Antarctic carbonaceous chondrite (CC) meteorite chip samples in the Japanese and US collections have been studied by an ultraviolet (UV), visible (Vis), and near-infrared (NIR) (UVVNIR) spectrometer and a Fourier-transform infrared (FTIR) spectrometer, targeting small areas of about 2–6 mm in diameter. UVVNIR and FTIR reflectance spectra of 169 spots on 148 CC chips were measured on their naturally broken surfaces with no sample preparation. Among them, 83 spectra were accepted as reasonably free of terrestrial weathering or surface texture effects. X-ray diffraction (XRD) and FTIR measurements of a weathered sample revealed that gypsum likely formed on its surface after recovery from Antarctica. Principal component analysis (PCA) of the UVVNIR-FTIR combined spectra allowed distinguishing powder and chip or surface texture and identifying their class and thermal metamorphism. Gaussian fitting of the 3 μm absorption band of hydrous CC samples allowed for removal of the spectral effects of adsorbed H₂O and for the extraction of structural absorption bands which are characteristic of CC classes and degree of aqueous alteration. These results suggest that CC-like rocks on small asteroids without fine regolith can be identified through spectral reflectance measurements by spacecraft, landers, or rovers.

日本和美国收藏的南极碳质球粒陨石 (CC) 陨石碎片样本已通过紫外 (UV)、可见光 (Vis) 和近红外 (NIR) (UVVNIR) 光谱仪以及傅里叶变换红外 (FTIR) 光谱仪进行了研究光谱仪，针对直径约 2-6 毫米的小区域。在 148 个 CC 芯片上的 169 个点的 UVVNIR 和 FTIR 反射光谱是在它们自然破碎的表面上测量的，无需样品制备。其中，83 个光谱被认为没有地球风化或表面纹理影响。风化样品的 X 射线衍射 (XRD) 和 FTIR 测量表明，从南极洲回收后，石膏可能在其表面形成。UVVNIR-FTIR 组合光谱的主成分分析 (PCA) 可以区分粉末和碎片或表面纹理，并确定它们的类别和热变质。含水 CC 样品的 3 μm 吸收带的高斯拟合允许去除吸附的 H 的光谱效应₂ O 和用于提取具有 CC 类别和水性改变程度特征的结构吸收带。这些结果表明，可以通过航天器、着陆器或漫游车的光谱反射测量来识别没有精细风化层的小行星上的类 CC 岩石。