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Kentrolite

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Formula:
Pb2Mn3+2(Si2O7)O2
Colour:
Black, sometimes with dark red internal reflections
Lustre:
Sub-Adamantine, Resinous, Greasy
Hardness:
5
Specific Gravity:
6.26
Crystal System:
Orthorhombic
Name:
Named in 1880 by Alexis Damour and Gerhard von Rath from the Greek κεντρί for "thorn" or "spike", in allusion to its habit.
Kentrolite-Melanotekite Series.

A synthetic aluminium analogue is known.


Hide all sections | Show all sections

Classification of KentroliteHide

Approved, 'Grandfathered' (first described prior to 1959)
9.BE.80

9 : SILICATES (Germanates)
B : Sorosilicates
E : Si2O7 groups, with additional anions; cations in octahedral [6] and greater coordination
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
14.13.7

14 : Silicates not Containing Aluminum
13 : Silicates of Pb

Physical Properties of KentroliteHide

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

Optical Data of KentroliteHide

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

Formula:
Pb2Mn3+2(Si2O7)O2
IMA Formula:
Pb2Mn3+2O2(Si2O7)
Common Impurities:
Ti,Al,Fe,Zn,Mg

Crystallography of KentroliteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pbcm
Cell Parameters:
a = 6.961 Å, b = 11.018 Å, c = 9.964 Å
Ratio:
a:b:c = 0.632 : 1 : 0.904
Unit Cell V:
764.20 ų (Calculated from Unit Cell)
Morphology:
Prismatic to equant. Isolated crystals or rosettes, sheaflike groups, massive.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
5.56 (60)
3.71 (80)
3.51 (80)
3.24 (80)
2.96 (50)
2.90 (100)
2.86 (100)
2.74 (100)
Comments:
20-586 (natural)

