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Lucien Louis Fourneau
Deep olive-green; golden ...
2 - 3
Named in 1916 by Antoine François Alfred Lacroix from the Latin fornax "the furnace" in honor of geographer and French colonial governor of Middle Congo (1911-16), Lucien Louis Fourneau [February 16, 1867, Saint-Cyr-l'Ecole, Yvelines, France - August 3, 1930, Perros-Guirec, Côtes-du-Nord [now Côtes-d'Armor], France], whose name also translates to "the furnace".
Fourneau was lieutenant governor of Oubangui-Chari (1909-10) and commissioner of French Cameroons (1916-19).
Isostructural with:
Fornacite-Vauquelinite Series. The arsenate analogue of vauquelinite.

Related to the Brackebuschite Group.

Classification of Fornacite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
F : Chromates
C : With PO4, AsO4, SiO4

4 : Anhydrous Compound Phosphates, etc·, Containing Hydroxyl or Halogen

22 : Phosphates, Arsenates or Vanadates with other Anions
5 : Phosphates, arsenates or vanadates with chromate, molybdate, niobate or tantalate URL:
Please feel free to link to this page.

Type Occurrence of Fornacite

General Appearance of Type Material:
Confused groups of small, prismatic crystals.
Year of Discovery:
Associated Minerals at Type Locality:

Occurrences of Fornacite

Geological Setting:
Oxidized zones of polymetallic deposits

Physical Properties of Fornacite

Resinous, Waxy, Greasy
Diaphaneity (Transparency):
Deep olive-green; golden yellow in transmitted light (small grains).
Olive green
Hardness (Mohs):
2 - 3
Irregular/Uneven, Conchoidal, Sub-Conchoidal
6.27 g/cm3 (Measured)    6.30 g/cm3 (Calculated)

Crystallography of Fornacite

Crystal System:
Class (H-M):
2/m - Prismatic
Space Group:
Space Group Setting:
P1 21/c 1
Cell Parameters:
a = 8.101(2) Å, b = 5.893(11) Å, c = 17.547(9) Å
β = 110.00(4)°
a:b:c = 1.375 : 1 : 2.978
Unit Cell Volume:
V 787.16 ų (Calculated from Unit Cell)
Short bladed crystals in divergent groupings.
Other cell given: 7.91, 5.91, 17.46 A, xxx°.
X-Ray Powder Diffraction Data:
8.22 (50)
4.80 (90)
3.31 (100)
2.98 (100)
2.88 (100)
2.80 (100)
2.71 (90)

Optical Data of Fornacite

Biaxial (+)
RI values:
nα = 2.142 nγ = 2.242
Max Birefringence:
δ = 0.100
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
2V rather large.

Chemical Properties of Fornacite

All elements listed in formula:

Relationship of Fornacite to other Species

Forms a series with Vauquelinite (see here)
7.FC.20CassedanneitePb5(CrO4)2(VO4)2 · H2O
7.FC.20EmbreyitePb5(CrO4)2(PO4)2 · H2O
22.5.2EmbreyitePb5(CrO4)2(PO4)2 · H2O
22.5.3CassedanneitePb5(CrO4)2(VO4)2 · H2O
22.5.7ParamendozaviliteNaAl4Fe7(PO4)5(PMo12O40)(OH)16 · 56H2O
22.5.12RankachiteCa0.5(V4+,V5+)(W6+,Fe3+)2O8(OH) · 2H2O
22.5.13OlmsteaditeKFe22+(Nb5+,Ta5+)(PO4)2O2 · 2H2O
22.5.14JohnwalkiteK(Mn2+,Fe2+,Fe3+)2(Nb5+,Ta5+)(PO4)2O2 · 2(H2O,OH)

Other Names for Fornacite

Name in Other Languages:

Other Information

Not Fluorescent in UV.
Other Information:
Totally soluble in HCl.
Health Risks:
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.

