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Fizélyite

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Formula:
Ag
 
5
Pb
 
14
Sb
 
21
S
 
48
System:MonoclinicColour:Lead grey to steel gray
Hardness:2
Name:
After Sándor Fizély (1856–1918), Hungarian mining engineer, who discovered the mineral.
This page provides mineralogical data about Fizélyite.

Classification of Fizélyite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:2/E.23-20
Nickel-Strunz 10th (pending) edition ID:2.JB.40a

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
J : Sulfosalts of PbS archetype
B : Galena derivatives, with Pb
Dana 7th edition ID:3.4.15.8
Dana 8th edition ID:3.4.15.8

3 : SULFOSALTS
4 : ø = 3
Hey's CIM Ref.:5.7.27

5 : Sulphosalts - Sulpharsenites and Sulphobismuthites (those containing Sn, Ge,or V are in Section 6)
7 : Sulpharsenites etc. of Pb and other metals
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Type Occurrence of Fizélyite

Type Locality:Herja Mine, Chiuzbaia (Kisbánya), Baia Mare (Nagybánya), Maramureș Co., Romania

Occurrences of Fizélyite

Geological Setting:Hydrothermal veins

Physical Properties of Fizélyite

Lustre:Metallic
Diaphaneity (Transparency):Opaque
Colour:Lead grey to steel gray
Streak:Dark grey
Hardness (Mohs):2
Tenacity:Very brittle
Cleavage:Distinct/Good
On {101}, quality not stated.
Density (measured):5.56 g/cm3
Density (calculated):5.224 g/cm3

Crystallography of Fizélyite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Cell Parameters:a = 13.21Å, b = 19.27Å, c = 8.68Å
β = 90.4°
Ratio:a:b:c = 0.686 : 1 : 0.45
Unit Cell Volume:V 2,209.50 ų (Calculated from Unit Cell)
Z:2
Morphology:Small, deeply striated prisms without terminal faces. Ropey bent and twisted laths. Terminated crystals from Van Silver mine, Canada.
Twinning:On {010} with two sets of polysynthetic twins parallel to [001] and {001}

Optical Data of Fizélyite

Type:Anisotropic
Anisotropism:Without distinct color effects

Chemical Properties of Fizélyite

Formula:
Ag
 
5
Pb
 
14
Sb
 
21
S
 
48
Simplified for copy/paste:Ag5Pb14Sb21S48
Essential elements:Ag, Pb, S, Sb
All elements listed in formula:Ag, Pb, S, Sb

Relationship of Fizélyite to other Species

Common Associates:
SphaleriteSemseyiteQuartzPyrrhotitePyrite
GalenaDolomite
Related Minerals - Nickel-Strunz Grouping):

- +
2.JB.05Diaphorite
Ag
 
3
Pb
 
2
Sb
 
3
S
 
8
2.JB.10Cosalite
Pb
 
2
Bi
 
2
S
 
5
2.JB.15Freieslebenite
AgPbSbS
 
3
2.JB.15Marrite
AgPbAsS
 
3
2.JB.20Cannizzarite
Pb
 
4
Bi
 
6
S
 
13
2.JB.20Wittite
Pb
 
9
Bi
 
12
(S,Se)
 
27
2.JB.25aJunoite
Cu
 
2
Pb
 
3
Bi
 
8
(S,Se)
 
16
2.JB.25iNeyite
Ag
 
2
Cu
 
6
Pb
 
25
Bi
 
26
S
 
68
2.JB.25cNordströmite
CuPb
 
3
Bi
 
7
(Se
 
4
S
 
10
)
2.JB.25gNuffieldite
Cu
 
1.4
Pb
 
2.4
Bi
 
2.4
Sb
 
0.2
S
 
7
2.JB.25dProudite
CuPb
 
7.5
Bi
 
9.33
(S,Se)
 
