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The rare chloromelanite , generally called black jade, though slivers of it have a green tinge, often is classed as a third type of jade.
And it may in fact be any one of three very hard minerals: nephrite, jadeite and chloromelanite .
He called it chloromelanite , a green - to black-flecked variety of jadeite.
Omphacite and chloromelanite are locally quite abundant in these rarer rocks.
Deep green to greenish-black varieties are called chloromelanite and are colored by iron.
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