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Fornacite

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Mammoth-Saint Anthony Mine (Mammoth-St Anthony Mine; Mammoth Mine; St. Anthony Mine; Tiger property; Mammoth Gold Mines Ltd. property), St. Anthony deposit, Tiger, Mammoth District, Pinal Co., Arizona, USA
© 2003 R.O. Meyer

Show Fornacite Photos (28)
Formula:
Pb
 
2
Cu[OH|(AsO
 
4
,PO
 
4
)|CrO
 
4
]
System:MonoclinicColour:Deep olive-green; golden ...
Hardness:2 - 3
Name:After French colonial governor Lucien Fourneau.
This page provides mineralogical data about Fornacite.

Classification of Fornacite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:6/F.02-20
Nickel-Strunz 10th (pending) edition ID:7.FC.10

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
F : Chromates
C : With PO4, AsO4, SiO4
Dana 8th edition ID:43.4.3.2

43 : COMPOUND PHOSPHATES, ETC.
4 : Anhydrous Compound Phosphates, etc·, Containing Hydroxyl or Halogen
Hey's CIM Ref.:22.5.4

22 : Phosphates, Arsenates or Vanadates with other Anions
5 : Phosphates, arsenates or vanadates with chromate, molybdate, niobate or tantalate
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Type Occurrence of Fornacite

Type Locality:Brazzaville (Renéville; Djoué), Brazzaville Region (Renéville Region), Republic of Congo (Brazzaville)
General Appearance of Type Material:Confused groups of small, prismatic crystals.
Year of Discovery:1915
Associated Minerals at type locality:
Dioptase

Physical Properties of Fornacite

Colour:Deep olive-green; golden yellow in transmitted light (small grains).
Hardness (Mohs):2 - 3

Crystallography of Fornacite

Crystal System:Monoclinic
Cell Parameters:a = 7.91Å, b = 5.91Å, c = 17.46Å
Ratio:a:b:c = 1.338 : 1 : 2.954
Unit Cell Volume:V 0.00 ų (Calculated from Unit Cell)

Optical Data of Fornacite

Type:Biaxial (+)
RI values: nα = 2.140 nγ = 2.240
Birefringence:Strong
Maximum Birefringence:δ = 0.100

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:Strong
Comments:2V rather large.

Chemical Properties of Fornacite

Formula:
Pb
 
2
Cu[OH|(AsO
 
4
,PO
 
4
)|CrO
 
4
]
Essential elements:As, Cr, Cu, H, O, Pb
All elements listed in formula:As, Cr, Cu, H, O, P, Pb

Relationship of Fornacite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
7.FC.05Vauquelinite
Pb
 
2
Cu[OH|PO
 
4
|CrO
 
4
]
7.FC.10Molybdofornacite
Pb
 
2
Cu[OH|(AsO
 
4
,PO
 
4
)|(MoO
 
4
,CrO
 
4
)]
7.FC.15Hemihedrite
Pb
 
10
Zn[(F,OH)
 
2
|(CrO
 
4
)
 
6
|(SiO
 
4
)
 
2
]
7.FC.15Iranite
Pb
 
10
Cu[(F,OH)
 
2
|(CrO
 
4
)
 
6
|(SiO
 
4
)
 
2
]
7.FC.20Cassedanneite
Pb
 
5
[VO
 
4
|CrO
 
4
]
 
2
 · H
 
2
O
7.FC.20Embreyite
Pb
 
5
[PO
 
4
|CrO
 
4
]
 
2
 · H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
22.5.1Vauquelinite
Pb
 
2
Cu[OH|PO
 
4
|CrO
 
4
]
22.5.2Embreyite
Pb
 
5
[PO
 
4
|CrO
 
4
]
 
2
 · H
 
2
O
22.5.3Cassedanneite
Pb
 
5
[VO
 
4
|CrO
 
4
]
 
2
 · H
 
2
O
22.5.5Molybdofornacite
Pb
 
2
Cu[OH|(AsO
 
4
,PO
 
4
)|(MoO
 
4
,CrO
 
4
)]
22.5.6Mendozavilite
Na(Ca,Mg)
 
2
[Fe
 
6
(PO
 
4
)
 
2
(PMo
 
11
O
 
39
)(OH,Cl)
 
10
]·33H
 
2
O
22.5.7Paramendozavilite
NaAl
 
4
[Fe
 
7
(PO
 
4
)
 
5
(PMo
 
12
O
 
40
)(OH)
 
16
]·56H
 
2
O
22.5.8Betpakdalite
{Mg(H
 
2
O)
 
6
}Ca
 
2
(H
 
2
O)
 
13
[Mo
6+
8
As
5+
2
Fe
3+
3
O
 
36
(OH)](H
 
2
O)
 
4
22.5.9Natrobetpakdalite
(Na
 
2
,Ca)Fe
 
2
(As
 
2
Mo
 
6
O
 
28
)·15H
 
2
O
22.5.10Obradovicite
H
 
4
(K,Na)CuFe
 
2
AsO
 
4
(MoO
 
4
)
 