22
2.JB.25hWeibullite
Pb
 
5
Bi
 
8
Se
 
7
S
 
11
2.JB.25bFelbertalite
Cu
 
2
Pb
 
6
Bi
 
8
S
 
19
2.JB.25jRouxelite
Cu
 
2
HgPb
 
23
Sb
 
27
S
 
65.5
2.JB.25fÁngelaite
Cu
 
2
AgPbBiS
 
4
2.JB.25iCuproneyite
Cu
 
7
Pb
 
27
Bi
 
25
S
 
68
2.JB.30aGeocronite
Pb
 
14
(Sb,As)
 
6
S
 
23
2.JB.30aJordanite
Pb
 
14
(As,Sb)
 
6
S
 
23
2.JB.30bKirkiite
Pb
 
10
Bi
 
3
As
 
3
S
 
19
2.JB.30cTsugaruite
Pb
 
4
As
 
2
S
 
7
2.JB.35cPillaite
Pb
 
9
Sb
 
10
S
 
23
ClO
 
0.5
2.JB.35aZinkenite
Pb
 
9
Sb
 
22
S
 
42
2.JB.35bScainiite
Pb
 
14
Sb
 
30
S
 
54
O
 
5
2.JB.35dPellouxite
(Cu,Ag)Pb
 
10
Sb
 
12
S
 
27
O(Cl,S)
 
0.6
2.JB.35fTubulite
Ag
 
2
Pb
 
22
Sb
 
20
S
 
53
2.JB.35eChovanite
Pb
 
15-2x
Sb
 
14+2x
S
 
36
O
 
x
(x ~ 0.2)
2.JB.40bAschamalmite
Pb
 
6
Bi
 
2
S
 
9
2.JB.40aBursaite
Pb
 
5
Bi
 
4
S
 
11
(?)
2.JB.40bEskimoite
Ag
 
7
Pb
 
10
Bi
 
15
S
 
36
2.JB.40aGustavite
Ag
 
3
Pb
 
5
Bi
 
11
S
 
24
2.JB.40aLillianite
Pb
 
3-2x
Ag
 
x
Bi
 
2+x
S
 
6
2.JB.40cOurayite
Ag
 
3
Pb
 
4
Bi
 
5
S
 
13
2.JB.40aRamdohrite
(Cd,Mn,Fe)Ag
 
5.5
Pb
 
12
Sb
 
21.5
S
 
48
2.JB.40aRoshchinite
Ag
 
19
Pb
 
10
Sb
 
51
S
 
96
2.JB.40dSchirmerite
PbAgBi
 
3
S
 
6
- Pb
 
3
Ag
 
1.5
Bi
 
3.5
S
 
9
2.JB.40aTreasurite
Ag
 
7
Pb
 
6
Bi
 
15
S
 
32
2.JB.40aUchucchacuaite
AgMnPb
 
3
Sb
 
5
S
 
12
2.JB.40eUstarasite
Pb(Bi,Sb)
 
6
S
 
10
(?)
2.JB.40aVikingite
Ag
 
5
Pb
 
8
Bi
 
13
S
 
30
2.JB.40aXilingolite
Pb
 
3
Bi
 
2
S
 
6
2.JB.40bHeyrovskýite
Pb
 
10
AgBi
 
5
S
 
18
2.JB.40UM1988-05-S:AgBiCuHgPb
(Hg,Ag,Cu,Pb)
 
5
Pb
 
5
Bi
 
11
S
 
27
2.JB.40UM1988-06-S:AgBiCuHgPb
(Pb,Hg)
 
12
(Cu,Ag)
 
3
(Bi,Sb)
 
10
(S,Te)
 
27
2.JB.40aAndorite IV
Pb
 
18
Ag
 
15
Sb
 
47
S
 
96
2.JB.55Gratonite
Pb
 
9
As
 
4
S
 
15
2.JB.60Marrucciite
Hg
 
3
Pb
 
16
Sb
 
18
S
 
46
2.JB.65Vurroite
Pb
 
20
Sn
 
2
(Bi,As)
 
