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Black onyx, like all stones of this color, protects against negative influences by acting as a filter. It is a stone that allows us to focus our attention on the really useful things, to discern between constructive judgments and deceptive ones, which are given to bring us down. It acts on the first chakra, related to our survival instinct, the need to put down roots.
1st Chakra - Muladhara - Root | Color: Red | Gland: Adrenals