Cryptomelane

Características generales


Datos generales


Fórmula: K(Mn74+Mn3+)O16
Sistema de cristalización: Monoclínico
Lustre: Submetálico
Color: Grey, blue grey or black
Dureza: 6-6,5
Rareza: muy raro

Clasificación

Estado IMA: Approved 1982

Nickel-Strunz : 04.DK.10
  • 4: Óxidos
  • 04.D: Metal:Oxígeno = 1:2 y similar
  • 04.DK: Con cationes grandes a medianos- estructuras tunel

Dana 8th ed. : 7.9.1.2

Etimología:

From the Greek for hidden and black, as the identity of this common, black mineral is lost in the group of other black Mn-bearing oxides.



Formación y ambiente

Commonest of the hard, black, fine-grained manganese oxides formerly called psilomelane.

Accessory, sedimentary

Propiedades fisicas

Hábito: Massive, cryptocrystalline or botryoidal

Lustre: Submetálico

Transparencia: Opaco

Color: Grey, blue grey or black

Raya: Negra pardusca

Dureza (Mohs): 6-6,5

Fractura: Concoidal

Densidad: 4,4 g/cm3 (medida) | 4,35 g/cm3 (calculada)

Cristalografía

Sistema cristalino: Monoclínico

Clase (H-M): -1m (2/m) - Prismática

Grupo espacial: I2/m

Parámetros de la celda: a=9,79Å b=2,88Å c=9,94Å

Estructura del cristal: β=90,62º

Volumen de unidad de celda: V 280,24Å

Z: 1

Difracción de Rayos X:
Difracción de Rayos X
D(hkl)Intensidad
2,399100
1,65480
3,1180

Propiedades ópticas

Tipo: Opaco

Propiedades químicas

Fórmula: K(Mn74+Mn3+)O16

Elementos químicos: K, Mn, O

Composición química: O: 34,85%, K: 5,32%, Mn: 59,83%,



Yacimientos y localidades de interés

Localidades

  • Chhindwara, Madhya Pradesh, India - Localidad tipo.
  • Tombstone, Cochise Co., Arizona, USA - Localidad tipo.
  • Burra Burra mine, Burra, South Australia, Australia
  • Reaphook Hill, Flinders Range, South Australia, Australia
  • Proprietary mine, Broken Hill, New South Wales, Australia
  • Claim 84, Anticline prospect, Ashburton Downs, Western Australia, Australia
  • Burra Burra mine, Burra, South Australia, Australia
  • Reaphook Hill, Flinders Range, South Australia, Australia
  • Proprietary mine, Broken Hill, New South Wales, Australia
  • Claim 84, Anticline prospect, Ashburton Downs, Western Australia, Australia
  • Burra Burra mine, Burra, South Australia, Australia
  • Reaphook Hill, Flinders Range, South Australia, Australia
  • Proprietary mine, Broken Hill, New South Wales, Australia
  • Claim 84, Anticline prospect, Ashburton Downs, Western Australia, Australia
  • Burra Burra mine, Burra, South Australia, Australia
  • Reaphook Hill, Flinders Range, South Australia, Australia
  • Claim 84, Anticline prospect, Ashburton Downs, Western Australia, Australia
  • Proprietary mine, Broken Hill, New South Wales, Australia
  • Sapucaia pegmatite mine, near Galileia, Minas Gerais, Brazil
  • Glücksrad mine, Clausthal-Zellerfeld, Harz Mts, Sachsen, Germany
  • Atterode mine, Bad Salzungen, Thüringen, Germany
  • Christophstal, Freudenstadt, Baden-Wuerttemberg, Germany
  • Daniel mine, Schneeberg, Sachsen, Germany
  • Gottlob mine, Friedrichroda, Bad Salzungen, Thüringen, Germany
  • Stahlberg mine, Kohlberg, Trusetal, Bad Salzungen, Thüringen, Germany
  • Clara mine, Oberwolfach, Baden-Wuerttemberg, Germany
  • Silberbrünnle mine, Kinzigtal, Baden-Wuerttemberg, Germany
  • Mommel mine, Kohlberg, Trusetal, Bad Salzungen, Thüringen, Germany
  • Kochenfeld mine, Trusetal, Bad Salzungen, Thüringen, Germany
  • Hilarion adit, Agios Konstandinos, Laurion, Attica, Greece
  • Laurion-Kamaréza road, Laurion, Attica, Greece
  • Kamaréza Central mine, Laurion, Attica, Greece
  • Ligurian Briançonnais Domain, Maritime Alps, Italy
  • Boleo, Santa Rosalia, Baja California, Mexico
  • Mina Ojuela, Mapimi, Durango, Mexico
  • Mt Aikuaiventchorr, Khibiny, Kola Peninsula, Russia
  • Polar Urals, Tyumen Oblast, Russia
  • Bisbee, Cochise Co., Arizona, USA
  • Butte General Area, Montana, USA
  • Lord Hill mine, Stoneham, Oxford Co., Maine, USA
  • Conklin quarry, Lincoln, Providence Co., Rhode Island, USA
  • Everett, Bedford Co., Pennsylvania, USA
  • Foote Spodumene Mine, Kings Mountain, Cleveland Co., North Carolina, USA
  • Betts Manganese Mine, Plainfield, Hampshire Co., Massachusetts, USA
  • Berry-Havey mines, Poland, Androscoggin Co., Maine, USA
  • Bachman Iron Mine, Hellerton, Northampton Co., Pennsylvania, USA
  • Perry Petalite prospect, Peru, Oxford Co., Maine, USA
  • Moores Hill, Cumberland Co., Pennsylvania, USA
  • Marion, Smyth Co., Virginia, USA
  • Malpais Hill, Pinal Co., Arizona, USA
  • Staples Road Manganese bed, Cumberland, Providence Co., Rhode Island, USA
  • General Area, Franklin, Sussex Co., New Jersey, USA


Bibliografía y más información

American Mineralogist, vol. 27, p.607-613, (1942)
Acta Crystallographica, vol. B42, p.162, (1986)

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