22
S
 
54
Cl
 
6
Related Minerals - Hey's Index Grouping:

- +
5.7.1Seligmannite
PbCuAsS
 
3
5.7.2Bournonite
PbCuSbS
 
3
5.7.3Meneghinite
Pb
 
13
CuSb
 
7
S
 
24
5.7.4Gladite
PbCuBi
 
5
S
 
9
5.7.5Lindströmite
Pb
 
3
Cu
 
3
Bi
 
7
S
 
15
5.7.6Krupkaite
PbCuBi
 
3
S
 
6
5.7.7Hammarite
Pb
 
2
Cu
 
2
Bi
 
4
S
 
9
5.7.8Friedrichite
Pb
 
5
Cu
 
5
Bi
 
7
S
 
18
5.7.9Aikinite
PbCuBiS
 
3
5.7.10Nuffieldite
Cu
 
1.4
Pb
 
2.4
Bi
 
2.4
Sb
 
0.2
S
 
7
5.7.11Jaskólskiite
Pb
 
2+x
Cu
 
x
(Sb,Bi)
 
2-x
S
 
6
(x = 0.2)
5.7.12Tintinaite
Pb
 
22
Cu
 
4
(Sb,Bi)
 
30
S
 
69
5.7.13Kobellite
Pb
 
22
Cu
 
4
(Bi,Sb)
 
30
S
 
69
5.7.14Proudite
CuPb
 
7.5
Bi
 
9.33
(S,Se)
 
22
5.7.15Nordströmite
CuPb
 
3
Bi
 
7
(Se
 
4
S
 
10
)
5.7.16Watkinsonite
Cu
 
2
PbBi
 
4
(Se,S,Te)
 
8
5.7.17Pekoite
PbCuBi
 
11
(S,Se)
 
18
5.7.18Petrovicite
Cu
 
3
HgPbBiSe
 
5
5.7.19Eclarite
(Cu,Fe)Pb
 
9
Bi
 
12
S
 
28
5.7.20Marrite
AgPbAsS
 
3
5.7.21Baumhauerite-2a
Pb
 
11
Ag(As,Sb)
 
18
S
 
36
5.7.22Andorite
PbAgSb
 
3
S
 
6
5.7.23Ramdohrite
(Cd,Mn,Fe)Ag
 
5.5
Pb
 
12
Sb
 
21.5
S
 
48
5.7.24Roshchinite
Ag
 
19
Pb
 
10
Sb
 
51
S
 
96
5.7.25Ourayite
Ag
 
3
Pb
 
4
Bi
 
5
S
 
13
5.7.26Eskimoite
Ag
 
7
Pb
 
10
Bi
 
15
S
 
36
5.7.28Owyheeite
Ag
 
3+x
Pb
 
10-2x
Sb
 
11+x
S
 
28
, -0.13 +0.20
5.7.29Freieslebenite
AgPbSbS
 
3
5.7.30Diaphorite
Ag
 
3
Pb
 
2
Sb
 
3
S
 
8
5.7.31Sterryite
Ag
 
2
Pb
 
10
(Sb,As)
 
12
S
 
29
5.7.32Vikingite
Ag
 
5
Pb
 
8
Bi
 
13
S
 
30
5.7.33Zoubekite
AgPb
 
4
Sb
 
4
S
 
10
5.7.34Schirmerite
PbAgBi
 
3
S
 
6
- Pb
 
3
Ag
 
1.5
Bi
 
3.5
S
 
9
5.7.36Gustavite
Ag
 
3
Pb
 
5
Bi
 
11
S
 
24
5.7.37Kitaibelite
Ag
 
10
PbBi
 
30
S
 
51
5.7.38Treasurite
Ag
 
7
Pb
 
6
Bi
 
15
S
 
32
5.7.39Benjaminite
(Ag,Cu)
 
3
(Bi,Pb)
 
7
S
 
12
5.7.40Lengenbachite
Ag
 
4
Cu
 
2
Pb
 
18
As
 
12
S
 
39
·
5.7.41Berryite
Cu
 
3
Ag
 
2
Pb
 
3
Bi
 
7
S
 
16
5.7.42Neyite
Ag
 
2
Cu
 
6
Pb
 
25
Bi
 
26
S
 
68
5.7.43Larosite
(Cu,Ag)
 
21
(Pb,Bi)
 
