Eritrina

Características generales

Fórmula: Co₃(AsO₄)₂·8H₂O
Sistema de cristalización: Monoclínico
Lustre: Perlado
Color: Violet red, purple red, light pink or colourless
Dureza: 1,5-2,5
Rareza: muy raro
Características distintivas: Colour, associations and flexible crystals.
Grupo de minerales: Grupo de la Vivianita
Serie: Serie de la Annabergita - Eritrina

Formación y ambiente

Oxidation zone

Secundario

Propiedades fisicas

Hábito: Striated, stellate, reniform, prismatic, globular, divergent or columnar

Lustre: Perlado

Transparencia: Transparente, Subtranslúcido

Color: Violet red, purple red, light pink or colourless

Color en sección fina: Incolora

Dureza (Mohs): 1,5-2,5

Tenacidad: Séctil

Exfoliación::

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

Fractura: Séctil

Densidad: 3,1-3,2 g/cm³ (medida) | 3,18 g/cm³ (calculada)

Cristalografía

Sistema cristalino:

Monoclínico

Clase (H-M): 1m (2/m) - Prismática

Grupo espacial: I2/m

Parámetros de la celda: a=10,2Å b=13,37Å c=4,74Å

Estructura del cristal: β=105,02º

Volumen de unidad de celda: V 624,34Å

Z: 2

Difracción de Rayos X:

Difracción de Rayos X
D(hkl)	Intensidad
6,72	100
3,003	47
3,227	42

Propiedades ópticas

Tipo: Biaxial (+)

Valores RI: n_α= 1,626 - 1,629; n_β= 1,662 - 1,663; n_γ= 1,699 - 1,701

2V: medida: 85º - 90

Máxima birrefringencia: δ = 0,073

Dispersión: r>v

Pleocroismo: Pleiocroico
X: Pale pink
Y: Pale violet
Z: Red

Propiedades químicas

Fórmula: Co₃(AsO₄)₂·8H₂O

Elementos químicos: Co, As, O, H

Composición química: H: 2,69%, H2O: 24,04%, As: 25,03%, Co: 29,53%, O: 42,75%,

Tests químicos

Fusibilidad: 2; Mineral tipo: Natrolita; Punto de fusión: 800ºC; Funde con mechero de gas
Reacción a los ácidos: Se disuelve en ácido clorhídrico.
Color de la llama: Blue
Ensayos en tubo cerrado: Gives off water and coats tube with black sublimate.
Formación de sublimados: Gives off arsenical fumes.

Otras propiedades

Luminiscente: Orange
Magnetismo: No magnético

Relaciones con otros minerales

Miembro del grupo de minerales: Grupo de la Vivianita

minerales

Annabergita

Fórmula: Ni₃(AsO₄)₂·8H₂O
Sistema de cristalización: Monoclínico
Dureza: 1-3
Color: Verde brillante a verde-manzana, blanco, rosado cuando tiene cobalto
Raya: Verde clara
Brillo: Perlado

minerales

Bobierrita

Fórmula: Mg₃(PO₄)₂·8H₂O
Sistema de cristalización: Monoclínico
Dureza: 2-2,5
Color: Blanco, gris o incoloro
Raya: Blanco
Brillo: Vítreo

minerales

Eritrina

Fórmula: Co₃(AsO₄)₂·8H₂O
Sistema de cristalización: Monoclínico
Dureza: 1,5-2,5
Brillo: Perlado

minerales

Vivianita

Fórmula: Fe₃²⁺(PO₄)₂·8H₂O
Sistema de cristalización: Monoclínico
Dureza: 1,5-2
Raya: Blanco azulada
Brillo: Vítreo - perlado

