ludwigite


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ludwigite

[′ləd‚wi‚gīt]
(mineralogy)
(Mg,Fe)2FeBO5 A blackish-green mineral that crystallizes in the monoclinic system and occurs in fibrous masses; isomorphous with ronsenite.
References in periodicals archive ?
Ludwigite is a boron mineral found as microscopic inclusions in native arsenic from the Bor pit.
In different limestone-dolomite associations the boron-rich minerals harkerite, ludwigite and fluoborite have been identified, though not together.
The name is still used by local collectors, as "breislakite" is now known to be either ludwigite or vonsenite, the two occurring together and even as mixed crystals at this locality, and being indistinguishable without chemical analysis.
It has also been found in drill cores as a mantle about ludwigite grains from the Aldan Shield in eastern Siberia (Grew et al.