2
S
 
13
5.7.44Cupropavonite
AgCu
 
2
PbBi
 
5
S
 
10
5.7.45Padĕraite
Cu
 
5.9
Ag
 
1.3
Pb
 
1.6
Bi
 
11.2
S
 
22
5.7.46Rayite
Pb
 
8
(Ag,Tl)
 
2
Sb
 
8
S
 
21
5.7.47Rathite
Pb
 
8
Pb
 
4-x
(Tl
 
2
As
 
2
)
 
x
(Ag
 
2
As
 
2
)As
 
16
S
 
40
5.7.48Hatchite
AgTlPbAs
 
2
S
 
5
Related Minerals - Dana Grouping):

- +
3.4.15.1Lillianite
Pb
 
3-2x
Ag
 
x
Bi
 
2+x
S
 
6
3.4.15.4Andorite
PbAgSb
 
3
S
 
6
3.4.15.7Roschinite

Other Names for Fizélyite

Synonyms:
Fyzelyite
Other Languages:
German:Fizélyit
Fyzelyit
Spanish:Fizélyita
Fyzelyita

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 Fizélyite

Reference List:

- +
Krenner and Loczka (1926), Mat. Termés. Ért.: 42: 18.

Krenner and Loczka (1926), Min. Abs.: 3: 8.

American Mineralogist (1930): 15: 83.

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: 450-451.

American Mineralogist (1985): 70: 219-220.

Yang H, Downs R T, Burt J B, Costin G (2009): Structure refinement of an untwinned single crystal of Ag-excess fizélyite, Ag5.94Pb13.74Sb20.84S48. The Canadian Mineralogist, 47, 1257-1264. (PDF available at RRUFF)

Nespolo, M., Ozawa, T., Kawasaki, Y., Sugiyama, K. (2012): Structural relations and pseudosymmetries in the andorite homologous series. Journal of Mineralogical and Petrological Sciences 107, 226-243.

Mindat.org articles about Fizélyite

Article entries:
Fizelyite recently discovered at the Blue Light Mine, Silverado Canyon, Orange CRobert Housley

Internet Links for Fizélyite

Search Engines:
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  • Look for Fizélyite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Fizélyite details from Handbook of Mineralogy (PDF)
  • Mineral Dealers:
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  • Search for Fizélyite on Well-Arranged Molecules
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  • Specimens:The following Fizélyite specimens are currently listed for sale on minfind.com.

    Localities for Fizélyite

    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.
    Argentina
     
    • Jujuy
      • Rinconada Department
        • Pirquitas Ag-Sn Deposit
    Amer.Min.(2000) 85, 1066-1075
    Bolivia
     
    • Oruro Department
      • Cercado Province
        • Oruro City
    Kempff, O., Paar, W.H., Tawackoli, S.: "Minerales de Bolivia", 115pp (La Paz, 2009)
    • Potosí Department
      • Antonio Quijarro Province
        • Agua de Castilla
    Salomon Rivas y Federico Ahlfeld (1998) Los Minerales de Bolivia y sus Parajes. (Santa Cruz)
      • Potosí City
    Kempff, O., Paar, W.H., Tawackoli, S.: "Minerales de Bolivia", 115pp (La Paz, 2009)
      • Sud Chichas Province
        • Atocha-Quechisla District
    Kempff, O., Paar, W.H., Tawackoli, S.: "Minerales de Bolivia", 115pp (La Paz, 2009)
    Salomon Rivas y Federico Ahlfeld (1998) Los Minerales de Bolivia y sus Parajes. (Santa Cruz)
      • Sud Lípez Province
        • Buena Vista
    USGS Bulletin # 1975.
        • San Pablo de Lípez
          • Santa Isabel district
    Geology and Mineral Resources of the Altiplano and Cordillera Occidental, Bolivia (USGS Bulletin no. 1975)
    Bulgaria
     
    • Kardzhali Oblast (Kurdzhali; Kărdžali; Kurdjali)
      • Momchilgrad Obshtina
    Strashimirov, S., Dobrev, S., Stemenov, S., & Dragiev, H. (2005). Silver-bearing minerals from the ore body “North” in Sedefche epithermal Au-Ag deposit (eastern Rhodopes). Annual of the University of Mining and Geology “St. Ivan Rilski, 48, 143-148.
    Canada
     
