  FTIR measurement on MK immediately after its fall, shows a unique doublet
around 10 micrometer, significantly different from many ordinary CM2
chondrites, where only a singlet around 10 micrometer is observed. Also, a very
faint 11.2 micrometer feature in MK indicates the absence of anhydrous
silicates, olivine and thus complete serpentinization of anhydrous silicates
due to severe aqueous alteration on parent body. Raman studies show a low peak
metamorphic temperature around 0 {\deg}C and consistent with the absence of
peak corresponding to tochilinite in FTIR spectrum, which forms at higher
temperature. The first thermogravimetric measurement was carried out within 24
hrs. of MK fall, showing 10% weight loss in 400-770 {\deg}C range and is
consistent with TGA on another MK fragment of same batch after 30 months,
confirming no environmental impact on the water bound to hydrated clay. This
large weight loss also rules out any post aqueous alteration thermal event
suffered by MK and signify the presence of hydrated clay. The measured ratio of
MgO/FeO is about 0.56, and sulfur weight is 3.4 %. Recently, based on only
aqueous alteration Potin et al. (Potin et al. 2020), classified MK as CM1,
implying MK should be utmost altered CM, whereas Ray et al. (Ray et al 2018),
as equivalent to Paris like (CM2.7), least aqueous altered. However, if we
combine the observed aqueous alteration, MgO/FeO weight ratio, and sulfur
weight % together will provide a more comprehensive understanding for MK, and
thus, we classify it as CM2.3.insted CM1 or CM(2.7-2.9).
