apjohniten.
/ˈapdʒɒnʌɪt/ Mineralogy.
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Manganese alum; a double sulphate of potash and manganese, occurring as a mineral in fibrous or asbestiform masses, white, and with a silky lustre.
This entry has not yet been fully updated (first published 1885; most recently modified version published online June 2018).
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