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Pyroaurite

Big Photo

Wood's Chrome Mine (Wood's Mine), Texas, Little Britain Township, Lancaster Co., Pennsylvania, USA
© 2007, JGW

Show Pyroaurite Photos (27)
Formula:
Mg
 
6
Fe
3+
2
[(OH)
 
16
|CO
 
3
] · 4H
 
2
O
System:TrigonalColour:Yellow to ...
Lustre:Vitreous, Waxy, PearlyHardness:2½
Name:From the Greek for "fire" and "gold" in allusion to the golden-yellow color assumed on heating at relatively low temperatures.


Hydrotalcite Group. Fe3+ analogue of Desautelsite.

May originate as an alteration product of iowaite.

See also the related Sjögrenite and Brugnatellite.

Classification of Pyroaurite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:5/E.03-30
Nickel-Strunz 10th (pending) edition ID:5.DA.50

5 : CARBONATES (NITRATES)
D : Carbonates with additional anions, with H2O
A : With medium-sized cations
Dana 8th edition ID:16b.6.2.3

16b : HYDRATED CARBONATES CONTAINING HYDROXYL OR HALOGEN
6 : AmBn(XO3)pZqxH2O & with (m+n):p = 8:1
Hey's CIM Ref.:11.13.2

11 : Carbonates
13 : Carbonates of Fe
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Type Occurrence of Pyroaurite

Type Locality:Långban, Filipstad, Värmland, Sweden
Year of Discovery:1865

Physical Properties of Pyroaurite

Lustre:Vitreous, Waxy, Pearly
Diaphaneity (Transparency):Transparent
Colour:Yellow to brownish-white, white, gray, silver-white, greenish or colourless
Hardness (Mohs):2½
Cleavage:Perfect
{0001}
Density (measured):2.1 - 2.14 g/cm3
Density (calculated):2.12 g/cm3

Crystallography of Pyroaurite

Crystal System:Trigonal
Class (H-M):3m (3 2/m) - Hexagonal Scalenohedral
Space Group:R3m {R3 2/m}
Cell Parameters:a = 3.1094(2) Å, c = 23.4117(9) Å
Ratio:a:c = 1 : 7.529
Unit Cell Volume:V 196.03 ų (Calculated from Unit Cell)
Morphology:Tabular {0001} with lateral faces striated and indistinct. Also occurs thick tabular {0001} with {011¯5} alone, or with {202¯5}.
X-Ray Powder Diffraction:
d-spacingIntensity
7.6 (10)
3.89 (7)
2.62 (4)
2.33 (4)
1.981 (5)
1.556 (2)
Comments:Powder pattern indistinguishable from that of desautelsite (Mn3+-analogue).

Optical Data of Pyroaurite

Type:Uniaxial (-)
RI values: nω = 1.564 nε = 1.543
Maximum Birefringence:δ = 0.021

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Low
Pleochroism:Visible
Comments:O = pale yellowish, brownish, reddish
E = colourless

Chemical Properties of Pyroaurite

Formula:
Mg
 
6
Fe
3+
2
[(OH)
 
16
|CO
 
3
] · 4H
 
2
O
Essential elements:C, Fe, H, Mg, O
All elements listed in formula:C, Fe, H, Mg, O

Relationship of Pyroaurite to other Species

Member of Group:
Hydrotalcite Group:
Mg
 
6
R
3+
2
(OH)
 
16
CO
 
3
·4H
 
2
O, where R
3+
 
 = Al, Cr, or Fe
Related Minerals - Nickel-Strunz Grouping):

- +
5.DA.05Dypingite
Mg
 
5
[OH|(CO
 
3
)
 
2
]
 
2
 · 5H
 
2
O
5.DA.05Giorgiosite
Mg
 
5
[(CO
 
3
)
 
4
(OH)
 
2
] · 4H
 
2
O
5.DA.05Hydromagnesite
Mg
 
5
[(CO
 
3
)
 
4
(OH)
 
2
] · 4H
 
2
O
5.DA.05Widgiemoolthalite
Ni
 
5
[(CO
 
3
)
 
4
(OH)
 
2
] · 5H
 
2
O
5.DA.05UM1986-10-CO:ClHMgMnZn
Mg
 
5
(Zn,Mn)
 
3
(CO
 
3
)
 
2
(OH,Cl)
 
12
·H
 
2
O
5.DA.05UM1987-01-CO:HMgS
Mg
 
4
(CO
 
3
)
 
2
(OH)
 
2
·6H
 
2
O ?
5.DA.10Artinite
Mg
 
2
[(OH)
 
2
|CO
 
3
] · 3H
 
2
O
5.DA.10Indigirite
Mg
 
2
Al
 
2
[(CO
 
3
)
 
4
(OH)
 