Type Occurrence of KentroliteHide

Other Language Names for KentroliteHide

Relationship of Kentrolite to other SpeciesHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Rhodochrosite34 photos of Kentrolite associated with Rhodochrosite on mindat.org.
Arsenatian Vanadinite6 photos of Kentrolite associated with Arsenatian Vanadinite on mindat.org.
Vanadinite5 photos of Kentrolite associated with Vanadinite on mindat.org.
Axinite-(Mn)4 photos of Kentrolite associated with Axinite-(Mn) on mindat.org.
Calcite2 photos of Kentrolite associated with Calcite on mindat.org.
Braunite2 photos of Kentrolite associated with Braunite on mindat.org.
Aragonite2 photos of Kentrolite associated with Aragonite on mindat.org.
Baryte2 photos of Kentrolite associated with Baryte on mindat.org.
Cerussite1 photo of Kentrolite associated with Cerussite on mindat.org.
Willemite1 photo of Kentrolite associated with Willemite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.BE.02Wadsleyite(Mg,Fe2+)2(SiO4)Orth.
9.BE.05HennomartiniteSrMn3+2(Si2O7)(OH)2 · H2OOrth.
9.BE.05LawsoniteCaAl2(Si2O7)(OH)2 · H2OOrth. mmm (2/m 2/m 2/m) : Cmcm
9.BE.05NoelbensoniteBaMn3+2(Si2O7)(OH)2 · H2OOrth.
9.BE.05ItoigawaiteSrAl2(Si2O7)(OH)2 · H2OOrth.
9.BE.07IlvaiteCaFe3+Fe2+2(Si2O7)O(OH)Orth. mmm (2/m 2/m 2/m)
9.BE.07ManganilvaiteCaFe2+Fe3+Mn2+(Si2O7)O(OH)Mon. 2/m : P21/b
9.BE.10SuoluniteCa2(H2Si2O7) · H2OOrth.
9.BE.12JaffeiteCa6(Si2O7)(OH)6Trig. 3 : P3
9.BE.15FresnoiteBa2Ti(Si2O7)OTet.
9.BE.17BaghdaditeCa3(Zr,Ti)(Si2O7)O2Mon.
9.BE.17BurpaliteNa2CaZr(Si2O7)F2Mon.
9.BE.17CuspidineCa4(Si2O7)(F,OH)2Mon. 2/m : P21/b
9.BE.17Hiortdahlite(Na,Ca)2Ca4Zr(Mn,Ti,Fe)(Si2O7)2(F,O)4 Tric.
9.BE.17Janhaugite(Na,Ca)3(Mn2+,Fe2+)3(Ti,Zr,Nb)2(Si2O7)2O2(OH,F)2Mon. 2/m : P21/m
9.BE.17Låvenite(Na,Ca)2(Mn2+,Fe2+)(Zr,Ti)(Si2O7)(O,OH,F)2Mon. 2/m : P21/b
9.BE.17Niocalite(Ca,Nb)4(Si2O7)(O,OH,F)2Mon.
9.BE.17NormanditeNaCa(Mn,Fe)(Ti,Nb,Zr)(Si2O7)OFMon. 2/m : P21/b
9.BE.17WöhleriteNaCa2(Zr,Nb)(Si2O7)(O,OH,F)2Mon. 2 : P21
9.BE.17Hiortdahlite INa4Ca8Zr2(Nb,Mn,Ti,Fe,Mg,Al)2(Si2O7)4O3F5
9.BE.17MarianoiteNa2Ca4(Nb,Zr)2(Si2O7)2(O,F)4Mon. 2 : P21
9.BE.20Mosandrite-(Ce)(Ca3REE)[(H2O)2Ca0.50.5]Ti(Si2O7)2(OH)2(H2O)2Mon. 2/m : P21/b
9.BE.20Nacareniobsite-(Ce)NbNa3Ca3(Ce,REE )(Si2O7)2OF3Mon.
9.BE.22GötzeniteNaCa6Ti(Si2O7)2OF3Tric. 1 : P1
9.BE.22Hainite-(Y)Na2Ca4(Y,REE)Ti(Si2O7)2OF3Tric. 1 : P1
9.BE.22RosenbuschiteNa6Ca6Zr3Ti(Si2O7)4O2F6Tric. 1 : P1
9.BE.22KochiteNa3Ca2MnZrTi(Si2O7)2OF3Tric. 1 : P1
9.BE.23DovyreniteCa6Zr(Si2O7)2(OH)4Orth. mmm (2/m 2/m 2/m) : Pnnm
9.BE.25Barytolamprophyllite(Ba,Na)2(Na,Ti,Fe3+)4Ti2(Si2O7)2O(OH,F)Mon.
9.BE.25EricssoniteBaMn2+2Fe3+(Si2O7)O(OH)Mon. 2/m : B2/m
9.BE.25Lamprophyllite(Na,Mn2+)3(Sr,Na)2(Ti,Fe3+)3(Si2O7)2O2(OH,O,F)2Mon.
9.BE.25Ericssonite-2OBaMn2+2Fe3+(Si2O7)O(OH)Orth.
9.BE.25SeidozeriteNa4MnZr2Ti(Si2O7)2O2F2Mon.
9.BE.25NabalamprophylliteNa3(Ba,Na)2Ti3(Si2O7)2O2(OH,F)2Mon. 2/m