Minerales acompañantes:

minerales

Yacimientos y localidades de interés

Localidades

Allemont, Isère, France - Localidad tipo.
Colebrook Hill, Rosebery, Tasmania, Australia
Mt Cobalt, Queensland, Australia
Proprietary mine, Broken Hill, New South Wales, Australia
Schwaz-Brixlegg, Tyrol, Austria
Zinkwand, Schladming, Steiermark, Austria
Marcamarcani (San Baldomero) mine, Sorata, Larecaja, La Paz, Bolivia
Cadesky Vein, Hi-Ho mine, Cobalt, Timiskaming district, Ontario, Canada
Highland Bell mine, Beaverdell, British Columbia, Canada
Mt St.-Hilaire, Rouville Co., Québec, Canada
Nanisivik Mine, Baffin Island, Nunavut, Northwest Territories, Canada
Port Radium, Northwest Territories, Canada
Poudrette quarry, Mt St.-Hilaire, Rouville Co., Québec, Canada
Silvana mine, Sandon, British Columbia, Canada
Silver Islet mine, Lake Superior, Ontario, Canada
Alexander Gallery, Vrancice, Príbram, Stredocesky, Czech Republic
Horni Hostice, Maehren, Czech Republic
Jáchymov, Bohemia, Czech Republic
Krupka, Krusne Hory, Vychodocesky, Czech Republic
Medenec (Kupferberg), Chomutov, Krusne Hory, Vychodocesky, Czech Republic
Trebsko Deposit, Príbram, Stredocesky, Czech Republic
Barden Hill Quarry, Coalville, Leicestershire, England
Botallack mine, Botallack, St. Just, Cornwall, England
Brownley Hill Pb-Zn mine, Nenthead, Cumbria, England
Cligga Head, Perranzabuloe, Cornwall, England
Cligga mine, Perranzabuloe, Cornwall, England
Cobalt Mine, Scar Crag, Causey Pike, Cumbria, England
Coniston Copper Mines, Coniston, Cumbria, England
Dolcoath mine, Camborne, Illogan, Cornwall, England
East Pool mine, Illogan, Cornwall, England
Engine Vein, Alderley Edge, Shropshire, England
Ennys Wheal Virgin, St. Hilary, Cornwall, England
Force Crag Mine, Keswick, Cumbria, England
Gipsy Lane Brickpit, Leicestershire, England
Greenburn Beck Level, Little Langdale, Cumbria, England
Hesk Fell Mine, Ulpha, Cumbria, England
Holehouse Gill Mine, Ulpha, Cumbria, England
Ingray Gill, Caldbeck Fells, Cumbria, England
Kingswood mine, Buckfastleigh, Devon, England
Littleham Bay, Devon, England
Old Gunnislake mine, Calstock, Cornwall, England
Paddy End Mine, Coniston, Cumbria, England
Pedn-an-Drea mine, Redruth, Illogan, Cornwall, England
Penberthy Croft mine, St. Hilary, Cornwall, England
Pentire Glaze mine, St. Minver, Cornwall, England
Polgooth mine, St. Austell, Cornwall, England
Rosecommon Cliffs, Botallack, St. Just, Cornwall, England
Roughton Gill Mine, Caldbeck Fells, Cumbria, England
Sandbeds mine, Caldbeck Fells, Cumbria, England
Shap Blue Quarry, Shap, Cumbria, England
Snailbeach mine, Snailbeach, Shropshire, England
South Terras mine, St. Stephen-in-Brannel, Cornwall, England
St. Austell Consols, St. Austell, Cornwall, England
Stamps and Jowl Zawn, Roscommon Cliff, St. Just, Cornwall, England
Stormy point, Alderly Edge, Cheshire, England
Tynebottom mine, Garrigill, Cumbria, England
Wheal Cock, Botallack, St. Just., Cornwall, England
Wheal Sparnon, Redruth, Illogan, Cornwall, England
Wheal Vor, Breage, Cornwall, England
Wherry mine, Newlyn, Cornwall, England
Wood mine, Alderley Edge, Cheshire, England
Mine Les Chalances, Allemont, Isère, France
Andreasberg, Harz Mtns., Niedersachsen, Germany
Anton mine, Heubachtal, Wittichen, Baden-Wuerttemberg, Germany
