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These can be interpreted as desiccation cracks, filled with calcium- and/or magnesium sulfate (Ca-/Mg-SO₄).

Methods used, for brevity citing from the below pop science link:

"... The team took a close physical and chemical look at those polygons using Curiosity's Mastcam, Mars Hand Lens Imager, ChemCam Laser Induced Breakdown Spectrometer (LIBS), and Alpha-Particle X-Ray Spectrometer (APXS) ..."

I believe this setting has led to the hypothesis of a once dried out lake on Mars.

https://sciencesources.eurekalert.org/pub_releases/2018-04/gsoa-cam041918.php

https://www.jpl.nasa.gov/news/mars-rover-curiosity-examines-possible-mud-cracks

These can be interpreted as desiccation cracks, filled with calcium- and/or magnesium sulfate (Ca-/Mg-SO₄, seen as white material).

Methods used, for brevity citing from the below pop science link:

"... The team took a close physical and chemical look at those polygons using Curiosity's Mastcam, Mars Hand Lens Imager, ChemCam Laser Induced Breakdown Spectrometer (LIBS), and Alpha-Particle X-Ray Spectrometer (APXS) ..."

I believe this setting has led to the hypothesis of a once dried out lake on Mars.

https://sciencesources.eurekalert.org/pub_releases/2018-04/gsoa-cam041918.php

https://www.jpl.nasa.gov/news/mars-rover-curiosity-examines-possible-mud-cracks

These can be interpreted as desiccation cracks, filled with calcium- and/or magnesium sulfate (Ca-/Mg-SO₄), white being calcium sulfate.

Methods used, for brevity citing from the below pop science link:

"... The team took a close physical and chemical look at those polygons using Curiosity's Mastcam, Mars Hand Lens Imager, ChemCam Laser Induced Breakdown Spectrometer (LIBS), and Alpha-Particle X-Ray Spectrometer (APXS) ..."

I believe this setting has led to the hypothesis of a once dried out lake on Mars.

https://sciencesources.eurekalert.org/pub_releases/2018-04/gsoa-cam041918.php

https://www.jpl.nasa.gov/news/mars-rover-curiosity-examines-possible-mud-cracks

These can be interpreted as desiccation cracks, filled with calcium- and/or magnesium sulfate (Ca-/Mg-SO₄).

Methods used, for brevity citing from the below pop science link:

"... The team took a close physical and chemical look at those polygons using Curiosity's Mastcam, Mars Hand Lens Imager, ChemCam Laser Induced Breakdown Spectrometer (LIBS), and Alpha-Particle X-Ray Spectrometer (APXS) ..."

I believe this setting has led to the hypothesis of a once dried out lake on Mars.

https://sciencesources.eurekalert.org/pub_releases/2018-04/gsoa-cam041918.php

https://www.jpl.nasa.gov/news/mars-rover-curiosity-examines-possible-mud-cracks

These can be interpreted as desiccation cracks, filled with calcium- and/or magnesium sulfate (Ca-/Mg-SO₄), white being calcium sulfate. I believe this setting has led to the hypothesis of a once dried out lake on Mars.

https://sciencesources.eurekalert.org/pub_releases/2018-04/gsoa-cam041918.php

https://www.jpl.nasa.gov/news/mars-rover-curiosity-examines-possible-mud-cracks

These can be interpreted as desiccation cracks, filled with calcium- and/or magnesium sulfate (Ca-/Mg-SO₄), white being calcium sulfate.

Methods used, for brevity citing from the below pop science link:

"... The team took a close physical and chemical look at those polygons using Curiosity's Mastcam, Mars Hand Lens Imager, ChemCam Laser Induced Breakdown Spectrometer (LIBS), and Alpha-Particle X-Ray Spectrometer (APXS) ..."

I believe this setting has led to the hypothesis of a once dried out lake on Mars.

https://sciencesources.eurekalert.org/pub_releases/2018-04/gsoa-cam041918.php

https://www.jpl.nasa.gov/news/mars-rover-curiosity-examines-possible-mud-cracks