9.BE.25GrenmariteNa4MnZr3(Si2O7)2O2F2Mon. 2/m : P2/b
9.BE.25SchülleriteBa2Na(Mn,Ca)(Fe3+,Mg,Fe2+)2Ti2(Si2O7)2(O,F)4Tric. 1 : P1
9.BE.25LileyiteBa2(Na,Fe,Ca)3MgTi2(Si2O7)2O2F2Mon. 2/m : B2/m
9.BE.27MurmaniteNa2Ti2(Si2O7)O2 · 2H2OTric.
9.BE.30EpistoliteNa2(Nb,Ti)2(Si2O7)O2 · nH2OTric.
9.BE.32LomonosoviteNa5Ti2(Si2O7)(PO4)O2Tric.
9.BE.35VuonnemiteNa11Ti4+Nb2(Si2O7)2(PO4)2O3(F,OH)Tric.
9.BE.37SoboleviteNa13Ca2Mn2Ti3(Si2O7)2(PO4)4O3F3Mon. m : Pb
9.BE.40InneliteNa2CaBa4Ti3(Si2O7)2(SO4)2O4Tric. 1 : P1
9.BE.40PhosphoinneliteNa3Ba4Ti3(Si2O7)2(PO4,SO4)2O2FTric.
9.BE.42YoshimuraiteBa2Mn2Ti(Si2O7)(PO4)O(OH)Tric. 1 : P1
9.BE.45QuadruphiteNa14Ca2Ti4(Si2O7)2(PO4)2O2FTric.
9.BE.47PolyphiteNa5(Na4Ca2)Ti2(Si2O7)(PO4)3O2F2Tric. 1 : P1
9.BE.50BornemaniteNa6BaTi2Nb(Si2O7)2(PO4)O2(OH)F Tric. 1 : P1
9.BE.50ShkatulkaliteNa10Mn2+Ti3Nb3(Si2O7)6(OH)2F · 12H2OMon.
9.BE.55BafertisiteBa2Fe2+4Ti2(Si2O72O2(OH)2F2Tric.
9.BE.55HejtmaniteBa2(Mn2+,Fe2+)4Ti2(Si2O7)2O2(OH)2F2Tric. 1
9.BE.55Bykovaite(Ba,Na,K)2(Na,Ti,Mn)4(Ti,Nb)2(Si2O7)2O2(H2O,F,OH)2 · 3.5H2OMon. 2/m
9.BE.55Nechelyustovite(Ba,Sr,K)2(Na,Ti,Mn)4(Ti,Nb)2(Si2O7)2O2(O,H2O,F)2 · 4.5H2OMon. 2/m : B2/m
9.BE.60Delindeite(Na,K)2(Ba,Ca)2(Ti,Fe,Al)3(Si2O7)2O2(OH)2 · 2H2OMon.
9.BE.65BusseniteNa2Ba2Fe2+Ti(Si2O7)(CO3)(OH)3FTric. 1 : P1
9.BE.67JinshajiangiteBaNaFe2+4Ti2(Si2O7)2O2(OH)2FMon. 2/m
9.BE.67PerraultiteBaNaMn2+4Ti2(Si2O7)2O2(OH)2FMon. 2/m : B2/m
9.BE.67SurkhobiteNaCaBa2Mn8Ti4(Si2O7)4O5F5
9.BE.70Karnasurtite-(Ce)(Ce,La,Th)(Ti,Nb)(Al,Fe)(Si2O7)(OH)4 · 3H2O
9.BE.70Perrierite-(Ce)Ce4MgFe3+2Ti2(Si2O7)2O8
9.BE.70Strontiochevkinite(Sr,La,Ce,Ca)4Fe2+(Ti,Zr)2Ti2(Si2O7)2O8Mon.
9.BE.70Chevkinite-(Ce)(Ce,La,Ca,Th)4(Fe2+,Mg)(Fe2+,Ti,Fe3+)2(Ti,Fe3+)2(Si2O7)2O8Mon.
9.BE.70Polyakovite-(Ce)(Ce,Ca)4(Mg,Fe2+)(Cr3+,Fe3+)2(Ti,Nb)2(Si2O7)2O8Mon. 2/m : B2/m
9.BE.70RengeiteSr4ZrTi4(Si2O7)2O8Mon. 2/m : P21/b
9.BE.70MatsubaraiteSr4Ti5(Si2O7)2O8Mon. 2/m : P21/b
9.BE.70Dingdaohengite-(Ce)(Ce,La)4Fe2+(Ti,Fe2+,Mg,Fe2+)2Ti2(Si2O7)2O8Mon. 2/m : P21/b
9.BE.70Maoniupingite-(Ce)(Ce,Ca)4(Fe3+,Ti,Fe2+,◻)(Ti,Fe3+,Fe2+,Nb)4(Si2O7)2O8Mon. 2/m : B2/m
9.BE.70Perrierite-(La)(La,Ce,Ca)4(Fe,Mn2+,Mg)Fe3+2(Ti,Fe3+)2(Si2O7)2O8Mon. 2/m : P21/b
9.BE.70UKI-2008-(SiO:SrTiZr)Sr4ZrTi4(Si2O7)2O8Orth. mmm (2/m 2/m 2/m) : Pbca
9.BE.70Hezuolinite(Sr,REE)4Zr(Ti,Fe3+)4(Si2O7)2O8Mon. 2/m : B2/m
9.BE.72FersmaniteCa4(Na,Ca)4(Ti,Nb)4(Si2O7)2O8F3Tric.
9.BE.75BelkoviteBa3(Nb,Ti)6(Si2O7)2O12Hex.
9.BE.77NasonitePb6Ca4(Si2O7)3Cl2Hex.
9.BE.80MelanotekitePb2Fe3+2(Si2O7)O2Orth.
9.BE.82TilleyiteCa5(Si2O7)(CO3)2Mon.
9.BE.85KillalaiteCa6.4(H0.6Si2O7)2(OH)2Mon.
9.BE.87Stavelotite-(La)(La,Nd,Ca)3Mn2+3Cu(Mn3+,Fe3+,Mn4+)26(Si2O7)6O30Trig. 3 : P31
9.BE.90Biraite-(Ce)Ce2Fe2+(Si2O7)(CO3)Mon. 2/m : P21/b
9.BE.92Cervandonite-(Ce)(Ce,Nd,La)(Fe3+,Fe2+,Ti,Al)3O2(Si2O7)(As3+O3)(OH)Trig. 3m : R3m
9.BE.95BatisiviteBaV3+8Ti6(Si2O7)O22Tric. 1 : P1