2
] · 15H
 
2
O
5.DA.10Chlorartinite
[Mg
 
2
(CO
 
3
)(H
 
2
O)(OH)]Cl · H
 
2
O
5.DA.15Otwayite
Ni
 
2
CO
 
3
(OH)
 
2
·H
 
2
O
5.DA.15Zaratite
Ni
 
3
(CO
 
3
)(OH)
 
4
·4H
 
2
O
5.DA.20Kambaldaite
NaNi
 
4
(CO
 
3
)
 
3
(OH)
 
3
·3H
 
2
O
5.DA.25Callaghanite
Cu
 
2
Mg
 
2
[(OH)
 
6
|CO
 
3
] · 2H
 
2
O
5.DA.30Claraite
(Cu,Zn)
 
3
[(OH)
 
4
|CO
 
3
] · 4H
 
2
O
5.DA.35Hydroscarbroite
Al
 
14
(CO
 
3
)
 
3
(OH)
 
36
·nH
 
2
O
5.DA.35Scarbroite
Al
 
5
(OH)
 
13
CO
 
3
·5H
 
2
O
5.DA.40Caresite
Fe
2+
4
Al
 
2
[(OH)
 
12
|CO
 
3
] · 3H
 
2
O
5.DA.40Quintinite
Mg
 
4
Al
 
2
(OH)
 
12
CO
 
3
H
 
2
O
5.DA.40Charmarite
Mn
2+
4
Al
 
2
[(OH)
 
12
|CO
 
3
] · 3H
 
2
O
5.DA.45Barbertonite
Mg
 
6
(Cr,Al)
 
2
[(OH)
 
16
|CO
 
3
] · 4H
 
2
O
5.DA.45Brugnatellite
Mg
 
6
Fe
3+
 
[(OH)
 
13
|CO
 
3
] · 4H
 
2
O
5.DA.45Chlormagaluminite
(Mg,Fe
2+
 
)
 
4
Al
 
2
[(OH)
 
12
|(Cl
 
2
,CO
 
3
)] · 2H
 
2
O
5.DA.45Manasseite
Mg
 
6
Al
 
2
[(OH)
 
16
|CO
 
3
] · 4H
 
2
O
5.DA.45Sjögrenite
Mg
 
6
Fe
3+
2
[(OH)
 
16
|CO
 
3
] · 4H
 
2
O
5.DA.45Zaccagnaite
Zn
 
4
Al
 
2
(CO
 
3
)(OH)
 
12
·3H
 
2
O
5.DA.50Comblainite
(Ni
 
x
,Co
 
1-x
)(OH)
 
2
(CO
 
3
)
 
(1-x)/2
·nH
 
2
O
5.DA.50Desautelsite
Mg
 
6
Mn
3+
2
[(OH)
 
16
|CO
 
3
] · 4H
 
2
O
5.DA.50Hydrotalcite
Mg
 
6
Al
 
2
[(OH)
 
16
|CO
 
3
] · 4H
 
2
O
5.DA.50Reevesite
Ni
 
6
Fe
3+
2
[(OH)
 
16
|CO
 
3
] · 4H
 
2
O
5.DA.50Stichtite
Mg
 
6
Cr
 
2
[(OH)
 
16
|CO
 
3
] · 4H
 
2
O
5.DA.50Takovite
Ni
 
6
Al
 
2
[(OH)
 
16
|CO
 
3
] · 4H
 
2
O
5.DA.50UM1998-10-CO:CoHNi
Co
 
6
Fe
 
2
CO
 
3
(OH)
 
16
·4H
 
2
O ?
5.DA.55Coalingite
Mg
 
10
Fe
3+
2
[(OH)
 
24
|CO
 
3
] · 2H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
11.13.1Siderite
FeCO
 
3
11.13.3Sjögrenite
Mg
 
6
Fe
3+
2
[(OH)
 
16
|CO
 
3
] · 4H
 
2
O
11.13.4Brugnatellite
Mg
 
6
Fe
3+
 
[(OH)
 
13
|CO
 
3
] · 4H
 
2
O
11.13.5Coalingite
Mg
 
10
Fe
3+
2
[(OH)
 
24
|CO
 
3
] · 2H
 
2
O
11.13.6Ankerite
Ca(Fe
2+
 
 ,Mg,Mn
2+
 
)(CO
 
3
)
 
2

Other Names for Pyroaurite

Synonyms:
IgelströmitePiroaurite
Other Languages:
German:Pyroaurit
Russian:Пироаурит
Spanish:Pyroaurita
Varieties:
Chrome-Pyroaurite

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Pyroaurite

Reference List:Igelström (1865), Öfversigt af Svenska Vetenskaps Akademien Forhandlingar: 22: 608.

