Chinese Scientists Discover Two New Lunar Minerals from Chang'e-5 Samples
"These discoveries provide new mineralogical samples for studying lunar formation, magmatic activity, and chemical differentiation."
On April 22, 2025, at the opening ceremony of the 11th China Space Day, Chinese scientists announced the identification of two previously unknown lunar minerals from samples collected by the Chang'e-5 mission. Officially recognized by the International Mineralogical Association, both minerals belong to the rare-earth phosphate category and are part of the merrillite group, with no exact structural counterparts found on Earth.
Discovery and Naming
The minerals are named magnesiochangesite-(Y) and changesite-(Ce). They represent the second and third lunar minerals discovered by Chinese researchers, and globally the seventh and eighth identified in returned lunar samples.
Magnesiochangesite-(Y)
Discovered by a team led by Li Ziying from the Beijing Research Institute of Uranium Geology, this mineral appears as short columnar crystals ranging from 2 to 30 micrometers in size, found within basalt fragments. Magnesium dominates the M site in its crystal lattice.
Identification required analysis of tens of thousands of particles. Only one ideal crystal, 20 micrometers wide, was suitable for testing. Extraction was performed using a focused ion beam scanning electron microscope.
Changesite-(Ce)
Discovered by a team led by Hou Zengqian from the Chinese Academy of Geological Sciences, this is a phosphate mineral rich in the rare-earth element cerium. The mineral was identified both in Chang'e-5 lunar soil and in a 44-gram lunar meteorite discovered in China (Pakepake 005) in 2024.
Changesite-(Ce) shares the same structural model as changesite-(Y) but is dominated by cerium rather than yttrium. A related mineral, 'cerium-magnesium-chanthesite,' was reported in studies of the same meteorite. It is colorless, transparent, structurally fragile, and exhibits fluorescence, with a particle size of 3 to 25 micrometers.
Research Methods
Scientists employed advanced in-situ analytical techniques, including:
- Nanoindentation
- Cathodoluminescence
- Scanning electron microscopy
- Electron probe analysis
- Raman spectroscopy
- Single-crystal X-ray diffraction
- Three-dimensional electron diffraction
These methods were used to determine physical properties, chemical composition, and crystal structures.
Scientific Significance
According to researchers, the composition of these minerals differs significantly from those found in Apollo program samples, which are enriched in heavy rare-earth elements. Chang'e-5 samples are enriched in light rare-earth elements such as cerium, suggesting differentiation during lunar magmatic evolution.
"The discoveries offer fundamental data for assessing the Moon's rare-earth resource potential."
The findings provide new mineralogical samples for studying:
- Lunar formation
- Magmatic activity
- Chemical differentiation
Potential Applications
Researchers have noted that the minerals exhibit luminescent characteristics. Changesite-(Ce) reportedly shows a pronounced luminescent effect, with potential for development of white light-emitting diode phosphor materials. The fluorescent properties of the cerium-rich mineral have also been cited as possible candidates for more efficient LED research.
No plans for lunar mining currently exist, though scientists aim to reproduce the minerals under laboratory conditions.