample

by Keith CowingOctober 28, 2025October 29, 2025

The data helped scientists determine the rock contained a potential biosignature, which is a substance or structure that might have a biological origin but requires more data or further study […]

a, Orbital context image with the rover traverse overlain in white. White line and arrows show the direction of the rover traverse from the southern contact between the Margin Unit and Neretva Vallis to the Bright Angel outcrop area and then to the Masonic Temple outcrop area. Labelled orange triangles show the locations of proximity science targets discussed in the text. b, Mastcam-Z 360° image mosaic looking at the contact between the light-toned Bright Angel Formation (foreground) and the topographically higher-standing Margin Unit from within the Neretva Vallis channel. This mosaic was collected on sol 1178 from the location of the Walhalla Glades target before abrasion. Upslope, about 110 m distant, the approximate location of the Beaver Falls workspace (containing the targets Cheyava Falls, Apollo Temple and Steamboat Mountain and the Sapphire Canyon sample) is shown. Downslope, about 50 m distant, the approximate location of the target Grapevine Canyon is also shown. In the distance, at the southern side of Neretva Vallis, the Masonic Temple outcrop area is just visible. Mastcam-Z enhanced colour RGB cylindrical projection mosaic from sol 1178, sequence IDs zcam09219 and zcam09220, acquired at 63-mm focal length. A flyover of this area is available at https://www.youtube.com/watch?v=5FAYABW-c_Q. Scale bars (white), 100 m (a), 50 m (b, top) and 50 cm (b, bottom left). Credit: NASA/JPL-Caltech/ASU/MSSS.

Biosignatures & Paleobiology, Exploration Gear & Tech, Habitable Zones, Imaging & Spectroscopy, Mars, Missions & Hardware, Press Release, Robotics/Rovers/UAVs

Potential Biosignatures Found In An Ancient Mars Lake

by Keith CowingSeptember 11, 2025September 18, 2025

A new study suggests a habitable past and signs of ancient microbial processes on Mars – and Imperial scientists provided crucial context.

greigite

Mars Perseverance’s PIXL Finds Vivianite, Greigite in Cheyava Falls Sample

Potential Biosignatures Found In An Ancient Mars Lake

A New Earth-like Exoplanet Discovered

Curiosity Rover Takes a Close Look at Martian Sulfur Crystals

Unraveling The Building Blocks Of Earth’s Pigments

Astrochemical Study of Early Embedded Discs

A Panspermia Origin For Venus Cloud Life