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Cianciulliite

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Formula:
Mn(Mg,Mn)
 
2
Zn
 
2
(OH)
 
10
 · 2-4H
 
2
O
System:MonoclinicColour:Dark reddish-brown
Hardness:2
Name:Named after Mr. John Cianciulli of Sussex, NJ, Youth Vocational Counselor, lifelong mineral collector and amateur mineralogist, and former Treasurer of the Franklin-Ogdensburg Mineralogical Society. He made significant long term contributions to the study of Franklin minerals and served as the second Curator of the Franklin Mineral Museum until his passing (1949-2005).


An extremely rare mineral.

Note: Fakes have been sold (see http://www.mindat.org/mesg-6-66563.html). Flakes of dark brown mica in pill capsules have been fraudulently sold as Cianciulliite.

Classification of Cianciulliite

IMA status:Approved
Strunz 8th edition ID:4/F.11-25
Nickel-Strunz 10th (pending) edition ID:4.FL.55

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
F : Hydroxides (without V or U)
L : Hydroxides with H2O +- (OH); sheets of edge-sharing octahedra
Dana 8th edition ID:6.2.13.1

6 : HYDROXIDES AND OXIDES CONTAINING HYDROXYL
2 : X(OH)2
Hey's CIM Ref.:7.18.13

7 : Oxides and Hydroxides
18 : Oxides of Mn
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Type Occurrence of Cianciulliite

Type Locality:Franklin Mine, Franklin, Franklin Mining District, Sussex Co., New Jersey, USA
Year of Discovery:1991

Physical Properties of Cianciulliite

Colour:Dark reddish-brown
Hardness (Mohs):2

Crystallography of Cianciulliite

Crystal System:Monoclinic
Cell Parameters:a = 15.47Å, b = 6.36Å, c = 5.57Å
β = 101.29°
Ratio:a:b:c = 2.432 : 1 : 0.876
Unit Cell Volume:V 537.42 ų (Calculated from Unit Cell)

Optical Data of Cianciulliite

Type:Biaxial
RI values: nα = 1.760 nγ = 1.920
Maximum Birefringence:δ = 0.160

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:r > v

Chemical Properties of Cianciulliite

Formula:
Mn(Mg,Mn)
 
2
Zn
 
2
(OH)
 
10
 · 2-4H
 
2
O
Essential elements:H, Mg, Mn, O, Zn
All elements listed in formula:H, Mg, Mn, O, Zn

Relationship of Cianciulliite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
4.FL.05Woodallite
Mg
 
6
Cr
 
2
(OH)
 
16
Cl
 
2
 · 4H
 
2
O
4.FL.05Iowaite
Mg
 
6
Fe
3+
2
(OH)
 
16
Cl
 
2
 · 4H
 
2
O
4.FL.05Jamborite
(Ni
2+
 
,Ni
3+
 
,Co,Fe)(OH)
 
2
(OH,S,H
 
2
O)
4.FL.05Meixnerite
Mg
 
6
Al
 
2
(OH)
 
18
 · 4H
 
2
O
4.FL.05Muskoxite
Mg
 
7
Fe
 
4
O
 
13
 · 10H
 
2
O
4.FL.05Fougèrite
(Fe
2+
 
,Mg)
 
6
Fe
3+
2
(OH)
 
18
 · 4H
 
2
O
4.FL.10Hydrocalumite
Ca
 
2
Al(OH)
 
7
 · 2H
 
2
O
4.FL.15Kuzelite
Ca
 
4
Al
 
2.4
(OH)
 
12.8
(SO
 
4
) · 6H
 
2
O
4.FL.20Aurorite
(Mn
2+
 
,Ag,Ca)Mn
4+
3
O
 
7
 · 3H
 
2
O
4.FL.20Chalcophanite
(Zn,Fe,Mn)Mn
 
3
O
 
7
 · 3H
 
2
O
4.FL.20Ernienickelite
NiMn
 
3
O
 
7
 · 3H
 
2
O
4.FL.20Jianshuiite
(Mg,Mn)Mn
 
3
O
 
7
 · 3H
 
2
O
4.FL.25Woodruffite
Zn(Mn
4+
 
,Mn
3+
 
)
 
5
O
 
10
·3½H
 
2
O
4.FL.30Asbolane
(Ni,Co)
 
2-x
Mn
4+
 
(O,OH)
 
4
 · nH
 
2
O
4.FL.35Buserite
Na
 
4
Mn
 
14
O
 
27
 · 21H
 
2
O
4.FL.40Ranciéite
(Ca,Mn)Mn
 
4
O
 
9
 · 3H
 
2
O
4.FL.40Takanelite
(Mn,Ca)Mn
 
4
O
 
9
 · H
 
2
O
4.FL.45Birnessite
(Na,Ca)
 
0.5
(Mn
4+
 
,Mn
3+
 
)
 
2
O
 
4
 · 1.5H
 
2
O
4.FL.60Jensenite
Cu
 
3
[TeO
 
6
] · 2H
 
2
O
4.FL.65Leisingite
Cu(Mg,Cu,Fe,Zn)
 
2
[TeO
 
6
] · 6H
 
2
O
4.FL.70Akdalaite
4Al
 
2
O
 
3
 · H
 
2
O
4.FL.75Cafetite
(Ca,Mg)(Fe,Al)
 
2
Ti
 
4
O
 
12
 · 4H
 
2
O
4.FL.80Mourite
UMo
 
5
O
 
12
(OH)
 
10
4.FL.85Deloryite
Cu
 
4
(UO
 
2
)(MoO
 
4
)
 
2
(OH)
 
6
Related Minerals - Hey's Index Grouping:

- +
7.18.1Manganosite
MnO
7.18.2Hausmannite
MnMn
 
2
O
 
4
7.18.3Pyrolusite
MnO
 
2
7.18.4Ramsdellite
Mn
4+
 
O
 
2
7.18.5Akhtenskite
ε-Mn
4+
 
O
 
2
7.18.6Feitknechtite
Mn
3+
 
O(OH)
7.18.7Manganite
Mn
3+
 
O(OH)
7.18.8Groutite
Mn
3+
 
O(OH)
7.18.9Nsutite
(Mn
4+
 
,Mn
2+
 
)(O,OH)
 
2
7.18.10Pyrochroite
Mn(OH)
 
2
7.18.11Birnessite
(Na,Ca)
 
0.5
(Mn
4+
 
,Mn
3+
 
)
 
2
O
 
4
 · 1.5H
 
2
O
7.18.12Aurorite
(Mn
2+
 
,Ag,Ca)Mn
4+
3
O
 
7
 · 3H
 
2
O

Other Names for Cianciulliite

Synonyms:
IMA1990-042
Other Languages:
German:Cianciulliit
Russian:Сиансиуллиит
Spanish:Cianciulliita

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 Cianciulliite

Reference List:

- +
American Mineralogist (1991): 76: 1708-1710, 1711-1714.

Internet Links for Cianciulliite

Search Engines:
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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Cianciulliite details from Handbook of Mineralogy (PDF)
    • Mineral Dealers:
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    • Localities for Cianciulliite

    Hide Locality List
    (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.
    USA
     
    • New Jersey
      • Sussex Co.
        • Franklin Mining District
          • Franklin
    		Dunn, et al: AM. Min.:76:1708-1710 (1991); Dunn(1995):Pt4:588-589.
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