Sinus Meridiani
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Sinus Meridiani is an albedo feature on Mars stretching east-west just south of the planet's equator. It was named by the French astronomer Camille Flammarion in the late 1870s.
Sinus Meridiani, seen as the dark region just below the centre of the image at the end of the protrusion from the left (Sinus Sabaeus)
This image shows an arcuate ridge in Terra Meridiani.
Enigmatic ridges in Terra Meridiani from HiRISE, 2012. Terra Meridiani is one of the more complex regions on Mars.
The rock "Berry Bowl."
Hematite
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Hematite, also spelled as haematite, is a common iron oxide compound with the formula Fe2O3 and is widely found in rocks and soils. Hematite crystals belong to the rhombohedral lattice system which is
Sinus Meridiani
…characteristic as a flat and mostly rock-free plain (and hence a safe landing site), and also as a site which showed the spectral signature of the mineral hematite, which is often a sign of deposition in an aqueous environment. The Opportunity rover found that the soil at Meridiani Planum was very similar to the…
Hematite crystals from Brazil
Crystal structure of hematite
Image mosaic from the Mars Exploration Rover Microscopic Imager shows hematite spherules partly embedded in rock at the Opportunity landing site. Image is around 5 cm (2 in) across.
A rare pseudo-scalenohedral crystal habit