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このほど、唯一残されていた、八王子隕石のかけらではないかとされる石について、本物かどうか、最新の科学技術で分析が試みられました。(source)
My attempt at translation:
Lately, Concerning a stone treated as whether it is the only remaining fragment of hachioji meteorite, an analysis with latest technology was attempted.
I'm especially skeptical whether I parsed the attributes correctly or not, although the translation seems correct at least.
このほど、
Recently,〈唯一残されていた、｛（八王子隕石のかけらではないか）とされる石｝〉について、
(concerning/on) an only remaining stone which is considered (by some) as a candidate of a fragment of Hachioji meteorite,本物かどうか、（最新の科学技術で）分析が試みられました。
an analysis was carried out using the latest technology to determine whether or not it's a genuine one.
The analysis was to determine 本物かどうか (whether it's a genuine meteorite fragment), not 唯一残されていたかどうか (whether it's the last one). 唯一残されていた simply modifies the following 石.