5
·12H
 
2
O
22.5.11Melkovite
CaFeH
 
6
(MoO
 
4
)
 
4
PO
 
4
·6H
 
2
O or near·
22.5.12Rankachite
(V
4+
 
,V
5+
 
)(W
6+
 
,Fe
3+
 
)
 
2
O
 
8
(OH)•(Ca
 
x
H
 
2
O
 
y
) with x ~ 0.5, y ~ 2.
22.5.13Olmsteadite
KFe
2+
2
(Nb
5+
 
,Ta
5+
 
)[O|PO
 
4
]
 
2
 · 2H
 
2
O
22.5.14Johnwalkite
K(Mn
2+
 
,Fe
2+
 
,Fe
3+
 
)
 
2
(Nb
5+
 
,Ta
5+
 
)[O|PO
 
4
]
 
2
 · 2(H
 
2
O,OH)

Other Names for Fornacite

Synonyms:
Furnacite
Other Languages:
Dutch:Fornaciet
German:Fornacit
Furnacit
Italian:Fornacite
Russian:Форнасит
Spanish:Fornacita
Furnacita

Other Information

Other Information:Totally soluble in HCl.
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 Fornacite

Reference List:Lacroix (1915) Bulletin de la Société française de Minéralogie: 38: 198.

Lacroix (1916) Bulletin de la Société française de Minéralogie: 39: 84.

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. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 652.

Bariand, P. and Herpin, P. (1962): Nouvelles données sur la fornacite (chromo-arseniate de plomb et de cuivre). Bull. Soc. Franc. Minéral., 85, 309-311. (in French).

American Mineralogist: 49: 447.

Zeitschrift für Kristallographie: 124: 385-397.

Articles/Blogs about Fornacite

Internet Links for Fornacite

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  • Raman and XRD data at RRUFF project
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  • Fornacite details from Handbook of Mineralogy (PDF)
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    Localities for Fornacite

    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
     
    • New South Wales
      • Yancowinna Co.
        • Broken Hill
    		Australian Min. 3:1 (1997)
    • Western Australia
      • Pilbara Region
        • Roebourne Shire
          • Whim Creek
    		No reference listed
    Chile
     
    • Atacama Region
      • Copiapó Province
        • Cachiyuyo de Llampos district
    		Maurizio Dini & Robert Jenkins collections; material analysed by Mr. Jenkins
    Germany
     
    • Hesse
      • Odenwald
        • Bensheim
          • Reichenbach
            • Hohenstein
    		Lapis, 12 (10), 23-32+58.
      • Spessart Mts
        • Freigericht
          • Altenmittlau
    • Saxony
      • Glauchau
        • Callenberg
    		Lapis, 16 (9), 13-26.
    Greece
     
    • Attikí (Attica; Attika) Prefecture
      • Lavrion (Laurion; Laurium) District
        • Lavrion District Mines
          • Sounion Area
            • Agia Varvara Mines (St Barbara Mines)
    		Lapis, 24, 7/8, (1999)
            • Sounion Mines
    		Lapis, 24, 7/8 (1999)
    Hungary
     
    • Fejér Co.
      • Szár Hill
        • Szabadbattyán
    		Szakáll: Minerals of Szár Hill, 2004
    Iran
     
    • Esfahan Province (Isfahan Province; Aspadana Province)
      • Anarak District
    P. Bariand and P. Herpin, Bull. Soc. Franç. Minér. Crist. , 1963, LXXXVI, pp. 133-135.
    • Khorasan (Khorassan; Khorasan va Sistan; Khurasan; Khorass; Khoras) Province
    		[MinRec 11:295]
    Italy
     
    • Piedmont
      • Torino Province
        • Canavese District
          • Chiusella Valley
            • Traversella
    		SEM/EDS 18/09/2001 MNHN-Paris
    Mexico
     
    • Sonora
      • Mun. de Moctezuma
        • Moctezuma
    		Lapis 2001(1), 11-40
    Morocco
     
    • Souss-Massa-Draâ Region
      • Ouarzazate Province
        • Tazenakht
          • Bou Azzer District
            • Oumlil
    		Favreau, G. and Dietrich, J. E. (2006). Die Mineralien von Bou Azzer. Lapis 31(7/8), 27-68
    Namibia
     
    • Otjikoto (Oshikoto) Region
      • Tsumeb
    		Min. Record (in press)
    Republic of Congo (Brazzaville)
     
    • Brazzaville Region (Renéville Region)
    		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: 652.
    South Africa
     
    • Gauteng Province
    		Minerals of South Africa
    UK
     
    • England
      • Somerset
        • Cranmore
    		Turner, R. (2006): A mechanism for the formation of the mineralized Mn deposits at Merehead Quarry, Cranmore, Somerset, England. Mineralogical Magazine 70, 629-653; Turner R.W. and Rumsey, M.S. (2007) Merehead Mineralogy - an Update. Russell Soc Newsletter, No 50, pp 17-18 (March 2007); Turner, R.W., (2006) A Mechanism for the formation of the Mineralised Mn Deposits at Merehead Quarry, Cranmore, Somerset, England. Min. Mag. vol. 70, no. 6, pp 629 - 653; UK Journal of Mines and Minerals (2006), no. 27, pp 6-7.
    USA
     
