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Cianciulliite

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John Cianciulli
Formula:
Mn(Mg,Mn)2Zn2(OH)10 · 2-4H2O
System:
Monoclinic
Colour:
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

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
mindat.org URL:
http://www.mindat.org/min-1051.html
Please feel free to link to this page.

First Recorded Occurrence of Cianciulliite

General Appearance of First Recorded 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 First Recorded Material:
Fracture fillings in zinc-silicate and oxide carbonate-hosted deposit
Associated Minerals at First Recorded Locality:

Physical Properties of Cianciulliite

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:
2.87 g/cm3 (Calculated)

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 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

Optical Data of Cianciulliite

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 Cianciulliite

Formula:
Mn(Mg,Mn)2Zn2(OH)10 · 2-4H2O
Essential elements:
All elements listed in formula:

Relationship of Cianciulliite to other Species

4.FL.TrébeurdeniteFe22+Fe43+O2(OH)10CO3·3H2O
4.FL.05WoodalliteMg6Cr2(OH)16Cl2 · 4H2O
4.FL.05IowaiteMg6Fe23+(OH)16Cl2 · 4H2O
4.FL.05Jamborite(Ni2+1-x,Cox3+(OH)2-x(SO4)x·nH2O [x ≤ ⅓; n ≤ (1 - x)]
4.FL.05MeixneriteMg6Al2(OH)16(OH)2 · 4H2O
4.FL.05MuskoxiteMg7Fe4O13 · 10H2O
4.FL.05FougèriteFe42+Fe23+(OH)12[CO3]·3H2O
4.FL.10HydrocalumiteCa4Al2(OH)12(Cl,CO3,OH)2 · 4H2O
4.FL.15KuzeliteCa4Al2(OH)12[SO4] · 6H2O
4.FL.20Aurorite(Mn2+,Ag,Ca)Mn34+O7 · 3H2O
4.FL.20Chalcophanite(Zn,Fe,Mn)Mn3O7 · 3H2O
4.FL.20ErnienickeliteNiMn3O7 · 3H2O
4.FL.20Jianshuiite(Mg,Mn)Mn3O7 · 3H2O
4.FL.25WoodruffiteZn(Mn4+,Mn3+)5O10·3½H2O
4.FL.30Asbolane(Ni,Co)2-xMn4+(O,OH)4 · nH2O
4.FL.35BuseriteNa4Mn14O27 · 21H2O
4.FL.40Ranciéite(Ca,Mn)Mn4O9 · 3H2O
4.FL.40Takanelite(Mn,Ca)Mn4O9 · H2O
4.FL.45Birnessite(Na,Ca)0.5(Mn4+,Mn3+)2O4 · 1.5H2O
4.FL.60JenseniteCu3[TeO6] · 2H2O
4.FL.65LeisingiteCu(Mg,Cu,Fe,Zn)2[TeO6] · 6H2O
4.FL.70Akdalaite4Al2O3 · H2O
4.FL.75Cafetite(Ca,Mg)(Fe,Al)2Ti4O12 · 4H2O
4.FL.80MouriteUMo5O12(OH)10
4.FL.85DeloryiteCu4(UO2)(MoO4)2(OH)6
7.18.1ManganositeMnO
7.18.2HausmanniteMn2+Mn23+O4
7.18.3PyrolusiteMnO2
7.18.4RamsdelliteMn4+O2
7.18.5Akhtenskiteε-Mn4+O2
7.18.6FeitknechtiteMn3+O(OH)
7.18.7ManganiteMn3+O(OH)
7.18.8GroutiteMn3+O(OH)
7.18.9Nsutite(Mn4+,Mn2+)(O,OH)2
7.18.10PyrochroiteMn(OH)2
7.18.11Birnessite(Na,Ca)0.5(Mn4+,Mn3+)2O4 · 1.5H2O
7.18.12Aurorite(Mn2+,Ag,Ca)Mn34+O7 · 3H2O

Other Names for Cianciulliite

Name in Other Languages:

Other Information

Not fluorescent in UV
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 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

Localities for Cianciulliite

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.
USA
 
  • 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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