    • British Columbia
      • Vancouver Mining Division
        • Brandywine Creek
          • Van Silver Property (Van Silver Mine; Van Silver Claims)
    [
    • Québec
      • Mauricie
        • Mékinac RCM
    Mineral. Deposita 42 (2007) 627-637.
    China
     
    • Guangxi Zhuang Autonomous Region
      • Nanning Prefecture
        • Long'an Co.
    Hongzhong Xu, Jinchu Zhu, Wenlan Zhang, and Jianping Zhou (1997): Acta Mineralogica Sinica 17(3), 345-351
    Czech Republic
     
    • Bohemia (Böhmen; Boehmen)
      • Central Bohemia Region
        • Příbram
          • Březové Hory ore region (Birkenberg)
            • Bohutín
              • Bohutín deposit
    Litochleb, J., Sejkora, J., Litochlebová, E., Jindra, J.: Semseyit a fizélyit z polymetalického ložiska Bohutín u Příbrami, Česká republika. Bulletin mineralogicko-petrografického oddělení Národního muzea v Praze, 2008, vol. 16, 1, 11-16.
          • Třebsko
    Anthony, Bideaux, Bladh, Nichols: "Handbook of Mineralogy", Vol. 1, 1990
    France
     
    • Auvergne
      • Haute-Loire
        • Langeac
          • Marsanges
    P.G. Pélisson : "Etude Minéralogique et Métallogénique du District Filonien Polytype de Paulhaguet (Haute-Loire, Massif Central Français)", Doctorate Thesis, Orléans, France, 1989
        • Paulhaguet
          • Mazerat-Aurouze
            • Aurouze
    P.G. Pélisson : "Etude Minéralogique et Métallogénique du District Filonien Polytype de Paulhaguet (Haute-Loire, Massif Central Français)", Doctorate Thesis, Orléans, France, 1989
    • Brittany
      • Morbihan
        • Pontivy
    Y. Moëlo, E. Makovicky and S. Karup-Moller : "Sulfures complexes plombo-argentifères : minéralogie et cristallochimie de la série andorite-fizelyite", Documents du BRGM N° 167, 1989.
    • Languedoc-Roussillon
      • Hérault
    Anthony, Bideaux, Bladh, Nichols: "Handbook of Mineralogy", Vol. 1, 1990
    • Limousin
      • Corrèze
        • Ussel
    [MinRec 1982, 5, p.261-268]
    • Pays de Loire
      • Vendée
        • Les Herbiers
    Y. Moëlo, E. Makovicky and S. Karup-Moller : "Sulfures complexes plombo-argentifères : minéralogie et cristallochimie de la série andorite-fizelyite", Documents du BRGM N° 167, 1989.
    • Provence-Alpes-Côte d'Azur
      • Hautes-Alpes
        • Orpierre
    Le Cahier des Micromonteurs,(2), 3-13
    Germany
     
    • Baden-Württemberg
      • Black Forest
        • Haslach
          • Welschbollenbach
    K. Walenta: "Die Mineralien des Schwarzwaldes", Weise (Munich), 1992
        • Hausach
          • Adlersbach valley
    No reference listed
    • Lower Saxony
      • Harz
        • St Andreasberg District
          • Beerberg
    No reference listed
    Hungary
     
    • Pest Co.
      • Börzsöny Mtns
        • Nagybörzsöny (Deutsch Pilsen; Deutschpilsen)
    Szakáll & Jánosi: Minerals of Hungary, 1995
    Italy
     
    • Piedmont
      • Torino Province
        • Canavese District
          • Borgofranco d'Ivrea
            • Biò
    Ambrino, P., Blass, G., Boscardin, M., Ciriotti, M.E., Dalla Fontana, G., Kolitsch, U., Martini, B., Milli, L., Salvetti, A., Bonacina, E. (2008). Borgofranco d'Ivrea. La paragenesi a solfuri e solfosali delle miniere argentifere. Rivista Mineralogica Italiana, 3/2008, 144-162
    Japan
     