Related Minerals - Dana Grouping (8th Ed.)Hide

56.2.10.1MelanotekitePb2Fe3+2(Si2O7)O2Orth.
56.2.10.6Caryochroite(Na,Sr)3(Fe3+,Mg)10[(O,OH)9|Ti2Si12O37] · (H2O,O,OH)17Mon.
56.2.10.6Nechelyustovite(Ba,Sr,K)2(Na,Ti,Mn)4(Ti,Nb)2(Si2O7)2O2(O,H2O,F)2 · 4.5H2OMon. 2/m : B2/m
56.2.10.7Bykovaite(Ba,Na,K)2(Na,Ti,Mn)4(Ti,Nb)2(Si2O7)2O2(H2O,F,OH)2 · 3.5H2OMon. 2/m

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.13.1AlamositePbSiO3Mon.
14.13.2PlumbotsumitePb13(CO3)6(Si10O27) · 3H2OOrth.
14.13.3LuddeniteCu2Pb2Si5O14 · 4H2OMon.
14.13.4MolybdophyllitePb8Mg9[Si10O28(OH)8|O2|(CO3)3] · H2O Mon. 2 : B2
14.13.5MargarosanitePb(Ca,Mn2+)2(Si3O9)Tric. 1 : P1
14.13.6GanomalitePb9Ca5Mn(Si2O7)4(SiO4)OHex.
14.13.8BarysilitePb8Mn2+[Si2O7]3Trig.
14.13.9MelanotekitePb2Fe3+2(Si2O7)O2Orth.
14.13.10CreaseyitePb2Cu2Fe3+2(Si4.67Al0.33)O15.33(OH)3 · H2OOrth. mmm (2/m 2/m 2/m) : Cmcm

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 KentroliteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Flink, G. (1891): Mineralogische Notizen III, 7. Kentrolith von Langbanshyttan, Meddelanden fran Stockholms Högskola, Vol. 115, pp. 14-20
American Mineralogist (1967): 52: 1085-1093.
Gabelica-Robert, M. & Tarte, P. (1979): Synthesis, x-ray diffraction and vibrational study of silicates and germanates isostructural with kentrolite (Pb2Mn2Si2O9). J. Solid State Chem. 27, 179-190.
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 KentroliteHide

Localities for KentroliteHide

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.
France
 
  • Occitanie
    • Tarn
      • Réalmont
        • Montredon-Labessonnié
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
 
  • Karagandy Province (Qaragandy Oblysy; Karaganda Oblast')
    • Zhayrem (Zhairem)
Frank Dzubeck; Evseev, A. A. (1995) Kazaknstan and Middle Asia. A brief Mineralogical Guide. World of Stone 8:24-30
Frank Dzubeck
Frank Dzubeck
Namibia
 
  • Otjozondjupa Region
    • Grootfontein District
      • Kombat
Dunn, P.J. (1991), Rare minerals of the Kombat Mine, Mineralogical Record: 22(6): 421-425.
Norway
 
  • Oppland
    • Lunner
      • Grua
        • Grua Mining District
Raade, G. (1982): Kentrolitt fra Skjerpemyr, Grua. in Geologisk Museum. Interne notater 1961-1990. Published by Geologisk Museums Venner, Oslo 1991, p 92-93; Neumann, H. (1985): Norges Mineraler. Norges Geologiske Undersøkelse Skrifter 68, p. 164; Harald Folvik (2005): Mineralene på Skjerpemyr. STEIN 32 (1), 4-9 (in norwegian)
South Africa
 
  • Northern Cape Province
    • Kalahari manganese field
      • Hotazel
Von Bezing, K. L. et al. (1991) The Kalahari manganese field: An Update, Mineralogical Record 22(4) 279-302;
    • Postmasburg manganese field
      • Kathu
        • Sishen
John M. Moore, Barbara K. Kuhn, Darren F. Mark, and Harilaos Tsikos (2011): A sugilite-bearing assemblage from the Wolhaarkop breccia, Bruce iron-ore mine, South Africa: Evidence for alkali metasomatism and 40Ar-39Ar dating. Eur. J. Mineral. 23, 661-673.
Moore, J.M., Kuhn, B., Mark, D.F., Tsikos, H. (2011): A sugilite-bearing assemblage from the Wolhaarkop breccia, Bruce iron-ore mine, South Africa: Evidence for alkali metasomatism and 40Ar-39Ar dating. European Journal of Mineralogy: 23: 661-673; http://forum.amiminerals.it/viewtopic.php?f=5&t=7909 (2016)
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.
Adolfsson, S. G. (1979): Notes on Recent Underground Collecting at Långban. Mineralogical Record. 10: 215-217
Kjell Gatedal
      • Persberg district
        • Pajsberg
No reference listed
  • Västmanland
    • Lindesberg
Kjell Gatedal Photo (7809)
    • Norberg
Ounchanum, P. & Morad, S. (1987): Paragenesis of akatoreite and ganophyllite in the manganiferous rocks of the Häste Field, Norberg ore district, central Sweden. Neues Jahrbuch für Mineralogie, Abhandlungen 157, 225-244.
UK
 
  • England
    • Somerset
      • Cranmore
Turner, R.W. and Rumsey, M.S. (2010): Mineral Relationships in the Mendip Hills. Journal of the Russell Society, vol 13, pp 3-46; 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);
      • Holwell
BMS Database
      • Mendip Hills
        • 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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