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Kentrolite

Big Photo

Big Chief Mine ("Kentrolite locality"), Percha Creek, Hillsboro, Hillsboro District, Sierra Co., New Mexico, USA
© FL Murray

Show Kentrolite Photos (16)
Formula:
Pb
 
2
Mn
3+
2
[O
 
2
|Si
 
2
O
 
7
]
System:OrthorhombicColour:Black, sometimes with ...
Hardness:5
Name:Named in 1880 by Alexis Damour and Gerhard von Rath from the Greek for thorn or spike for it's habit.


Kentrolite-Melanotekite Series.

A synthetic aluminium analogue is known.

Classification of Kentrolite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:8/C.20-20
Nickel-Strunz 10th (pending) edition ID:9.BE.80

9 : SILICATES (Germanates)
B : Sorosilicates
E : Si2O7 groups, with additional anions; cations in octahedral [6] and greater coordination
Dana 8th edition ID:56.2.10.2

56 : SOROSILICATES Si2O7 Groups, With Additional O, OH, F and H2O
2 : Si2O7 Groups and O, OH, F, and H2O with cations in [4] and/or >[4] coordination
Hey's CIM Ref.:14.13.7

14 : Silicates not Containing Aluminum
13 : Silicates of Pb
mindat.org URL:http://www.mindat.org/min-2185.html
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Type Occurrence of Kentrolite

Type Locality:Långban, Filipstad, Värmland, Sweden
Year of Discovery:1880

Occurrences of Kentrolite

Geological Setting:Oxide zinc deposits.

Physical Properties of Kentrolite

Lustre:Sub-Adamantine, Resinous, Greasy
Diaphaneity (Transparency):Translucent
Colour:Black, sometimes with dark red internal reflections
Streak:Brown to yellowish brown
Hardness (Mohs):5
Hardness Data:Measured
Tenacity:Brittle
Cleavage:Distinct/Good
{110}
Fracture:Irregular/Uneven
Density (measured):6.26 g/cm3
Density (calculated):6.29 g/cm3

Crystallography of Kentrolite

Crystal System:Orthorhombic
Class (H-M):mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:Pbcm {P2/b 21/c 21/m}
Cell Parameters:a = 6.961Å, b = 11.018Å, c = 9.964Å
Ratio:a:b:c = 0.632 : 1 : 0.904
Unit Cell Volume:V 764.20 ų (Calculated from Unit Cell)
Morphology:Prismatic to equant. Isolated crystals or rosettes, sheaflike groups, massive.
X-Ray Powder Diffraction:
d-spacingIntensity
5.56 (60)
3.71 (80)
3.51 (80)
3.24 (80)
2.96 (50)
2.90 (100)
2.86 (100)
Comments:20-586 (natural)

Optical Data of Kentrolite

Type:Biaxial (+)
RI values: nα = 2.100 nβ = 2.200 nγ = 2.310
2V:Measured: 88° , Calculated: 88°
Birefringence:0.21
Maximum Birefringence:δ = 0.210

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Very High
Dispersion:strong r < v
Optical Extinction:Parallel
Pleochroism:Strong
Comments:X= bright yellowish pink
Y= reddish brown
Z= deep brownish red

Chemical Properties of Kentrolite

Formula:
Pb
 
2
Mn
3+
2
[O
 
2
|Si
 
2
O
 
7
]
Essential elements:Mn, O, Pb, Si
All elements listed in formula:Mn, O, Pb, Si
Common Impurities:Ti,Al,Fe,Zn,Mg

Relationship of Kentrolite to other Species

Series:Forms a series with Melanotekite (see here)
Related Minerals - Nickel-Strunz Grouping):

- +
9.BE.02Wadsleyite
(Mg,Fe
2+
 
)
 
2
[SiO
 
4
]
9.BE.05Hennomartinite
SrMn
3+
2
[(OH)
 
