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Trabzonite

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Trabzon, Turkey
Formula:
Ca4(Si3O9)(OH)2
Colour:
Colourless
Lustre:
Vitreous
Specific Gravity:
2.9
Crystal System:
Orthorhombic
Name:
Named after the province of Trabzon, Turkey, that includes the type locality of Ikizdere, northwest of Varda Yaylasi.
Dimorph of:
Related to killalaite and dellaite.


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Classification of TrabzoniteHide

Approved
Approval Year:
1983
First Published:
1986
9.BJ.15

9 : SILICATES (Germanates)
B : Sorosilicates
J : Sorosilicates with Si3O10, Si4O11, etc. anions; cations in octahedral [6] and greater coordination
57.1.3.1

57 : SOROSILICATES Si3O10 Groups and Larger Noncyclic Groups
1 : Insular Si3O10 and Larger Noncyclic Groups with [Si3O10] groups
14.5.20

14 : Silicates not Containing Aluminum
5 : Silicates of Ca

Physical Properties of TrabzoniteHide

Vitreous
Transparency:
Transparent
Colour:
Colourless
Streak:
White
Cleavage:
None Observed
Fracture:
Conchoidal
Density:
2.9 g/cm3 (Measured)    
Comment:
Measured by suspension

Optical Data of TrabzoniteHide

Type:
Biaxial (+)
RI values:
nα = 1.632 nβ = 1.634 nγ = 1.640
2V:
Measured: 55° to 60°, Calculated: 62°
Max Birefringence:
δ = 0.008
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
weak to distinct

Chemical Properties of TrabzoniteHide

Formula:
Ca4(Si3O9)(OH)2
IMA Formula:
Ca4[Si3O9(OH)](OH)
Common Impurities:
Al,Mn,Mg,Na

Crystallography of TrabzoniteHide

Crystal System:
Orthorhombic
Class (H-M):
mm2 - Pyramidal
Space Group:
Ama2
Cell Parameters:
a = 20.6 Å, b = 9.1 Å, c = 10.3 Å
β = 98°
Ratio:
a:b:c = 2.264 : 1 : 1.132
Unit Cell V:
1,930.84 ų (Calculated from Unit Cell)
Comment:
Originally assumed to be P21/m.

Type Occurrence of TrabzoniteHide

General Appearance of Type Material:
Irregular grains to 0.2 mm.
Place of Conservation of Type Material:
Natural History Museum, Geneva, Switzerland, 435/78.
Geological Setting of Type Material:
Retrograde skarn
Reference:
Sarp, H., Burri, G. (1986) Trabzonite Ca4Si3O10·2H2O a new hydrated calcium silicate. Schweizerische Mineralogische und Petrographische Mitteilungen: 66: 453-453.

Synonyms of TrabzoniteHide

Other Language Names for TrabzoniteHide

German:Trabzonit
Spanish:Trabzonita

Related Minerals - Nickel-Strunz GroupingHide

9.BJ.05OrientiteCa8Mn3+10(SiO4)3(Si3O10)3(OH)10 · 4H2O Orth.
9.BJ.10RosenhahniteHCa3[Si3O9(OH)]Tric.
9.BJ.20Thalénite-(Y)Y3Si3O10FMon.
9.BJ.25TiragalloiteMn2+4As5+Si3O12(OH)Mon. 2/m
9.BJ.30MedaiteMn2+6V5+Si5O18(OH)Mon.
9.BJ.35RuiziteCa2Mn3+2[Si4O11(OH)2](OH)2·2H2OMon. 2
9.BJ.40Ardennite-(As)Mn2+4Al4(AlMg)(AsO4)(SiO4)2(Si3O10)(OH)6Orth. mmm (2/m 2/m 2/m)
9.BJ.40Ardennite-(V)Mn2+4Al4(AlMg)(VO4)(SiO4)2(Si3O10)(OH)6Orth. mmm (2/m 2/m 2/m) : Pmmn
9.BJ.45KilchoaniteCa6(SiO4)(Si3O10)Orth.
9.BJ.50KornerupineMg3Al6(Si,Al,B)5O21(OH)Orth. mmm (2/m 2/m 2/m)
9.BJ.50Prismatine(◻,Fe,Mg)(Mg,Al,Fe)5Al4Si2(Si,Al)2(B,Si,Al)(O,OH,F)22Orth.
9.BJ.55ZunyiteAl13Si5O20(OH,F)18ClIso. 4 3m : F4 3m
9.BJ.60HubeiteCa2Mn2+Fe3+[HSi4O13] · 2H2OTric.
9.BJ.65Cassagnaite(Ca,Mn2+)4(Fe3+,Mn3+,Al)4(V3+,Mg,Al)2(Si3O10)(SiO4)2(OH,O)8Orth. mmm (2/m 2/m 2/m) : Cmcm