Internet Links for Fornacite

Localities for Fornacite

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 for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
  • New South Wales
    • Yancowinna Co.
      • Broken Hill
Australian Min. 3:1 (1997)
  • Western Australia
    • Leonora Shire
      • Ten Mile Outcamp
Nickel, E.H. (1982) Secondary minerals from the oxidized zone of the Teutonic Bore sulphide deposit. The Australian Mineralogist, No. 40, December 1982, pg. 219-223.
    • Roebourne Shire
      • Whim Creek
No reference listed
  • Atacama Region
    • Copiapó Province
      • Cachiyuyo de Llampos district
Maurizio Dini & Robert Jenkins collections; material analysed by Mr. Jenkins
  • Hesse
    • Odenwald
      • Lautertal (Odenwald)
        • Reichenbach
          • Hohenstein
Lapis, 12 (10), 23-32+58.
    • Spessart
      • Freigericht
        • Altenmittlau
  • Saxony
    • Glauchau
      • Callenberg
Lapis, 16 (9), 13-26.
  • Attikí Prefecture (Attica; Attika)
    • Lavrion District (Laurion; Laurium)
      • Lavrion District Mines
        • Agios Konstantinos [St Constantine] (Kamariza)
          • Kamariza Mines (Kamareza Mines)
            • Hilarion area
Fritz Schrieber
        • Sounion Area
          • Agia Varvara Mines (St Barbara Mines)
Schnorrer, G. & Breitenbach, H. (1996): Lavrion: Neufunde aus dem antiken Bergbau und in historischen Schlacken. Lapis, 21 (1), 45-48; 62.; Lapis, 24, 7/8, (1999)
Hanke, H. (1998): Laurion - ein Rückblick auf die Funde der letzten drei Jahre. Mineralien-Welt, 9 (2), 37-45.
Wendel, W. & Markl, G. (1996): Eine Antimonit-Paragenese und weitere Neufunde aus Lavrion. Lapis, 21 (11), 40-42; 62.; Branko Rieck Collection
Lapis, 24, 7/8 (1999)
  • Fejér Co.
    • Szár Hill
      • Szabadbattyán
Szakáll: Minerals of Szár Hill, 2004; Sánoor Szakáll, Mária Foldvári, Gábor Papp, Péter Kovács-pálffy, Árpád Kovács (1997) Secondary Sulphate Minerals From Hungary. Acta Mineralogica-petrographica, Szeged, Xxxviii, Supplementum, 7-63.
  • Esfahan Province (Isfahan Province; Aspadana Province)
    • Nain County (Nayin County)
      • Anarak District
P. Bariand and P. Herpin, Bull. Soc. Franç. Minér. Crist. , 1963, LXXXVI, pp. 133-135.
  • Yazd Province
    • Nayband (Neyband)
Bariand, P. & Poullen, J.F. (1980): Rare Chromates from Seh-Changi, Iran. Mineralogical Record 11, 293-297
  • Piedmont
    • Torino Province
      • Canavese District
        • Chiusella Valley
          • Traversella
SEM/EDS 18/09/2001 MNHN-Paris
  • Tuscany
    • Livorno Province
      • Campigliese (Campiglia Mountains; Campiglia Ridge)
        • Campiglia Marittima
Dini A., Senesi F. (2013): I giacimenti di Sn-W-As. Monte Valerio, Pozzatello, Santa Caterina, Botro ai Marmi e Campo alle Buche. Riv. Mineral. Ital., 37, 1 (1-2013), 84-92.
  • Sonora
    • Mun. de Moctezuma
      • Moctezuma
Lapis 2001(1), 11-40
  • Souss-Massa-Draâ Region
    • Ouarzazate Province
      • Tazenakht
        • Bou Azer District (Bou Azzer District)
          • Oumlil
Favreau, G. and Dietrich, J. E. (2006). Die Mineralien von Bou Azzer. Lapis 31(7/8), 27-68
  • Erongo Region
    • Swakopmund District
      • Namib-Naukluft National Park
Bezing, L. von, Bode, R. & Jahn, S. (2008): Namibia Minerals and Localities. Edition Schloss Freudenstein, Bode Verlag GmbH, Haltern, 338 pp. (in English)
  • Otjikoto Region (Oshikoto)
    • Tsumeb
Min. Record (in press)
Republic of Congo (Brazzaville)
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.
  • Pool Department
    • Kindanba District
      • Renéville
Lacroix (1915) Bulletin de la Société française de Minéralogie: 38: 198.
  • Urals Region
    • Middle Urals
      • Sverdlovskaya Oblast'
        • Ekaterinburg (Sverdlovsk)
          • Berezovskii (Berezovskii Zavod)
Клейменов Д.А., Ерохин Ю. В., Прибавкин С.В. Форнасит из зоны окисления Березовского золоторудного месторождения. // Уральская летняя минералогическая школа-97, 1997, с.96-98.; Pavel M. Kartashov analytical data (2011)
              • Uspenskaya Mt
Pavel M. Kartashov analytical data (2012)
South Africa
  • Mpumalanga Province
    • Nkangala District
      • Delmas
Minerals of South Africa
  • North West Province
    • Bojanala Platinum District
      • Western Bushveld Complex
        • Rustenburg (Rustenburg District)
          • Olifantspoort Farm
Reeks, G. (2007) Olifantspoort Mine, Olifantspoort, Northern Province. South African Micromount Society newsletter: 33(3)
  • England
    • Somerset
      • Cranmore
Turner, R.W. and Rumsey, M.S. (2010): Mineral Relationships in the Mendip Hills. Journal of the Russell Society, vol 13, pp 3-46; 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); UK Journal of Mines and Minerals (2006), no. 27, pp 6-7.
  • Arizona
    • Cochise Co.
      • Dragoon Mts
        • Johnny Lyon Hills
