Vapor-Grown Crystals in the Yanzhuang Meteorite



Vapor-grown crystals intimately related to shock metamorphism of meteorites were found in the Yanzhuang chondrite which had been heavily impacted in the space. These crystals include: (i) subhedral low-Ca pyroxene occurring on the wall of the pores within a silicate melt pocket that experienced a shock temperature higher than 1500 °C, (ii) FeNi needle-whiskers (taenite) occurring in the cracks in the partially melted chondritic facies that experienced a shock temperature of 850–1300 °C, and (iii) euhedral troilite crystals with abundant microholes occurring in the cracks in the brecciated facies and the lightly deformed chondritic facies that experienced a shock temperature lower than 850 °C. The occurrence and mineralogical features of vapor-grown crystals show that vaporization of minerals could be produced in heavily impacted meteorites and that a small amount of crystals could be deposited in situ from vapor phases.


Vapor-grown crystals Low-Ca pyroxene FeNi needle-whiskers Euhedral troilite crystals 


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© Guangdong Science & Technology Press Co., Ltd and Springer Nature Singapore Pte Ltd. 2020

Authors and Affiliations

  1. 1.Guangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhouChina

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