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Related Experiment Video

Updated: Jul 11, 2026

Metal-silicate Partitioning at High Pressure and Temperature: Experimental Methods and a Protocol to Suppress Highly Siderophile Element Inclusions

Metal-silicate Partitioning at High Pressure and Temperature: Experimental Methods and a Protocol to Suppress Highly Siderophile Element Inclusions

Published on: June 13, 2015

Garnet: first occurrence in the lunar rocks.

R J Traill, A G Plant, J A Douglas

Science (New York, N.Y.)

|September 4, 1970

Summary

Three almandine-rich garnets from lunar sample 12021 reveal specific compositions and physical properties. These lunar garnets likely formed late in the crystallization sequence of the sample.

Area of Science:

Mineralogy
Lunar Geology
Geochemistry

Background:

Garnets are important indicator minerals in geological samples.
Lunar samples provide unique insights into extraterrestrial geological processes.

Purpose of the Study:

To characterize the composition and physical properties of garnets from lunar sample 12021.
To determine the formation sequence of these lunar garnets.

Main Methods:

Mineralogical analysis of garnet grains.
Compositional analysis using electron microprobe or similar techniques.
Measurement of physical properties such as cell edge and refractive index.

Main Results:

Three almandine-rich garnet grains were analyzed.

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The garnets exhibit a specific composition: Alm(70.7)Gro(25.0)Sp(2.7)Pyr(1.6).

Measured cell edge is 11.624 angstroms and refractive index is 1.81.

Conclusions:

The analyzed garnets are almandine-rich, indicating specific formation conditions.
The physical properties align with known garnet characteristics.
The garnets likely formed late in the crystallization sequence of lunar sample 12021.