          • Tres Alamos Wash
Robert Jenkins Raman Spectroscopy
      • Little Dragoon Mts
        • Cochise District
          • Dragoon
Rolf Luetcke
      • 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.
      • Tombstone Hills
        • Tombstone District
Rob Bowell, lab tested
    • Gila Co.
      • Dripping Spring Mts
        • Banner District
          • Hayden area
            • Chilito
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 225.
      • Payson District (Green Valley District)
        • Oxbow Estates area
          • Lousy Gulch
Williams, S. A. (1981): Duhamelite, Cu4Pb2Bi(VO4)4(OH)3.8H2O, a new Arizona mineral. Mineralogical Magazine 44, 151-152.
    • La Paz Co.
      • Granite Wash Mts
        • Ellsworth District
Mineral collected by Jerry A. Baird
      • New Water Mts
Hunt, W. (1983) Calciovolborthite from the New Water Mountains Yuma County, Arizona. Mineralogical Record 14:119
          • Moore Mine group
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 225.
      • Trigo Mts
        • Silver District
XRD analysis by Dr. Anthony Kampf.
    • Maricopa Co.
      • Big Horn Mts
        • Osborn District
          • Tonopah
            • Belmont Mountain
              • Tiger Wash
Bob Meyer (2012) Micro Mineral Collector. Friends of Mineralogy National Newsletter 42:10-13; Mineral News (2002) 18-1 pp1,5-7
Yang, H., Downs, R.T., Evans, S.H., Jenkins, R.A., Bloch, E.M. (2013): Rongibbsite, Pb2(Si4Al)O11(OH), a new zeolitic aluminosilicate mineral with an interrupted framework from Maricopa County, Arizona, U.S.A. American Mineralogist, 98, 236-241
      • Painted Rock Mts
        • Painted Rock District
          • Theba
EDS analysis Association Jean WYART, Paris - specimen Georges FAVREAU
    • 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;
      • Tohono O'odham Indian Reservation
        • Silver Reef District
          • Tat Momoli Mts
            • Chuichu area
              • Silver Reef Mountains area
                • White Horse Pass area
Collected by and in the collection of Brent Thorne
        • Slate Mts
          • Casa Grande District
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 225, 370.
        • Vekol Mts
          • Vekol District
            • Kohatk
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 225.
R. D. Green
    • Yavapai Co.
      • Black Rock District
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 225.
      • Bradshaw Mts (Bradshaw Range)
        • Castle Creek District
          • Copperopolis
Handbook of Mineralogy
  • California
    • Inyo Co.
      • Inyo Mts (Inyo Range)
        • Malpais Mesa
Steve Stuart.
        • Russ District
          • Reward
Raman ID 12-13-2007 on material personally collected by Tom Trebisky.; Adams, Paul (2010) The Brown Monster and Reward Mines Inyo County, California. Mineralogical Record 41:175-193.; Adams, Paul (2010) The Brown Monster and Reward Mines Inyo County, California. Mineralogical Record 41:175-193.
      • Panamint Mts (Panamint Range)
        • Cottonwood Mts
          • Ubehebe District
            • Big Dodd Spring
[MinRec 32:393]
    • San Bernardino Co.
      • Baker
        • Otto Mountain
Joe Marty specimens
Collected by and in the collection of Brent Thorne.
      • Soda Lake Mts
        • Baker
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
  • Nevada
    • Clark Co.
      • Alunite District
Richard W. Thomssen; Robert M. Housley (2005) Recent rare mineral finds in southern California and Nevada desert mines. Abstracts from the 2005 Desert Symposium. California State University, Desert Studies Consortium and LSA Associates, Inc.
      • Eldorado Mts
        • Eldorado District (Colorado District)
NBMG Spec. Pub. 31 Minerals of Nevada
Rolf Luetcke
Collected by Joe Marty.
      • Spring Mts
        • Goodsprings District
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.
          • Goodsprings
NBMG Spec. Pub. 31 Minerals of Nevada
Collected by and in the collection of Brent Thorne.
John Hagstrom collection, 2015
NBMG Spec. Pub. 31 Minerals of Nevada; Rocks & Minerals 83:1 pp 65-69
Self collected by Brent Thorne
    • Elko Co.
      • Spruce Mountain District
NBMG Spec. Pub. 31 Minerals of Nevada
    • 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.
      • Toquima Range
        • Belmont District
          • Belmont
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 (Cooke's 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.
        • Silver Hill area
Minerals of New Mexico 3rd ed.
      • Socorro Peak District
Northrop, Minerals of New Mexico, 3rd Rev. Ed., 1996
  • Utah
    • Juab Co.
      • East Tintic Mts
        • Tintic District
          • Mammoth
Ron Layton
  • Tashkent Viloyati (Toshkent)
    • Almalyk
Pavel M. Kartashov data
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