2
|Si
 
2
O
 
7
] · H
 
2
O
9.BE.05Lawsonite
CaAl
 
2
[(OH)
 
2
|Si
 
2
O
 
7
] · H
 
2
O
9.BE.05Noelbensonite
BaMn
3+
2
[(OH)
 
2
|Si
 
2
O
 
7
] · H
 
2
O
9.BE.05Itoigawaite
SrAl
 
2
[(OH)
 
2
|Si
 
2
O
 
7
] · H
 
2
O
9.BE.07Ilvaite
CaFe
2+
2
Fe
3+
 
[O|OH|Si
 
2
O
 
7
]
9.BE.07Manganilvaite
Ca(Mn
2+
 
,Fe
2+
 
)
 
2
Fe
3+
 
[O|OH|Si
 
2
O
 
7
]
9.BE.10Suolunite
Ca
 
2
[H
 
2
Si
 
2
O
 
7
] · H
 
2
O
9.BE.12Jaffeite
Ca
 
6
[(OH)
 
6
|Si
 
2
O
 
7
]
9.BE.15Fresnoite
Ba
 
2
Ti[O|Si
 
2
O
 
7
]
9.BE.17Baghdadite
Ca
 
3
(Zr,Ti)[O
 
2
|Si
 
2
O
 
7
]
9.BE.17Burpalite
Na
 
2
CaZr[F
 
2
|Si
 
2
O
 
7
]
9.BE.17Cuspidine
Ca
 
4
[(F,OH)
 
2
|Si
 
2
O
 
7
]
9.BE.17Hiortdahlite
(Ca,Na)
 
3
(Zr,Ti)Si
 
2
O
 
7
(O,OH,F)
 
2
9.BE.17Janhaugite
(Na,Ca)
 
3
(Mn,Fe)
 
3
(Ti,Zr,Nb)
 
2
Si
 
4
O
 
15
(OH,F,O)
 
3
9.BE.17Låvenite
(Na,Ca)
 
2
(Mn
2+
 
,Fe
2+
 
)(Zr,Ti)[(O,OH,F)
 
2
|Si
 
2
O
 
7
]
9.BE.17Niocalite
(Ca,Nb)
 
4
[(O,OH,F)
 
2
|Si
 
2
O
 
7
]
9.BE.17Normandite
NaCa(Mn,Fe)(Ti,Nb,Zr)[(O,F)
 
2
|Si
 
2
O
 
7
]
9.BE.17Wöhlerite
NaCa
 
2
(Zr,Nb)[(O,OH,F)
 
2
|Si
 
2
O
 
7
]
9.BE.17Hiortdahlite I
(Na
 
3
Ca)Ca
 
8
Zr
 
2
(M
3+
 
)
 
2
(Si
 
2
O
 
7
)
 
4
O
 
3
F
 
5
9.BE.17Marianoite
Na
 
2
Ca
 
4
(Nb,Zr)
 
2
[(O,F)
 
2
|Si
 
2
O
 
7
]
 
2
9.BE.20Mosandrite
Na
 
2
Ca
 
4
(Ce,La,Nd)Ti(Si
 
2
O
 
7
)
 
2
OF
 
3
9.BE.20Nacareniobsite-(Ce)
Na
 
3
Ca
 
3
(Ce,La,Nd)Nb[F
 
3
|O|(Si
 
2
O
 
7
)
 
2
]
9.BE.22Götzenite
Na
 
2
Ca
 
5
Ti[F
 
4
|(Si
 
2
O
 
7
)
 
2
]
9.BE.22Hainite
Na
 
4
Ca
 
8
(Ti,Zr,Mn)
 
3
[F
 
4
|(Si
 
2
O
 
7
)
 
2
]
 
2
9.BE.22Rosenbuschite
(Ca,Na)
 
3
(Zr,Ti)[O|F|Si
 
2
O
 
7
]
9.BE.22Kochite
(Na,Ca)
 
