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Hidrotermalitos ricos em clorita, sericita, actinolita, carbonato e quartzo indicam uma idade de 2148 ± 57 Ma (1s) com Epsilon Nd (T) of +1.1. O Epsilon Nd (T) positivo sugere pouca ou nenhuma ...
Palavras-chave: Muiraquitã, jade, jadeíta, Amazônia, tremolita, actinolita. 1. Introduction The muiraquitãs are lithic artifacts normally sculpted from different kinds of green stones used as amulets ...
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