Wolframita

Características generales


Datos generales


Fórmula: (Fe2+)WO4
Sistema de cristalización: Monoclínico
Lustre: Submetálico
Color: Iron black or brownish black
Dureza: 5-5,5
Rareza: común
Características distintivas: Crystal habit, colour, density, luster and cleavage.

Clasificación

Estado IMA: Intermediate member of Solid solution Series

Nickel-Strunz : 04.DB.30
  • 4: Óxidos
  • 04.D: Metal:Oxígeno = 1:2 y similar
  • 04.DB: Con cationes tamaño medio- cadenas de octaedros borde compartido

Dana 8th ed. : 48.1.1.0

Etimología:

From the German, Wolfram, name for tungsten.



Formación y ambiente

Hydrothermal quartz vetas

Accessory, hydrothermal (high temp), post magmatic, sedimentary

Propiedades fisicas

Hábito: Striated, lamellar, granular or columnar

Lustre: Submetálico

Transparencia: Opaco

Color: Iron black or brownish black

Color en sección fina: Incolora

Raya: Pardo rojiza

Dureza (Mohs): 5-5,5

Tenacidad: Frágil

Exfoliación::
  • Primera exfoliación: Perfecta en [010]
  • Segunda exfoliación: Perfecta
  • Tercera exfoliación: Perfecta


Fractura: Desigual

Densidad: 7,1-7,5 g/cm3 (medida) | 7,35 g/cm3 (calculada)

Cristalografía

Sistema cristalino: Monoclínico

Clase (H-M): 1m () - Indefinida

Grupo espacial: P2/c

Parámetros de la celda: a=4,81Å b=5,73Å c=4,97Å

Estructura del cristal: β=90,82º

Volumen de unidad de celda: V 136,97Å

Z: 2

Propiedades ópticas

Tipo: Opaco

Valores RI: nα= 2,17 - 2,31; nβ= 2,22 - 2,31; nγ= 2,3 - 2,46

2V: medida: 73º - 79

Máxima birrefringencia: δ = 0,13

Dispersión: Ninguna

Anisotropismo: Perceptible en luz reflejada

Reflectancia:
Reflectancia
D(hkl)Intensidad
470.016
546.015,2
589.015,1
650.014,9


Propiedades químicas

Fórmula: (Fe2+)WO4

Elementos químicos: Fe, W, O

Composición química: O: 21,10%, W: 60,63%, Mn: 9,06%, Fe: 9,21%,

Tests químicos

Fusibilidad: 3; Mineral tipo: Almandino; Punto de fusión: 1050ºC; Funde con mechero solo trozos pequeños
Reacción a los ácidos: Decomposes in hot concentrated hydrochloric acid.
Otros: Fused with soda, and then dissolved in hydrochloric acid, gives on the addition of a small piece of zinc a blue solution when heated.



Relaciones con otros minerales

Minerales acompañantes:

Minerales acompañantes
NombreImagenClase mineralógica
CasiteritaCasiterita4. Óxidos
04.D: Metal:Oxígeno = 1:2 y similar

SnO2
FluoritaFluorita3. Haluros
03.A: Haluros simples, sin H2O

CaF2
Hagendorfita8. Fosfatos, arsenatos y vanadatos
08.A: Fosfatos, etc. sin aniones adicionales, sin H2O

NaCaMn2+Fe22+(PO4)3
HematitesHematites4. Óxidos
04.C: Metal:Oxígeno = 2:3, 3:5, y Similar

Fe2O3
MolibdenitaMolibdenita2. Sulfuros y sulfosales
02.E: Sulfuros con metal, M:S = 1:2