3
Ca
 
2
(Mn,Ca)ZrTi[(F,O)
 
4
|(Si
 
2
O
 
7
)
 
2
]
9.BE.23Dovyrenite
Ca
 
6
Zr(Si
 
2
O
 
7
)
 
2
(OH)
 
4
9.BE.25Barytolamprophyllite
(Ba,Na)
 
2
(Na,Ti,Fe
3+
 
)
 
4
Ti
 
2
[O|(OH,F)|Si
 
2
O
 
7
]
 
2
9.BE.25Ericssonite
BaMn
2+
2
Fe
3+
 
[O|OH|Si
 
2
O
 
7
]
9.BE.25Lamprophyllite
(Sr,K,Ba)
 
2
(Na,Ti,Mn
2+
 
,Fe
3+
 
)
 
4
Ti
 
2
[O|(O,OH,F)|Si
 
2
O
 
7
]
 
2
9.BE.25Orthoericssonite
BaMn
2+
2
Fe
3+
 
[O|OH|Si
 
2
O
 
7
]
9.BE.25Seidozerite
Na
 
8
Zr
 
3
Ti
 
3
Mn
2+
2
[O|F|Si
 
2
O
 
7
]
 
4
9.BE.25Nabalamprophyllite
Na
 
3
(Ba,Na)
 
2
Ti
 
3
[O|(OH,F)|Si
 
2
O
 
7
]
 
2
9.BE.25Grenmarite
(Zr,Mn)
 
2
(Zr,Ti)(Mn,Na)(Na,Ca)
 
4
(Si
 
2
O
 
7
)
 
2
(O,F)
 
4
9.BE.27Murmanite
Na
 
2
(Ti,Nb)
 
2
Si
 
2
O
 
9
·nH
 
2
O
9.BE.30Epistolite
Na
 
2
(Nb,Ti)
 
2
[O
 
2
|Si
 
2
O
 
7
] · nH
 
2
O
9.BE.32Lomonosovite
Na
 
5
Ti
 
2
[O
 
2
|PO
 
4
|Si
 
2
O
 
7
]
9.BE.35Vuonnemite
Na
 
11
Ti
4+
 
Nb
 
2
(Si
 
2
O
 
7
)
 
2
(PO
 
4
)
 
2
O
 
3
(F,OH)
9.BE.37Sobolevite
Na
 
12
Ca(NaCaMn)Ti
 
2
(Si
 
2
O
 
7
)
 
2
(PO
 
4
)
 
4
O
 
3
F
 
3
9.BE.40Innelite
Na
 
2
(Ba,K)
 
4
(Mg,Ca,Fe)Ti
 
3
Si
 
4
O
 
18
(OH,F)
 
1.5
SO
 
4
9.BE.40Phosphoinnelite
Ba
 
4
Na
 
3
Ti
 
3
[(O,F)
 
3
|(PO
 
4
,SO
 
4
)
 
2
|Si
 
4
O
 
14
]
9.BE.42Yoshimuraite
Ba
 
2
Mn
 
2
TiOSi
 
2
O
 
7
(PO
 
4
)(OH)
9.BE.45Quadruphite
Na
 
14
Ca
 
2
Ti
 
4
[O
 
2
|F|(PO
 
4
)
 
2
|Si
 
2
O
 
7
]
 
2
9.BE.47Polyphite
Na
 
5
(Na
 
4
Ca
 
2
)Ti
 
2
(Si
 
2
O
 
7
)(PO
 
4
)
 
3
O
 
2
F
 
2
9.BE.50Bornemanite
Na
 
6
[]BaTi
 
2
Nb(Si
 
2
O
 
7
)
 
2
(PO
 
4
)O
 
2
(OH)F
9.BE.50Shkatulkaite
Na
 
10
Mn
2+
 
Ti
 
3
Nb
 
3
[(OH)
 
