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From earlier 馬腦 (mǎnǎo, “horse's brain”), as a (probably mistranslated) calque of Sanskritअश्मगर्भ(aśmagarbha, “gemstone”, literally “stone + ”) from translated Buddhist texts. Could be a mistranslation, since “horse” in Sanskrit is अश्व(aśva).
Compare Tibetanརྟ་ཀླད(rta klad, “agate”, literally “horse + brain”), said to be a Chinesecalque, which is later semantically regularised into རྡོ་ཀླད(rdo klad, “agate”, literally “stone + brain”).