🌕 Chinese Scientists Discover Two New Lunar Minerals
A major breakthrough in lunar science: Two new minerals, both part of the rare-earth phosphate family, have been identified from samples returned by China's Chang'e-5 mission.
Discovery Announcement
The findings were announced on April 22, 2025, at the opening ceremony of the 11th China Space Day. The minerals—named magnesiochangesite-(Y) and changesite-(Ce) —have been officially approved by the International Mineralogical Association.
These represent the second and third lunar minerals discovered by Chinese scientists, and globally, the seventh and eighth identified in returned lunar samples.
Mineral Properties
Both minerals belong to the rare-earth phosphate category and are part of the merrillite group. Their crystal structures are unique, with no exact counterparts on Earth.
🔬 Magnesiochangesite-(Y)
- Discovered by: A team led by Li Ziying from the Beijing Research Institute of Uranium Geology
- Appearance: Short columnar crystals, 2 to 30 micrometers in size, found within basalt fragments
- Key characteristic: Magnesium dominates the M site in its crystal lattice
- Extraction process: Described as "microsurgery"—requiring analysis of tens of thousands of particles. Only one ideal crystal, measuring 20 micrometers wide, was suitable for testing. Extraction used a focused ion beam scanning electron microscope.
🔬 Changesite-(Ce)
- Discovered by: A team led by Hou Zengqian from the Chinese Academy of Geological Sciences
- Composition: A phosphate mineral rich in the rare-earth element cerium
- Dual source: Identified both in Chang'e-5 lunar soil and in a lunar meteorite (Pakepake 005) found in China's Taklimakan Desert in 2024
- Structural relationship: Shares the same model as changesite-(Y) but is dominated by cerium instead of yttrium
- Scientific insight: According to Hou, Apollo samples are enriched in heavy rare-earth elements, while Chang'e-5 samples are enriched in light rare-earth elements, suggesting differentiation during lunar magmatic evolution
Research Methods
The research team employed a suite of advanced in-situ analytical techniques:
Nanoindentation, cathodoluminescence, scanning electron microscopy, electron probe analysis, Raman spectroscopy, single-crystal X-ray diffraction, and three-dimensional electron diffraction
These methods were used to determine physical properties, chemical composition, and crystal structure.
Significance
According to researchers, these discoveries:
- Provide new mineralogical samples for studying lunar formation, magmatic activity, and chemical differentiation
- Offer fundamental data for assessing the Moon's rare-earth resource potential
- Show practical application potential—Qu Kai noted that changesite-(Ce) exhibits a pronounced luminescent effect, showing promise for use in white light-emitting diode phosphor materials