2
|F|(Si
 
2
O
 
7
)
 
6
] · 12H
 
2
O
9.BE.55Bafertisite
Ba(Fe
3+
 
,Mn
2+
 
)
 
2
Ti[O|(O,OH)
 
2
|Si
 
2
O
 
7
]
9.BE.55Hejtmanite
Ba(Mn
2+
 
,Fe
2+
 
)
 
2
Ti[O|(OH,F)
 
2
|Si
 
2
O
 
7
]
9.BE.55Bykovaite
BaNa(Na,Ti)
 
4
[(OH,F)
 
2
|(Ti,Nb)
 
2
Si
 
4
O
 
14
(O,OH)
 
3
] · 3H
 
2
O
9.BE.55Nechelyustovite
(Ba,Na)
 
2
{(Na,Ti,Mn)
 
4
[(Ti,Nb)
 
2
(OH)
 
3
Si
 
4
O
 
14
](OH,O,F)
 
2
} · 3H
 
2
O
9.BE.60Delindeite
(Na,K)
 
2.7
(Ba,Ca)
 
4
(Ti,Fe,Al)
 
6
Si
 
8
O
 
26
(OH)
 
14
9.BE.65Bussenite
Na
 
2
Ba
 
2
FeTiSi
 
2
O
 
7
(CO
 
3
)(OH)
 
3
F
9.BE.67Jinshajiangite
BaNaTi
 
2
 Fe
2+
4
(Si
 
2
O
 
7
)
 
2
O
 
2
(OH)
 
2
F
9.BE.67Perraultite
BaNaTi
 
2
 Mn
2+
4
(Si
 
2
O
 
7
)
 
2
O
 
2
(OH)
 
2
F
9.BE.67Surkhobite
(Ba,K)
 
2
CaNaMn
 
8
Ti
 
4
(Si
 
2
O
 
7
)
 
4
O
 
4
(F,OH,O)
 
6
9.BE.70Karnasurtite-(Ce)
(Ce,La,Th)(Ti,Nb)(Al,Fe)(Si,P)
 
2
O
 
7
(OH)
 
4
·3H
 
2
O
9.BE.70Perrierite-(Ce)
Ce
 
4
MgFe
3+
2
Ti
4+
2
O
 
8
(Si
 
2
O
 
7
)
 
2
9.BE.70Strontiochevkinite
(Sr,La,Ce,Ca)
 
4
Fe
3+
 
(Ti,Zr)
 
2
Ti
 
2
[O
 
4
|Si
 
2
O
 
7
]
 
2
9.BE.70Chevkinite-(Ce)
(Ce,La,Ca,Th)
 
4
(Fe
2+
 
,Mg)(Fe
2+
 
,Ti,Fe
3+
 
)
 
2
(Ti,Fe
3+
 
)
 
2
[O
 
4
|Si
 
2
O
 
7
]
 
2
9.BE.70Polyakovite-(Ce)
(Ce,Ca)
 
4
(Mg,Fe
2+
 
)(Cr
3+
 
,Fe
3+
 
)
 
2
(Ti,Nb)
 
2
[O
 
4
|Si
 
2
O
 
7
]
 
2
9.BE.70Rengeite
Sr
 
4
ZrTi
 
4
[O
 
4
|Si
 
2
O
 
7
]
 
2
9.BE.70Matsubaraite
Sr
 
4
Ti
 
5
[O
 
4
|Si
 
2
O
 
7
]
 
2
9.BE.70Dingdaohengite-(Ce)
Ce
 
4
Fe
2+
 
(Ti,Fe
2+
 
,Mg)
 
2
Ti
 
2
[O
 
4
|Si
 
2
O
 
7
]
 
2
9.BE.70Maoniupingite-(Ce)
(REE,Ca)
 
4
(Fe
3+
 
,Ti,Fe
2+
 
,[])(Ti,Fe
3+
 
,Fe
2+
 
,Nb)
 