Aminoff and Broomé (1930), Svenska Vetenskapsakademien, Stockholm, Handlingar: 9(3), no. 5: 23.

Comucci P. (1930): - Ricerche sulla struttura della piroaurite. Periodico di Mineralogia - Roma pp. 143-148.

Frondel, C. (1941), American Mineralogist: 26: 295.

Palache, Charles, Harry Berman & Clifford Frondel (1944), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume I: Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, Inc., New York. 7th edition, revised and enlarged: 656-658.

Processi verbali della Società Toscana di scienze naturali in Pisa: 24: 92-105.

Acta Crystallographica (1968): B24: 972-977.

Internet Links for Pyroaurite

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    Localities for Pyroaurite

    Hide Locality List
    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Australia
     
    • Tasmania
      • Heazlewood district
    		Anderson, P., Bottrill, R. & Davidson, P. (2002): Famous mineral localities: The Lord Brassey mine, Tasmania. Mineralogical Record 33, 321-332 .
      • Zeehan District
        • Dundas mineral field
    		Bottrill RS & Baker, WE (in prep) Catalogue of Minerals of Tasmania. Mineral Resources Tasmania
        • North Dundas
          • Serpentine Hill
    		Bottrill RS & Baker, WE (in prep) Catalogue of Minerals of Tasmania. Mineral Resources Tasmania
    • Western Australia
      • Wiluna Shire
        • Mount Keith
    		Grguric, B.A. (2003) Minerals of the MKD5 nickel deposit, Mount Keith, Western Australia. Australian Journal of Mineralogy, Vol. 9, No. 2 , pg. 55-71.
    Austria
     
    • Styria
      • Fischbacher Alpen Mts
        • St. Jakob-Breitenau
          • Eibegggraben
    		Bojar, H.-P. & Postl, W. (2005)
      • Kirchdorf
        • Traföß
    		Post. W. & Bojar, H.-P. (2006)
      • Leoben
        • Kraubath
    		Exel, R. (1993); Taucher, J. & Hollerer, Ch. E. (2006)
    R. Exel: Die Mineralien und Erzlagerstätten Österreichs (1993)
    Canada
     
    • Ontario
      • Cochrane District
    		Mandarino, J.A. (1966): Canadian Mineralogist 8, 668-669.
      • Nipissing District
        • Mattawan Township
          • Mattawan
    		Geological Survey Of Canada Paper 70-50.
    No reference listed
    • Québec
      • Abitibi-Témiscamingue
        • Abitibi RCM
          • La Motte
    		Sabina (2003)126
              • Marbridge No. 1 mine
    		Mineral Record (1976) 7:4 pp174-178
      • Gatineau Co.
        • Wakefield Township
    		Geological Survey of Canada Miscellaneous Report 41
      • Laurentides
        • Antoine-Labelle RCM
          • Notre-Dame-du-Laus
    		Van Velthuizen, J. V. (1993): The Parker Mine, Notre Dame du Laus (Québec). Mineralogical Record, 24(5): 369-373.
        • Argenteuil RCM
          • Grenville-sur-la-Rouge
            • Kilmar
    		GSC Miscellaneous Report 33
      • Mégantic Co.
        • Coleraine Township
    		SABINA, A.P. (1967) Geological Survey of canada Paper, 66-51, 170p
    Finland
     
    • Länsi-Suomen Lääni
      • Siikainen
    Germany
     
    • Saxony
      • Erzgebirge
        • Freiberg District
          • Nossen
    		T. Witzke (2001): Pyroaurit von Siebenlehn bei Nossen, Sachsen.- Aufschluss 52, 45-48
    Italy
     
    • Aosta Valley
      • Montjovet
    		Piccoli, G.C., Maletto, G., Bosio, P., Lombardo, B. (2007). Minerali del Piemonte e della Valle d'Aosta. Associazione Amici del Museo "F. Eusebio" Alba, Ed., Alba (Cuneo) 607 pp.
    • Emilia-Romagna
      • Piacenza Province
        • Trebbia Valley
          • Coli
    		- Baldizzone, G. (2008): I minerali del piacentino – come riconoscerli dove trovarli. Baldizzone G., stampa Tipolito Farnese, Piacenza, 113 pp.; - Baldizzone, G. (2008): I minerali del piacentino – come riconoscerli dove trovarli. Baldizzone G., stampa Tipolito Farnese, Piacenza, 113 pp.
    • Piedmont
      • Torino Province
        • Canavese District
          • Léssolo
            • Cálea
    		"Le miniere di Brosso" I.Campostrini 2001 - ed. Museo Regionale Torino
    • Trentino-Alto Adige
      • Trento Province
        • Ala
          • Pilcante
    		Exel, R. (1987): Guida mineralogica del Trentino e del Sudtirolo. Athesia, Bolzano, 204 pp.
    • Veneto
      • Vicenza Province
        • Astico Valley
          • Cogollo del Cengio
            • Pedescala
    		M. Boscardin: Località mineralogiche consigliate: Le cave della val d'Astico - Notizie del Guppo Min. Lombardo - 10, Dec 1970, p. 7 - (This publication later changed its name in Rivista Minealogica Italiana)
        • Pasubio Mt.
          • Arco Romano
    		Pegoraro S. - Località mineralogiche consigliate: Cava Nido d'Aquila, (Vicenza) - Notizie del Gruppo Min. Lombardo, fasc. 3, Sept. 1974, pp. 60-61
        • Posina
          • Borcola Pass
    		M. Boscardin L, De Zen,A.Zordan I minerali della val Leogra e della val D'Astico. Schio (VIcenza) Dicembre 1989 pp.120
    Japan
     
