Sample
Name
Water ice particles 67±31μm containing 1wt% mineral mixture of Magnetite 63wt%, Antigorite 9wt%, Dolomite 6wt%, 0-36µm grains in inter-mixture and NH4-nontronite 22wt% in intra-mixture at 173 K
Date
2019-04-23
Thickness
20.0 $\pm$ 1.0 $mm$
Diameter
48.0 $mm$
Surface roughness
smooth
Substrate material
black aluminum tape
Substrate comments
Cylindrical container of 4.8 cm diameter and 2.0 cm depth, which had been coated with black matte aluminum tape on the inside.
Comments
Fresh sample prepared just before the measurement.
Temperature
173.0 $K$
Temperature max
173.0 $K$
Type
vacuum
Fluid pressure
1.5e-06 $mbar$
Comments
The sample was kept under high vacuum
Number
1
Layers
Title
Prepation of the sample: 1) Preparation of ice-nontronite particles 2) Mixing of these particles with the other mineral powders

Precursors

Matters

Produced sample

Sample
Water ice particles 67±31μm containing 1wt% mineral mixture of Magnetite 63wt%, Antigorite 9wt%, Dolomite 6wt%, 0-36µm grains in inter-mixture and NH4-nontronite 22wt% in intra-mixture at 173 K (this sample)
Processing steps
Step Chronology Date Type Process Changes
#1 before layer formation 2019-04-23 mixing We first prepared water ice particles containing 0.22wt% of NH4-nontronite.
#2 before layer formation 2019-04-23 mixing We mixed the mineral powders with the ice particles containing 0.22wt% of NH4-nontronite in an aluminium bottle, pre-cooled with liquid nitrogen, using a vortex shaker. 0.178 g of mineral powder (81wt% magnetite (0.144g), 11wt% antigonite (0.020g) and 8wt% dolomite (0.014g)) was combined with 22.31 g of ice particles containing 0.22wt% of NH4-nontronite to obtain a 1wt% solid-to-ice mixture by weight.
#3 before layer formation 2019-04-23 layer formation Inside the freezer, we sieved the ice-dust mixture (mesh size 400 µm) to fill the 2 cm-deep sample holder to the rim, smoothing the surface with a spatula. The holder and spatula had been pre-cooled with liquid nitrogen.
Comments
It was first intended to produce water ice particles containing all the minerals (NH4-nontronite, magnetite, antigorite, dolomite) in an intra-mixture, but we failed at including the magnetite, antigorite and dolomite in the water suspension due to technical issues. Based on mass measurements, densities and physical properties, we hypothesized that the ice particles only contain NH4-nontronite. We then mixed these ice particles with the rest of the mineral powder, made of the remaining magnetite, antigorite and dolomite.