4
[O
 
4
|Si
 
2
O
 
7
]
 
2
9.BE.70Perrierite-(La)
(La,Ce, Ca)
 
4
(Fe,Mn
2+
 
,Mg)(Ti,Fe)
 
4
[O
 
4
|Si
 
2
O
 
7
]
 
2
9.BE.70UKI-2008-(SiO:SrTiZr)
Sr
 
4
ZrTi
 
4
[O
 
4
|Si
 
2
O
 
7
]
 
2
9.BE.72Fersmanite
(Ca,Na)
 
4
(Ti,Nb)
 
2
Si
 
2
O
 
11
(F,OH)
 
2
9.BE.75Belkovite
Ba
 
3
(Nb,Ti)
 
6
[O
 
6
|Si
 
2
O
 
7
]
 
2
9.BE.77Nasonite
Pb
 
6
Ca
 
4
[Cl
 
2
|(Si
 
2
O
 
7
)
 
3
]
9.BE.80Melanotekite
Pb
 
2
Fe
3+
2
[O
 
2
|Si
 
2
O
 
7
]
9.BE.82Tilleyite
Ca
 
5
[(CO
 
3
)
 
2
|Si
 
2
O
 
7
]
9.BE.85Killalaite
Ca
 
3
[Si
 
2
O
 
7
] · 0.5H
 
2
O
9.BE.87Stavelotite-(La)
(La,Nd,Ca)
 
3
Mn
2+
3
Cu(Mn
3+
 
,Fe
3+
 
,Mn
4+
 
)
 
26
[O
 
5
|Si
 
2
O
 
7
]
 
6
9.BE.90Biraite-(Ce)
Ce
 
2
Fe
2+
 
[CO
 
3
|Si
 
2
O
 
7
]
9.BE.92Cervandonite-(Ce)
(Ce,Nd,La)(Fe
3+
 
,Fe
2+
 
,Ti,Al)
 
3
O
 
2
(Si
 
2
O
 
7
)(As
3+
 
O
 
3
)(OH)
9.BE.95Batisivite
V
 
8
Ti
 
6
[Ba(Si
 
2
O
 
7
)O
 
22
]
Related Minerals - Hey's Index Grouping:

- +
14.13.1Alamosite
Pb
 
12
[Si
 
12
O
 
36
]
14.13.2Plumbotsumite
Pb
 
5
Si
 
4
O
 
8
(OH)
 
10
14.13.3Luddenite
Cu
 
2
Pb
 
2
Si
 
5
O
 
14
·4H
 
2
O
14.13.4Molybdophyllite
Pb
 
2
Mg
 
2
[(OH)
 
2
|Si
 
2
O
 
7
]
14.13.5Margarosanite
Pb(Ca,Mn
2+
 
)
 
2
[Si
 
3
O
 
9
]
14.13.6Ganomalite
Pb
 
9
Ca
 
5
Mn[O|SiO
 
4
|(Si
 
2
O
 
7
)
 
4
]
14.13.8Barysilite
Pb
 
8
Mn
2+
 
[Si
 
2
O
 
7
]
 
3
14.13.9Melanotekite
Pb
 
2
Fe
3+
2
[O
 
2
|Si
 
2
O
 
7
]
14.13.10Creaseyite
Cu
 
2
Pb
 
2
(Fe,Al)
 
2
Si
 
5
O
 
17
·6H
 
2
O

Other Names for Kentrolite

Other Languages:
German:Kentrolit
Russian:Кентролит
Spanish:Kentrolita

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 Kentrolite

Reference List:American Mineralogist (1967): 52: 1085-1093.

American Mineralogist (1991): 76: 1389-1399.

Mineralogical Magazine (1994): 58: 172.