    • Honshu Island
      • Chubu Region
        • Aichi prefecture
          • Shinshiro city
    • Kyushu Island
      • Fukuoka prefecture
    Morocco
     
    • Souss-Massa-Draâ Region
      • Ouarzazate Province
        • Tazenakht
    		XRD Paolo Orlandi (Pisa University)
            • Ightem
    		Favreau, G. and Dietrich, J. E. (2006). Die Mineralien von Bou Azzer. Lapis 31(7/8), 27-68
    Norway
     
    • Buskerud
      • Modum
        • Snarum
    		Eldjarn, K.(1988)." Etter Neumann". NAGS-nytt 15 (1-4),62 (in norwegian)
    Russia
     
    • Eastern-Siberian Region
      • Prebaikalia (Pribaikal'e)
        • Irkutskaya Oblast'
    		Mazurov, M.P., Grishina, S.N., Istomin, V.E., and Titov, A.T. (2007): Geology of Ore Deposits 49(4), 271-284.
    • Urals Region
      • Middle Urals
        • Ekaterinburgskaya (Sverdlovskaya) Oblast'
          • Asbest
    		Dana 7:I:654.
    Sweden
     
    • Dalarna
      • Ludvika
    		No reference listed
    No reference listed
    • Värmland
      • Filipstad
    		Kjell Gatedal
    Am Min 26 (1941); Nysten, P., Holtstam, D. and Jonsson, E. (1999) The Långban minerals. In Långban - The mines,their minerals, geology and explorers (D. Holtstam and J. Langhof, eds.), Swedish Museum of Natural History and Raster Förlag, Stockholm & Chr. Weise Verlag, Munich, pp. 89-183.
        • Nordmark
    		No reference listed
        • Pajsberg
    		Nysten, P. (2004): Harstigen ett mineralogisk eldorado i Bergslagen. Norsk Bergverksmuseum Skrift 28: 5-13
    Turkey
     
    • Mediterranean Region
      • Burdur Province
        • Taurus Mts
          • Doganbaba
    		American Mineralogist, Volume 61, pages 825-830, 1976
    UK
     
    • Scotland
      • Shetland Islands
        • Fetlar
    		No reference listed
    [Specimen in the Natural History Museum, London]
          • Baltasound-Haroldswick area
            • Hagdale
    		BMS Database
    USA
     
    • California
      • San Benito Co.
        • Diablo Range
          • New Idria District
            • Clear Creek area
    • Iowa
      • Sioux Co.
    		American Mineralogist: 52: 1261-1271.
    • Maryland
      • Cecil Co.
        • State Line District
    		Mineralogical Record Vol 12 #3 May/June 1981 pp149-156
    • New Jersey
      • Sussex Co.
        • Franklin Mining District
          • Ogdensburg
            • Sterling Hill
    		Dunn, P.J. & Leavens, P.B.: Min.Rec.:12:371-372 (1981); Frondel, C.: Mins. of Franklin & Sterling Hill, NJ - a checklist (1972): Dunn(1995):Pt4:623-624.
    • New York
      • New York City
        • Staten Island (Richmond Co.)
    		Collected by Steve Okulewicz
    • Pennsylvania
      • Lancaster Co.
        • Fulton Township
    		American Mineralogist 1965: 50: 1708-1716.
    Mineralogical Record (1981): 12(3): 149-156.
        • Little Britain Township
          • Texas
    		Lapham & Geyer, 1965. Mineral Collecting in Pennsylvania
      • Lebanon Co.
        • Cornwall
    		Lapham & Geyer, 1965. Mineral Collecting in Pennsylvania
    • Vermont
      • Orleans & Lamoille Cos.
        • Lowell & Eden
    		Rocks & Minerals: 21: 490; Rocks & Minerals: 22: 925; Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 264.
    Mineral and/or Locality
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    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 26th Oct 2009 15:26:04