    • Hokkaido
      • Shiribeshi Province
        • Shakotan peninsula
          • Furubira
    Forrest Cureton specimens; Handbook of Mineralogy
    Romania
     
    • Maramureș Co.
      • Baia Mare (Nagybánya)
        • Chiuzbaia (Kisbánya)
    Math. és Term.Tud.Ért. (1926) 42, 18-19; Palache et al (1944), Dana's System of Mineralogy, Seventh ed., Vol. 1: 450; Papp, Gábor, Alan J. Criddle, Chris J. Stanley, László Kriston and Géza Nagy (2007): Parajamesonite revisited: background of the discreditation of an enigmatic mineral species. Swiss Journal of Geosciences, 100, 495-502.
    Anthony, Bideaux, Bladh, Nichols: "Handbook of Mineralogy", Vol. 1, 1990; Mineralogical Record 7:139-140
    Szakall, Sandor (2002) Minerals of the Carpathians, p. 151
    1-Rădulescu Dan, Dimitrescu Radu, 1966, Mineralogia Topografică a României, Ed. Academiei RSR, 1966, p.322-323.
    Marias Francisc, 2005, Metallogeny of the Baia Mare Mining District-an approach based of the Cavnic hydrothermal system-comparison with other epithermal systems in the World. Ed. Cornelius, 2005, p. 376-377.
    Russia
     
    • Eastern-Siberian Region
      • Sakha Republic (Saha Republic; Yakutia)
        • Verkhoyansk Fold Belt
          • Verkhoyansk Silver Province
            • Deputatsky ore cluster
    Pavlova, G.G., and Borisenko, A.S. (2009): Ore Geology Reviews 35, 164-185.
    Pavlova, G.G., and Borisenko, A.S. (2009): Ore Geology Reviews 35, 164-185.
    Pavlova, G.G., and Borisenko, A.S. (2009): Ore Geology Reviews 35, 164-185.
    Pavlova, G.G., and Borisenko, A.S. (2009): Ore Geology Reviews 35, 164-185.
            • Southern Verkhoyansk District
    Pavlova, G.G., and Borisenko, A.S. (2009): Ore Geology Reviews 35, 164-185.
            • Western Verkhoyansk District
              • Mangazeisky ore cluster
    Pavlova, G.G., and Borisenko, A.S. (2009): Ore Geology Reviews 35, 164-185.
    Slovakia
     
    • Prešov Region
      • Prešov Co.
    Duda et. all.,1981:Minerály severnej časti Slanských vrchov. Min.Slovca,Monografia 2,Bratislava, 98 p
    Tajikistan
     
    • Viloyati Mukhtori Gorno-Badakhshan (Viloyati Badakhshoni Kuni)
      • Pamir Mts
        • Pamir Silver District
          • Bazardara ore cluster
    Pavlova, G.G., and Borisenko, A.S. (2009): Ore Geology Reviews 35, 164-185.
    USA
     
    • California
      • Orange Co.
        • Santa Ana Mts
          • Silverado
    Robert Housely
    • Colorado
      • Boulder Co.
        • Boulder Co. Tungsten District
    Minerals of Colorado (1997) Eckels, E. B.
        • Gold Hill District
          • Gold Hill
    Minerals of Colorado (1997) Eckels, E. B.
    Minerals of Colorado (1997) Eckels, E. B.
    Minerals of Colorado (1997) Eckels, E. B.
        • Jamestown District
    Minerals of Colorado (1997) Eckels, E. B.
        • Ward District
    Minerals of Colorado (1997) Eckels, E. B.
    Minerals of Colorado (1997) Eckels, E. B.
      • Clear Creek Co.
        • Georgetown District
    Minerals of Colorado (1997) Eckels, E. B.
      • Summit Co.
    Minerals of Colorado (1997) Eckel, E. B.
    • Nevada
      • Clark Co.
        • Goodsprings District
    NBMG Spec. Pub. 31 Minerals of Nevada
      • Nye Co.
        • Morey District
    NBMG Spec. Pub. 31 Minerals of Nevada
    Rocks and Minerals, (1999) 74:405-414
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