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Pyroaurite

Big Photo

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

Show Pyroaurite Photos (23)
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.

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 (Mn2+-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

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.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.55Coalingite
Mg
 
10
Fe
3+
2
[(OH)
 
24
|CO
 
3
] · 2H
 
2
O
5.DA.60Karchevskyite
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
German names:
Pyroaurit
Russian names:
Пироаурит
Spanish names:
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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  • Raman and XRD data at RRUFF project
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  • Search for Pyroaurite in the Natural History Museum (London) online catalogue
  • Pyroaurite details from Handbook of Mineralogy (PDF)
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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.
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    (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
    		Andersen, P., Bottrill, R. & Davidson, P. (2002): Famous mineral localities: The Lord Brassey mine, Tasmania. Mineral. Rec. 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
    Austria
     
    • Styria
      • Fischbacher Alpen Mts
        • St. Jakob-Breitenau
    		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
      • Nipissing District
        • Mattawan Township
          • Mattawan
    		Geological Survey Of Canada Paper 70-50.
    No reference listed
    • Québec
      • Labelle Co.
        • Bigelow Township
          • Notre Dame du Laus
    		No reference listed
      • Mégantic Co.
        • Coleraine Township
    		SABINA, A.P. (1967) Geological Survey of canada Paper, 66-51, 170p
      • Stanstead Co.
        • Wakefield
    		Geological Survey of Canada Miscellaneous Report 41
    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
     
    • 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
      • Altayskiy Kray
        • Bashenowo (Belojarsk; Belojarskij; Beloyarsk)
    		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
    		No reference listed
    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.
        • New Idria District
          • Clear Creek area
    • 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 Borough
          • Richmond Co.
    		Collected by Steve Okulewicz
    • Pennsylvania
      • Lancaster Co.
        • Fulton Township
    		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
      • Lamoille & Orleans Cos.
        • Lowell & Eden Mills
    		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
    Google
     
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