Black Sardonyx Hearts
Black Sardonyx is a variety of onyx, which is a type of chalcedony quartz that comes in various colours. Sardonyx itself is characterised by alternating bands of sard (a brownish to reddish-brown variety of chalcedony) and onyx (black chalcedony). Black Sardonyx, as the name suggests, primarily consists of black and white or black and clear bands.
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