JEZ-1 Jezero Delta Simulant

Exolith Simulant: JEZ-1 Jezero Delta Simulant


Mineral Wt.%
Olivine 32.0
Plagioclase 16.0
Glass-rich basalt 13.5
Pyroxene 12.0
Mg-carbonate 11.0
Smectite 6.0
Mg-sulfate 2.4
Ferrihydrite 2.1
Hydrated silica 1.8
Magnetite 1.1
Anhydrite 1.0
Fe-carbonate 0.8
Hematite 0.3

Bulk Chemistry

Because JEZ-1 is a mineralogical standard, the bulk chemistry of simulants created from the standard will differ depending on the crystal chemistry of the source minerals used. Below, we report the latest analysis for the production version of JEZ-1.

Oxide Wt.%
SiO2 44.2
TiO2 0.2
Al2O3 11.3
Cr2O3 0.3
FeOT 9.5
MnO 0.1
MgO 25.9
CaO 3.5
Na2O 1.9
K2O 0.3
P2O5 0.6
SO3 2.1
Total 100.0

Physical Properties

Particle size range: 0-1 mm
Mean particle size (by volume): 38 μm
Bulk density*: 1.54 g/cm3
*Note that bulk density is not an inherent property and depends on the level of compaction


The Jezero Delta Simulant (JEZ-1) was made to simulate anticipated materials in the Jezero Crater deltas that will be investigated by the NASA Mars 2020 rover. The simulant is a mixture of MGS-1 mineralogy with smectite clay, Mg-carbonate, and additional olivine that have all been detected from orbital remote sensing in the Jezero delta deposits.

The state of lithificaiton, mineralogy, and grain size distribution are likely variable throughout the Jezero deltas; JEZ-1 represents unconsolidated material, but can be compacted under various pressures to form a more cohesive solid.


Photograph of JEZ-1: