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HOLLANDITE [2 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2011-07-29

English

Subject field(s)
  • Mineralogy
Universal entry(ies)
Ba(Mn4+,Mn2+,Fe3+)8O16
formula, see observation
DEF

A silvery-gray to black monoclinic mineral which consists of a manganate of manganese and barium occurring in massive or fibrous structures.

OBS

Named after T.H. Holland, Director of the Geological Survey of India.

OBS

Chemical formula: Ba(Mn4+,Mn2+,Fe3+)8O]16

French

Domaine(s)
  • Minéralogie
Entrée(s) universelle(s)
Ba(Mn4+,Mn2+,Fe3+)8O16
formula, see observation
DEF

Minéral opaque du système monoclinique, de couleur noire, noir grisâtre et gris d'argent, se présentant sous forme massive ou fibreuse.

CONT

Les psilomélanes sont formés de bioxyde de manganèse, impur et hydraté, associé en proportion diverse à des oxydes [...]. Ils comprennent certains minéraux, assez bien définis, comme la hollandite (barytique et ferreuse), la romanéchite (barytique), la coronadite (barytique et plombeuse).

OBS

Étymologie : en l'honneur de T. H. Holland, directeur du Service géologique de l'Inde.

OBS

Formule chimique : Ba(Mn4+,Mn2+,Fe3+)8O16

Spanish

Campo(s) temático(s)
  • Mineralogía
Entrada(s) universal(es)
Ba(Mn4+,Mn2+,Fe3+)8O16
formula, see observation
DEF

Variedad de manganomelana que contiene bario.

OBS

Fórmula química: Ba(Mn4+,Mn2+,Fe3+)8O16

Save record 1

Record 2 1977-11-28

English

Subject field(s)
  • Economic Geology
  • Mineralogy
OBS

A black manganate of lead and manganese,(...) massive; fibrous. Probably a mixture of hollandite and an unknown lead mineral.(...) Resembles psilomelane in general aspect.

French

Domaine(s)
  • Géologie économique
  • Minéralogie
OBS

Les deux couches de minerai pulvérulent sont constituées principalement de "pyrolusite" (...) et de minéraux crypto-cristallins du groupe "hollandite-ébelménite" (...) - "coronadite" (...)

Spanish

Save record 2

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