Bärensteinbruch quarry, Radautal, Bad Harzburg, Harz Mts, Sachsen, Germany
Clara mine, Oberwolfach, Baden-Wuerttemberg, Germany
Daniel mine, Schneeberg, Sachsen, Germany
Dreikönigstern, Reinerzau, Alpirsbach, Baden-Wuerttemberg, Germany
Eberhard mine, Alpirsbach, Baden-Wuerttemberg, Germany
Ferdinand mine, Alpirsbach, Baden-Wuerttemberg, Germany
Floßberg mine, Bad Lauterberg, Harz Mts, Sachsen, Germany
Geigeshalde / Falkenstein, Schramberg, Kinzigtal, Baden-Wuerttemberg, Germany
Hechtsberg quarry, Kinzigtal, Baden-Wuerttemberg, Germany
Heimberg quarry, Möncheholz, Langelsheim, Harz Mts, Sachsen, Germany
Herzog Friedrich mine, Reinerzau, Alpirsbach, Baden-Wuerttemberg, Germany
Herzog-Julius-Hütte, Goslar, Harz Mts, Sachsen, Germany
Hilfe Gottes mine, Wiemannsbucht, Bad Grund, Harz Mts, Sachsen, Germany
Johann mine, Wittichen, Baden-Wuerttemberg, Germany
Kafersteige mine, Pforzheim, Baden-Wuerttemberg, Germany
Kirchheimerstollen, Müllenbach, Baden-Baden, Baden-Wuerttemberg, Germany
Opal Lose, Hartenstein mine, Niederschlema, Sachsen, Germany
Rappold mine, Schneeberg, Sachsen, Germany
Rötenbach quarry, Alpirsbach, Baden-Wuerttemberg, Germany
Schweina-Glücksbrunn, Bad Liebenstein, Eisenach, Thüringen, Germany
St. Andreasberg, Hartz Mts, Niedersachsen, Germany
Uranlagerstatte Mullenbach, Baden-Baden, Germany
Wenzel mine, Oberwolfach, Baden-Wuerttemberg, Germany
Hilarion adit, Agios Konstandinos, Laurion, Attica, Greece
Bunmahon, Co. Waterford, Ireland
Muckross mine, Co. Kerry, Ireland
Silvermines district, Co. Tipperary, Ireland
Mina Sara Alicia, near Alamos, Sonora, Mexico
Bou Azzer, Morocco
Kongsberg, Buskerud, Norway
Dal'negorsk, Primorskiy Kray, Russia
Hilderston Quarry, West Lothian, Scotland
Leadhills-Wanlockhead district, Strathclyde/Dumfries and Galloway, Scotland
Needle's Eye Mine, Dumfries & Galloway, Scotland
Silver Glen, Clackmannanshire, Scotland
Whitesmith mine, Strontian, Argyll & Bute, Scotland
American Eagle Mine, Elk Mts. Area, Gunnison Co., Colorado, USA
Black Hawk district, Grant Co., New Mexico, USA
Blackbird District near Cobalt, Salmon, Lehmi Co., Idaho, USA
Creede/Rambler Mines etc, Encampment Area (Medicine Bow Mts.), Carbon Co., Wyoming, USA
Dubuque Area, Dubuque Co., Iowa, USA
French Creek Mines, Knauertown, Chester Co., Pennsylvania, USA
Galena General Area, Jo Davies Co., Illinois, USA
General Area, Franklin, Sussex Co., New Jersey, USA
Kelsey Mine, Azusa, Los Angeles Co., California, USA
Mohawk mine, Keweenaw Co., Michigan, USA
Old Cobalt Nickel Mine, Chatam, Middlesex Co., Connecticut, USA
Platteville Area, Iowa Co., Wisconsin, USA
San Bernardino Co., California, USA
Trail Creek mine area, Converse Co., Wyoming, USA
Viburnum No 27 mine, Iron Co., Missouri, USA
Viburnum Trend, Reynolds Co. & Iron Co., Missouri, USA
White Pine mine, Ontonagan Co., Michigan, USA
Bontddu trial level, Bontddu, Gwynedd, Wales
Cerig Yr Wyn Mine, Penbontrhydybeddau, Trefeirig, Dyfed, Wales
Clogau St. Davids mine, Bontddu, Gwynedd, Wales
Darren Mine, Penbontrhydybeddau, Parcel Canol, Dyfed, Wales
Gwaith Yr Afon mine, Penbontrhydybeddau, Trefeirig, Dyfed, Wales
Nantymwyn Mine, Rhandirmwyn, Llandovery, Dyfed, Wales
Panorama Mine, Barmouth, Gwynedd, Wales
Vigra Mine, Bontddu, Gwynedd, Wales