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.5.1WollastoniteCaSiO3Tric. 1 : P1
14.5.2Wollastonite-7TCaSiO3
14.5.3Wollastonite-2MCaSiO3Mon.
14.5.4RankiniteCa3Si2O7Mon. 2/m : P21/b
14.5.5KilchoaniteCa6(SiO4)(Si3O10)Orth.
14.5.6LarniteCa2SiO4Mon.
14.5.7BredigiteCa7Mg(SiO4)4Orth.
14.5.8HatruriteCa3(SiO4)OTrig.
14.5.9RosenhahniteHCa3[Si3O9(OH)]Tric.
14.5.10DellaiteCa6Si3O11(OH)2Tric.
14.5.11AfwilliteCa3(HSiO4)2 · 2H2OMon. m : Bb
14.5.12XonotliteCa6(Si6O17)(OH)2Mon. 2/m
14.5.13FoshagiteCa4(Si3O9)(OH)2Tric.
14.5.14HillebranditeCa2(SiO3)(OH)2Orth. mmm (2/m 2/m 2/m) : Cmcm
14.5.15JaffeiteCa6(Si2O7)(OH)6Trig. 3 : P3
14.5.16SuoluniteCa2(H2Si2O7) · H2OOrth.
14.5.17KillalaiteCa6.4(H0.6Si2O7)2(OH)2Mon.
14.5.18OkeniteCa10Si18O46 · 18H2OTric. 1 : P1
14.5.19RiversideiteCa5(HSi3O9)2 · 2H2OOrth.
14.5.21GyroliteNaCa16Si23AlO60(OH)8 · 14H2OTric.
14.5.22FoshallasiteCa3[Si2O7] · 3H2O(?)
14.5.23Tobermorite[Ca4Si6O17 · 2H2O]·(Ca·3H2O)Orth.
14.5.24Clinotobermorite[Ca4Si6O17 · 2H2O]·(Ca·3H2O)Mon.
14.5.25NekoiteCa3Si6O15·7H2OTric. 1 : P1
14.5.26Plombièrite[Ca4Si6O16(OH)2 · 2H2O]·(Ca·5H2O)Orth.
14.5.27JenniteCa9(Si3O9)2(OH)8 · 8H2OTric.

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 TrabzoniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Sarp, H., Burri, G. (1986) Trabzonite Ca4Si3O10·2H2O a new hydrated calcium silicate. Schweizerische Mineralogische und Petrographische Mitteilungen: 66: 453-453.
Sarp, H., Burri, G. (1987) Yeni bir mineral, trabzonit, Ca4 Si3 O10 2H2O. Bulletin of the Geological Society of Turkey: 30: 57-60.
Jambor, J.L., Burke, E.A.J., Ercit, T.S., Grice, J.D. (1988) New mineral names. American Mineralogist: 73: 1492-1499.
Armbruster, T., Lazic, B., Gfeller, F., Galuskin, E.V., Galuskina, I.O., Savelyeva, V.B., Zadov, A.E., Pertsev, N.N., Dzierżanowski, P. (2011) Chlorine content and crystal chemistry of dellaite from the Birkhin gabbro massif, Eastern Siberia, Russia. Mineralogical Magazine: 75: 379-394.
Armbruster, T., Lazic, B., Galuskina, I.O., Galuskin, E.V., Gnos, E., Marzec, K.M., Gazeev, V.M. (2012) Trabzonite, Ca4[Si3O9(OH)]OH: crystal structure, revised formula, new occurrence and relation to killalaite. Mineralogical Magazine: 76: 455–472.

Internet Links for TrabzoniteHide

Localities for TrabzoniteHide

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.
Russia
 
  • Northern Caucasus Region
    • Kabardino-Balkarian Republic
      • Baksan Valley
        • Upper Chegem volcanic caldera (Verkhnechegemskaya caldera)
T. Armbruster, B. Lazic, I.O. Galuskina, E.V. Galuskin, E. Gnos, K.M. Marzec, V.M. Gazeev (2012): Trabzonite, Ca4[Si3O9(OH)]OH: crystal structure, revised formula, new occurrence and relation to killalaite. Mineralogical Magazine 76, 455–472.
Galuskina, I.O., Krüger, B., Galuskin, E.V. ,Armbruster, T., Gazeev, V.M., Włodyka, R., Dulski, M. & Dzierżanowski, P. (2015): Fluorchegemite, Ca7(SiO4)3F2, a new mineral from the edgrewitebearing endoskarn zone of an altered xenolith in ignimbrites from Upper Chegem Caldera, Northern Caucasus, Kabardina-balkaria, Russia; Occurrence, crystal structure, and new data on the mineral assemblages. Canadian Mineralogist. 53, 325-344.
Turkey (TL)
 
  • Black Sea Region
    • Rize Province
Am Min 73:11-12 p 1497; Sarp H, Burri G (1987) Yeni bir mineral, trabzonit, Ca4 Si3 O10 2H2O. Bulletin of the Geological Society of Turkey 30, 57-60; T. Armbruster, B. Lazic, I.O. Galuskina, E.V. Galuskin, E. Gnos, K.M. Marzec, V.M. Gazeev (2012): Trabzonite, Ca4[Si3O9(OH)]OH: crystal structure, revised formula, new occurrence and relation to killalaite. Mineralogical Magazine 76, 455–472.
Mineral and/or Locality  
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