    • Arizona
      • Cochise Co.
        • Mule Mts
          • Warren District
            • Bisbee
    		Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 225; Graeme, R. (1981), Famous mineral localities: Bisbee, AZ, Min.Rec.: 12: 256-319.
      • Gila Co.
        • Dripping Spring Mts
          • Banner District
            • Hayden area
              • Hayden
    		Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 225.
      • La Paz Co.
        • New Water Mts
          • New Water District
            • Moore Mine group
    		Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 225.
      • Maricopa Co.
        • Big Horn Mts
          • Osborn District
            • Tonopah
              • Belmont Mountain
                • Tiger Wash
      • Pima Co.
        • Ajo District
          • Little Ajo Mts
    		Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 225.
        • Empire Mts
          • Empire District
            • Hilton (Lead Mountain)
              • Copper Camp
                • Hilton Mines (Hilton Mine group; Hiltano group; Hiltano & State of Maine group)
    		Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 225.
        • Tucson Mts
          • Amole District
            • Jaynes
    		Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 225.
            • Saguaro National Monument
    		Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 225; Bideaux, R.A., et al (1960), Some new occurrences of minerals of AZ, AZ Geol. Soc. Digest: 3: 53-56; Jones, D. (1983), The Old Yuma mine, Min.Rec.: 14: 95-107.
      • Pinal Co.
        • Mammoth District
          • Tiger
            • St. Anthony deposit
    		Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 225; Bideaux, R.A., et al (1960), Some new occurrences of minerals of Arizona, AZ Geol. Soc. Digest: 3: 53-56; Bideaux, R.A. (1980), Tiger, AZ, Min.Rec.: 11: 155-181;
        • Slate Mts
          • Casa Grande District
    		Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 225, 370.
        • Tohono O'odom (Papago) Indian Reservation
          • Vekol Mts
            • Vekol District
              • Copperosity Hills
                • Casa Grande
    		Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 225.
      • Yavapai Co.
        • Black Rock District
    		Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 225.
        • Bradshaw Mts (Bradshaw Range)
          • Castle Creek District
    • California
      • Inyo Co.
    		Raman ID 12-13-2007 on material personally collected by Tom Trebisky.
    [MinRec 32:393]
      • San Bernardino Co.
        • Baker
          • Section 2; T13N; R7E (SB)
    		The Blue Bell Claims San Bernardino County, California, Maynard, M., et al., pg. 44
    • Idaho
      • Clark Co.
        • Skull Canyon District
          • Kaufman
    		Ream, Lanny R. 2004. Idaho Minerals, 2nd edition, Revised and Updated
    • Montana
      • Beaverhead Co.
        • Argenta District
          • Argenta
            • Stapleton Gulch
    		http://www.mineralnews.com/MinNews/MN18-2.html
    • Nevada
      • Clark Co.
        • Alunite District
    		Richard W. Thomssen
        • Eldorado District
    		NBMG Spec. Pub. 31 Minerals of Nevada
        • Goodsprings District
    		NBMG Spec. Pub. 31 Minerals of Nevada
    NBMG Spec. Pub. 31 Minerals of Nevada
    Haynes, P. E. (2007):"Minerals of the Fredrickson Mine, Goodsprings District, Clark County, Nevada". New Mexico Geology 29(4),138.
    NBMG Spec. Pub. 31 Minerals of Nevada; Rocks & Minerals 83:1 pp 65-69
    Self collected by Brent Thorne
      • Elko Co.
        • Spruce Mountain District
      • Esmeralda Co.
    		NBMG Spec. Pub. 31 Minerals of Nevada
    NBMG Spec. Pub. 31 Minerals of Nevada
      • Humboldt Co.
        • Iron Point District
          • Valmy
    		Dr. William S. Wise presentation to Northwest Micro Mineral Study Group on 1 May 2004, Update on Mineralogy of the Silver Coin Mine, Iron Point District, Edna Mountains, Humboldt Co., Nevada
      • Nye Co.
        • Belmont District
    		NBMG Spec. Pub. 31 Minerals of Nevada
    • New Mexico
      • Hidalgo Co.
        • San Simon District
          • Granite Gap
    		R&M 77:5 p298-305
    Northrop, Minerals of New Mexico, 3rd Rev. Ed., 1996
        • Cooks Peak District
          • Old Hadley (Graphic) Mining District
    		Walstrom 2006 New Mexico Mineral Symposium abstracts
    Minerals of New Mexico 3rd ed.
      • Socorro Co.
        • North Magdalena District
    		Minerals of New Mexico 3rd ed.
    Minerals of New Mexico 3rd ed.
        • Socorro Peak District
    		Northrop, Minerals of New Mexico, 3rd Rev. Ed., 1996
    Uzbekistan
     
    • Tashkent (Toshkent) Viloyati
    		Pavel M. Kartashov data
    Mineral and/or Locality
    Google
     
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