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Cianciulliite

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John Cianciulli
Formula:
Mn(Mg,Mn)2Zn2(OH)10 · 2-4H2O
Colour:
Dark reddish-brown nearly black
Lustre:
Sub-Adamantine, Vitreous, Pearly, Dull
Hardness:
1 - 2
Specific Gravity:
2.87 (Calculated)
Crystal System:
Monoclinic
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.


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Classification of CianciulliiteHide

Approved
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
6.2.13.1

6 : HYDROXIDES AND OXIDES CONTAINING HYDROXYL
2 : X(OH)2
7.18.13

7 : Oxides and Hydroxides
18 : Oxides of Mn

Physical Properties of CianciulliiteHide

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

Optical Data of CianciulliiteHide

Type:
Biaxial
RI values:
nα = 1.760 nγ = 1.920
Birefringence:
0.126
Max Birefringence:
δ = 0.160
Image 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%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 400%.
Internal Reflections:
red-orange

Chemical Properties of CianciulliiteHide

Formula:
Mn(Mg,Mn)2Zn2(OH)10 · 2-4H2O
IMA Formula:
Mg2Mn2+Zn2(OH)10 · 2-4H2O

Crystallography of CianciulliiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Setting:
C2/m
Cell Parameters:
a = 15.405 Å, b = 6.344 Å, c = 5.562 Å
β = 101.23°
Ratio:
a:b:c = 2.428 : 1 : 0.877
Unit Cell 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 DiffractionHide

Powder Diffraction Data:
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

Type Occurrence of CianciulliiteHide

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.
Geological Setting of Type Material:
Fracture fillings in zinc-silicate and oxide carbonate-hosted deposit
Associated Minerals at Type Locality:

Synonyms of CianciulliiteHide

Other Language Names for CianciulliiteHide

Related Minerals - Nickel-Strunz GroupingHide

4.FL.TrébeurdeniteFe2+2Fe3+4O2(OH)10CO3·3H2OTrig. 3m (3 2/m) : R3m
4.FL.05WoodalliteMg6Cr2(OH)16Cl2 · 4H2OTrig.
4.FL.05IowaiteMg6Fe3+2(OH)16Cl2 · 4H2OTrig. 3m (3 2/m) : R3m
4.FL.05JamboriteNi2+1-xCo3+x(OH)2-x(SO4)x · nH2OTrig. 3m (3 2/m) : R3m
4.FL.05MeixneriteMg6Al2(OH)16(OH)2 · 4H2OTrig. 3m (3 2/m) : R3m
4.FL.05MuskoxiteMg7Fe4O13 · 10H2OTrig. 3m (3 2/m)
4.FL.05FougèriteFe2+4Fe3+2(OH)12[CO3]·3H2OTrig. 3m (3 2/m) : R3m
4.FL.10HydrocalumiteCa4Al2(OH)12(Cl,CO3,OH)2 · 4H2OMon. 2 : P21
4.FL.15KuzeliteCa4Al2(OH)12[SO4] · 6H2OTrig.
4.FL.20Aurorite(Mn2+,Ag,Ca)Mn4+3O7 · 3H2OTrig. 3 : R3
4.FL.20Chalcophanite(Zn,Fe,Mn)Mn3O7 · 3H2OTrig. 3 : R3
4.FL.20ErnienickeliteNiMn3O7 · 3H2OTrig. 3 : R3
4.FL.20Jianshuiite(Mg,Mn,Ca)Mn3O7 · 3H2OTrig. 3 : R3
4.FL.25WoodruffiteZn2+x/2(Mn4+1-xMn3+x)O2·yH2OMon. 2/m : B2/m
4.FL.30Asbolane(Ni,Co)2-xMn4+(O,OH)4 · nH2OHex.
4.FL.35BuseriteNa4Mn14O27 · 21H2O
4.FL.40Ranciéite(Ca,Mn2+)0.2(Mn4+,Mn3+)O2 · 0.6H2OTrig. 3 : P3
4.FL.40Takanelite(Mn,Ca)Mn4O9 · H2OHex.
4.FL.45Birnessite(Na,Ca)0.5(Mn4+,Mn3+)2O4 · 1.5H2OMon. 2/m : B2/m
4.FL.60JenseniteCu3[TeO6] · 2H2OMon. 2/m : P21/m
4.FL.65LeisingiteCuMg2Te6+O6 · 6H2OTrig. 3 : P3
4.FL.70Akdalaite5Al2O3 · H2OHex.
4.FL.75CafetiteCaTi2O5 · H2OMon. 2/m : P21/b
4.FL.80MouriteUMo5O12(OH)10Mon.
4.FL.85DeloryiteCu4(UO2)(MoO4)2(OH)6Mon.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

7.18.1ManganositeMnOIso. m3m (4/m 3 2/m) : Fm3m
7.18.2HausmanniteMn2+Mn3+2O4Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
7.18.3PyrolusiteMn4+O2Tet. 4/mmm (4/m 2/m 2/m) : P42/mnm
7.18.4RamsdelliteMn4+O2Orth. mmm (2/m 2/m 2/m)
7.18.5Akhtenskiteε-Mn4+O2Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc
7.18.6FeitknechtiteMn3+O(OH)Trig. 3m (3 2/m) : P3m1
7.18.7ManganiteMn3+O(OH)Mon. 2/m : P21/b
7.18.8GroutiteMn3+O(OH)Orth. mmm (2/m 2/m 2/m) : Pnma
7.18.9Nsutite(Mn4+,Mn2+)(O,OH)2Hex.
7.18.10PyrochroiteMn(OH)2Trig. 3m (3 2/m)
7.18.11Birnessite(Na,Ca)0.5(Mn4+,Mn3+)2O4 · 1.5H2OMon. 2/m : B2/m
7.18.12Aurorite(Mn2+,Ag,Ca)Mn4+3O7 · 3H2OTrig. 3 : R3

Fluorescence of CianciulliiteHide

Not fluorescent in UV

Other InformationHide

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 CianciulliiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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 CianciulliiteHide

Localities for CianciulliiteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
USA (TL)
 
  • New Jersey
    • Sussex Co.
      • Franklin mining district
        • Franklin
Dunn, et al: AM. Min.:76:1708-1710 (1991); Dunn(1995):Pt4:588-589.
Mineral and/or Locality  
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