MoS2
PiritaPirita2. Sulfuros y sulfosales
02.E: Sulfuros con metal, M:S = 1:2

FeS2
CuarzoCuarzo4. Óxidos
04.D: Metal:Oxígeno = 1:2 y similar

SiO2
ScheelitaScheelita7. Sulfatos
07.G: Molibdatos, Wolframatos y Niobatos

Ca(WO4)
TopacioTopacio9. Silicatos
09.A: Nesosilicatos

Al2(SiO4)(F,OH)2




Yacimientos y localidades de interés

Localidades

  • Torrington, New South Wales, Australia
  • Proprietary mine, Broken Hill, New South Wales, Australia
  • Wolfram Camp, Queensland, Australia
  • Mt Cleveland Mine, Luina, Tasmania, Australia
  • Princess Mine, Moina, Tasmania, Australia
  • Deepwater, New South Wales, Australia
  • Torrington, New South Wales, Australia
  • Proprietary mine, Broken Hill, New South Wales, Australia
  • Wolfram Camp, Queensland, Australia
  • Mt Cleveland Mine, Luina, Tasmania, Australia
  • Princess Mine, Moina, Tasmania, Australia
  • Deepwater, New South Wales, Australia
  • Torrington, New South Wales, Australia
  • Deepwater, New South Wales, Australia
  • Princess Mine, Moina, Tasmania, Australia
  • Wolfram Camp, Queensland, Australia
  • Proprietary mine, Broken Hill, New South Wales, Australia
  • Torrington, New South Wales, Australia
  • Proprietary mine, Broken Hill, New South Wales, Australia
  • Wolfram Camp, Queensland, Australia
  • Mt Cleveland Mine, Luina, Tasmania, Australia
  • Princess Mine, Moina, Tasmania, Australia
  • Deepwater, New South Wales, Australia
  • Mt Cleveland Mine, Luina, Tasmania, Australia
  • Schellgaden, Salzburg, Austria
  • Schellgaden, Salzburg, Austria
  • Schellgaden, Salzburg, Austria
  • Schellgaden, Salzburg, Austria
  • Chicote Grande mine, Inquisivi, La Paz, Bolivia
  • Aceromarca mine, Mururata 2, Sud Yungas, La Paz, Bolivia
  • Cerro Rico Mt., Potosí, City, Potosí Dept, Bolivia
  • Amutari, Pando, Bolivia
  • Amutara Mt., Inquisivi, La Paz, Bolivia
  • Quime, Inquisivi, La Paz, Bolivia
  • Inio pegmatite, near Galileia, Minas Gerais, Brazil
  • Énio pegmatite, near Galiléia, Minas Gerais, Brazil
  • East Kemptville Tin Mine, East Kemptville, Yarmouth Co., Nova Scotia, Canada
  • Hengyang, Hunan province, China
  • Doluoshan Mine, Huaji Co., Guangdong Province, China
  • Chenzou mine, Hunan province, China
  • Krupka, Krusne Hory, Vychodocesky, Czech Republic
  • Horni Slavkov, Karlovy Vary, Czech Republic
  • Cinvald, Bohemia, Czech Republic
  • Gunnislake Clitters, Gunnislake, Cornwall, England
  • Gunheath pit, Bugle, Hensbarrow Moor, Cornwall, England
  • Gunheath China Clay Pit, Stenalees, St.Austell, Cornwall, England
  • East Pool mine, Illogan, Cornwall, England
  • Drakewalls mine, Calstock, Cornwall, England
  • Dolcoath mine, Camborne, Illogan, Cornwall, England
  • Croft Gothal mine, St. Hilary, Cornwall, England
  • Cooks Kitchen mine, Camborne, Illogan, Cornwall, England
  • Old Gunnislake mine, Calstock, Cornwall, England
  • Wheal Jane, Kea, Truro, Cornwall, England
  • Castle-an-Dinas mine, St. Columb Major, Cornwall, England
  • Cligga mine, Perranzabuloe, Cornwall, England
  • Carrock mine, Caldbeck Fells, Cumbria, England
  • Hemerdon Ball, Plymton, Devon, England
  • Hingston Down quarry, Calstock, Cornwall, England
  • Kitt Hill United Mine, Callington, Cornwall, England
  • Cligga Head, Perranzabuloe, Cornwall, England
  • Wheal Gorland, Gwennap, Cornwall, England
  • Wheal Fanny, Redruth, Illogan, Cornwall, England
  • Wet Swine Gill, Caldbeck Fells, Cumbria, England
  • Stennagwyn mine, St. Stephen-in-Brannel, Cornwall, England
  • Stenna Gwyn Mine, St. Austell, Cornwall, England
  • St. Michael's Mount, Marazion, Cornwall, England
  • South Crofty mine, Camborne, Illogan, Cornwall, England
  • Poldice mine, St. Day, Cornwall, England
  • Pedn-an-Drea mine, Redruth, Illogan, Cornwall, England
  • Wheal Kitty, St. Agnes, Cornwall, England
  • Mulberry Stockworks, Lanivet, Cornwall, England
  • Limoges, Haute-Vienne, France
  • Montebras, Soumans, Creuse, Limousin, France
  • Roßgrabeneck, Kinzigtal, Baden-Wuerttemberg, Germany
  • Daniel mine, Schneeberg, Sachsen, Germany
  • Ehrenfriedersdorf, Sachsen, Germany
  • Schneckenstein, Vogtland, Sachsen, Germany
  • Ivigtut, Arsuk Fjord, Greenland
  • Gold Mines river, Croghan Mountain, Co. Wicklow, Ireland
  • S'Ortu Beciu mine, Sardinia, Italy
  • Kara Oba, Karaganda Oblast, Kazakhstan
  • Kara-oba, Kazakhstan
  • Akschatau, Karaganda Oblast, Kazakhstan
  • Wolak mine, Chungcheongbukdo, Korea
  • Taewha mine, Chungcheongbukdo, Korea
  • Tong Wha, Korea
  • Taehwa mine, Neungam-ri, Angseong-myeon, Chungju, Chungcheongbukdo, South Korea
  • Panasqueira mine, Panasqueira, Beira-Beixa, Portugal
  • Lovozero massif, Mt Alluaiv, Kola Peninsula, Russia
  • Aldan Shield, Yakutiya, Siberia, Russia
  • Morey, Nye Co., Nevada, USA
  • Monroe, Fairfield Co., Connecticut, USA
  • Mammoth-St. Anthony mine, Tiger, Pinal Co., Arizona, USA
  • Eastman Hill Tin prospects, Jackson, Carroll Co., New Hampshire, USA
  • Butte General Area, Montana, USA
  • Berry Ledge locality, Cornish, York Co., Maine, USA
  • Nederland, Boulder Co., Colorado, USA
  • Tungsten Mine, Trumbull, Fairfield Co., Connecticut, USA
  • Sunlight copper district, Park Co., Wyoming, USA
  • Hamme Tungsten Mine, Vance Co., North Carolina, USA


Bibliografía y más información

American Mineralogist, vol. 34, p.692-698, (1949)

Comparte en:


Síguenos en nuestro canal de YouTube