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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:1 - 2
Name:
Named by Pete J. Dunn, Joel D. Grice, Alan J. Criddle, and Chris J. Stanley (1991) after Mr. John Cianciulli [January 18, 1949 New Jersey, USA - January 13, 2005 Wantage, Sussex County, New Jersey, USA]. He was the second Curator of the Franklin Mineral Museum, Youth Vocational Counselor, lifelong mineral collector, and former Treasurer of the Franklin-Ogdensburg Mineralogical Society.


Dark red-brown nearly black bright rectangular plates to 1 mm or less. 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. Cianciulliite does not resemble a mica in appearance.

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
mindat.org URL:http://www.mindat.org/min-1051.html
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Type Occurrence of Cianciulliite

Type Locality:Franklin Mine, Franklin, Franklin Mining District, Sussex Co., New Jersey, USA
General Appearance of Type Material:Found as one of the latest species with cahnite. The nearly black cianciulliite crystals have a poor color contrast with the manganese oxide association, but the luster should be bright.
Year of Discovery:1991
Geological Setting of type material:Fracture fillings in zinc-silicate and oxide carbonate-hosted deposit
Associated Minerals at type locality:
ZinciteWillemiteManganese OxidesCahnite

Physical Properties of Cianciulliite

Lustre:Sub-Adamantine, Vitreous, Pearly, Dull
Diaphaneity (Transparency):Opaque
Comment:Pearly cleavage
Colour:Dark reddish-brown nearly black
Hardness (Mohs):1 - 2
Comment:soft
Tenacity:Waxy
Cleavage:Perfect
{100}
Density (calculated):2.87 g/cm3

Crystallography of Cianciulliite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:B2/m
Space Group Setting:C2/m
Cell Parameters:a = 15.405Å, b = 6.344Å, c = 5.562Å
β = 101.23°
Ratio:a:b:c = 2.428 : 1 : 0.877
Unit Cell Volume:V 533.16 ų (Calculated from Unit Cell)
Z:2
Morphology:Ciainciulliite is dominantly pinacoidal and resembles a flat rectangular prism with large {100}.
X-Ray Powder Diffraction:
d-spacingIntensity
7.61 (100)
5.47 (20)
3.96 (50)
3.45 (30)
2.997 (40)
2.745 (60)
2.673 (30)
Comments:natural material

Optical Data of Cianciulliite

Type:Biaxial
RI values: nα = 1.760 nγ = 1.920
Birefringence:0.126
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
Type:Anisotropic
Anisotropism:Weak
Dispersion:r > v
Reflectivity:
9.52-9.72(420) 9.13-9.30(440) 8.85-8.97(460) 8.65-8.74(480) 8.44-8.56(500) 8.34-8.44(520) 8.23-8.35(540) 8.09-8.25(560) 8.06-8.21(580) 8.01-8.20(600) 7.98-8.18(620) 7.96-8.18(640) 7.98-8.18(660) 7.98-8.18(680) 7.93-8.15(700) 7.90-8.14nmR=400%


Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 400%.
Internal Reflections:red-orange

Chemical Properties of Cianciulliite

Formula:
Mn(Mg,Mn)
 
2
Zn
 
2
(OH)
 
10
· 2-4H
 
2
O
Simplified for copy/paste:Mn(Mg,Mn)2Zn2(OH)10·2-4H2O
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.Trébeurdenite
Fe
2+
2
Fe
3+
4
O
 
2
(OH)
 
10
CO
 
3
·3H
 
2
O
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+
1-x
,Co
3+
x
(OH)
 
2-x
(SO
 
4
)
 
x
·nH
 
2
O [x ≤ ⅓; n ≤ (1 - x)]
4.FL.05Meixnerite
Mg
 
6
Al
 
2
(OH)
 
16
(OH)
 
2
· 4H
 
2
O
4.FL.05Muskoxite
Mg
 
7
Fe
 
4
O
 
13
· 10H
 
2
O
4.FL.05Fougèrite
Fe
2+
4
Fe
3+
2
(OH)
 
12
[CO
 
3
]·3H
 
2
O
4.FL.10Hydrocalumite
Ca
 
4
Al
 
2
(OH)
 
12
(Cl,CO
 
3
,OH)
 
2
· 4H
 
2
O
4.FL.15Kuzelite
Ca
 
4
Al
 
2
(OH)
 
12
[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

Fluorescence in UV light:Not fluorescent in UV
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.
Dunn, Pete J. (1995) Cianciulliite, Franklin and Sterling Hill, New Jersey: The World's Most Magnificent Mineral Deposits,

Internet Links for Cianciulliite

Search Engines:
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  • External Links:
  • Look for Cianciulliite on Webmineral
  • Look for Cianciulliite on Athena Mineralogy
  • Look for Cianciulliite on Mineralien Atlas
  • 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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  • Fine Minerals from Weinrich Minerals, Inc.
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  • Search for Cianciulliite on Well-Arranged Molecules
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  • DAKOTA MATRIX offers Cabinet and Rare Species from Worldwide Localities.
  • Buy fine minerals and gemstones from Pala International
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  • Cianciulliite specimens for sale - minfind.com
  • Lapis Mineral Magazin
  • Localities for Cianciulliite

    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.
    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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