Planetary Simulant Database: Kohyama Simulant

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Component Abundance (%)
Gabbro 100

Bulk Chemistry

Element Wt.%
Si 44.39
Ti 0.70
Al 18.05
Fe2+ 3.52
Fe3+ 9.04
Mg 2.97
Ca 15.25
Na 4.13
K 1.52
Mn 0.24
P 0.13
S 0.01
Total 100.00

Physical Properties

Property Value
Mean grain size 85 μm
Simulant Name: Kohyama Simulant
Current Status: Unknown
Developed By: Shimizu Corporation
Available From: N/A
Publications: Sueyoshi, K. et al. (2008), Reaction Mechanism of Various Types of Lunar Soil Simulants by Hydrogen Reduction. 11th Biennial ASCE Aerospace Division International Conference on Engineering, Science, Construction, and Operations in Challenging Environments.

Similar to the Oshima Simulant, Kohyama is also referred to as “Kohyama Base Simulant”, but this likely refers to the fact that it is “based” on the Kohyama gabbro. The simulant was developed by the Shimizu Corporation, along with Oshima and the FJS- series. Kohyama appears to be made entirely of gabbro, and is intermediate between highlands and mare in composition.

If the production methods for Kohyama were the same as the FJS- series, then the raw materials were progressively crushed finer until the desired particle size distribution was obtained. The amount of Kohyama produced, and its fate, are unclear.