Dörsam, G., A. Liebscher, B. Wunder, and G. Franz (2008): Crystal structures of synthetic melanotekite (Pb2Fe2Si2O9), kentrolite (Pb2Mn2Si2O9), and the aluminum analogue (Pb2Al2Si2O9). American Mineralogist: 93: 573-583.

Internet Links for Kentrolite

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  • Look for Kentrolite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Kentrolite in the Natural History Museum (London) online catalogue
  • Kentrolite details from Handbook of Mineralogy (PDF)
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    Localities for Kentrolite

    Hide Locality List
    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.
    France
     
    • Midi-Pyrénées
      • Tarn
        • Réalmont
          • Peyrebrune
    		Jordi Fabre specimens (more info available on fabreminerals.com forum); www.mineral-forum.com/message-board/viewtopic.php?t=560
    Italy
     
    • Sardinia
      • Sassari Province
        • Ozieri
    		Olmi F.,Sabelli C.,Santucci A.,Brizzi G.- I silicati e i vanadati di Ozieri (SS)-Rivista Mineralogica Italiana 2/1995,pp145-160
    Kazakhstan
     
    • Atasu - Karazhal - Zhayrem area
    		Frank Dzubeck
    Frank Dzubeck
    Frank Dzubeck
    Namibia
     
    • Otjozondjupa Region
      • Grootfontein District
        • Kombat
    		Mineralogical Record: 22: 421.
    Norway
     
    • Oppland
      • Lunner
        • Grua Mining District
    		Harald Folvik (2005): Mineralene på Skjerpemyr. STEIN 32 (1), 4-9 (in norwegian)
    South Africa
     
    • Northern Cape Province
      • Kalahari manganese fields
        • Hotazel
    		[Von Bezing, K. L. et al. (1991) - The Kalahari manganese field : an update, Mineralogical Record, 22 (3), 279-302]
    Sweden
     
    • Dalarna
      • Avesta
        • Folkärna
    • Värmland
      • Filipstad
    		Damour & vom Rath (1880); AM:52(1967):1085; Nysten, P., Holtstam, D. and Jonsson, E. (1999) The Långban minerals. In Långban - The mines,their minerals, geology and explorers (D. Holtstam and J. Langhof, eds.), Swedish Museum of Natural History and Raster Förlag, Stockholm & Chr. Weise Verlag, Munich, pp. 89-183.
    Kjell Gatedal
        • Pajsberg
    		No reference listed
    • Västmanland
      • Lindesberg
    No reference listed
    No reference listed
      • Norberg
    UK
     
    • England
      • Somerset
        • Cranmore
    		Turner, R. (2006): A mechanism for the formation of the mineralized Mn deposits at Merehead Quarry, Cranmore, Somerset, England. Mineralogical Magazine 70, 629-653; Turner R.W. and Rumsey, M.S. (2007) Merehead Mineralogy - an Update. Russell Soc Newsletter, No 50, pp 17-18 (March 2007); Turner, R.W., (2006) A Mechanism for the formation of the Mineralised Mn Deposits at Merehead Quarry, Cranmore, Somerset, England. Min. Mag. vol. 70, no. 6, pp 629 - 653;
        • Holwell
    		BMS Database
        • Priddy
    		[MinRec 27:253]
    USA
     
    • Arizona
      • Pinal Co.
        • Mineral Mountain District
          • Superior area
            • Reymert Canyon
    		Collected by, and analyzed thru John Ebner, Wall Twp., NJ. J. Ebner & C. Lemanski, Jr. collections.
    • New Jersey
      • Sussex Co.
        • Franklin Mining District
          • Franklin
    		Cianciulli, J.: The Picking Table:32(2):15-16 (1991); Palache(1935):103; Dunn(1995):Pt3:415.
    • New Mexico
      • Sierra Co.
        • Hillsboro District
          • Hillsboro
            • Percha Creek
    		NMBMMR New Mexico Mineral symposium (2001) pp. 4-5
    Min Rec 20:1 p59
    Mineral and/or Locality
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