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About TruscottiteHide

(Ca,Mn)14Si24O58(OH)8 · 2H2O
Colourless, white
Specific Gravity:
2.47 - 2.48
Crystal System:
Member of:
Named after Samuel John Truscott (1870-1950), professor of mining, Royal School of Mines, London (England).
This page provides mineralogical data about Truscottite.

Classification of TruscottiteHide

Approved, 'Grandfathered' (first described prior to 1959)
First Published:

9 : SILICATES (Germanates)
E : Phyllosilicates
E : Single tetrahedral nets of 6-membered rings connected by octahedral nets or octahedral bands

73 : PHYLLOSILICATES Condensed Tetrahedral Sheets
2 : Condensed Tetrahedral Sheets with double and single layers

14 : Silicates not Containing Aluminum
18 : Silicates of Mn and Na, K, Mg, Ca or Fe

Pronounciation of TruscottiteHide

PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of TruscottiteHide

on cleavage
Colourless, white
3½ on Mohs scale
on {0001}
2.47 - 2.48 g/cm3 (Measured)    2.47 g/cm3 (Calculated)

Optical Data of TruscottiteHide

Uniaxial (-)
RI values:
nω = 1.549 - 1.552 nε = 1.522 - 1.530
Max Birefringence:
δ = 0.027
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:

Chemical Properties of TruscottiteHide

(Ca,Mn)14Si24O58(OH)8 · 2H2O
IMA Formula:
Ca14Si24O58(OH)8 · 2H2O
Common Impurities:

Crystallography of TruscottiteHide

Crystal System:
Cell Parameters:
a = 9.73 Å, c = 18.83 Å
a:c = 1 : 1.935
Unit Cell V:
1,543.86 ų (Calculated from Unit Cell)
Scales, spheroidal aggregates of fibrous platy crystals

Type Occurrence of TruscottiteHide

Place of Conservation of Type Material:
Natural History Museum, London 1925,1044
Geological Setting of Type Material:
Epithermal gold, silver quartz veins in altered pyroclastics.
Hövig, P. (1914) Truscottiet. Jaarboek van het Mijnwezen in Nederlandsch Oost-Indië, Batavia: 41: 192-215 (202).

Other Language Names for TruscottiteHide


Relationship of Truscottite to other SpeciesHide

Member of:
Other Members of this group:
KodamaiteNa3(Ca5Na)Si16O36(OH)4F2 · (14-x)H2O Tric. 1 : P1
Reyerite(Na,K)2Ca14(Si,Al)24O58(OH)8 · 6H2OTrig.

Common AssociatesHide

Associated Minerals Based on Photo Data:
1 photo of Truscottite associated with Thomsonite

Related Minerals - Nickel-Strunz GroupingHide

9.EE.CairncrossiteSr2Ca7-xNa2x(Si4O10)4(OH)2(H2O)15-xTric. 1 : P1
9.EE.10BrokenhilliteMn8Si6O15(OH)10Hex. 6mm : P63mc
9.EE.10Pyrosmalite-(Fe)Fe2+8Si6O15(OH,Cl)10Trig. 3m (3 2/m) : P3m1
9.EE.10FriedeliteMn2+8Si6O15(OH,Cl)10Mon. 2/m : B2/m
9.EE.10Mcgillite(Mn,Fe)8Si6O15(OH)8Cl2Mon. 2/m : B2/m
9.EE.15SchalleriteMn2+16As3Si12O36(OH)17Trig. 3m : P3m1
9.EE.20Palygorskite(Mg,Al)2Si4O10(OH) · 4H2OMon. 2/m : B2/m
9.EE.20TuperssuatsiaiteNa2(Fe3+,Mn2+)3Si8O20(OH)2 · 4H2OMon. 2/m : B2/m
9.EE.20YofortieriteMn5Si8O20(OH)2 · 8-9H2OMon. 2/m : B2/m
9.EE.20WindhoekiteCa2Fe3+2.67[Si8O20](OH)4 · 10H2O Mon. 2/m : B2/m
9.EE.25Falcondoite(Ni,Mg)4Si6O15(OH)2 · 6H2OOrth.
9.EE.25LoughliniteNa2Mg3Si6O16 · 8H2OOrth.
9.EE.25SepioliteMg4(Si6O15)(OH)2 · 6H2OOrth. mmm (2/m 2/m 2/m) : Pnna
9.EE.25Kalifersite(K,Na)5Fe3+7Si20O50(OH)6 · 12H2OTric.
9.EE.30GyroliteNaCa16Si23AlO60(OH)8 · 14H2OTric. 1 : P1
9.EE.30OrlymaniteCa4Mn3Si8O20(OH)6 · 2H2OHex.
9.EE.30TungusiteCa4Fe2Si6O15(OH)6Tric. 1 : P1
9.EE.35Reyerite(Na,K)2Ca14(Si,Al)24O58(OH)8 · 6H2OTrig.
9.EE.45MakatiteNa2Si4O8(OH)2 · 4H2OMon. 2/m : P21/b
9.EE.50VarennesiteNa8Mn2Si10O25(OH,Cl)2 · 12H2OOrth.
9.EE.55RaiteNa4Mn2+3Ti0.25Si8O20(OH)2 · 10H2OOrth. 2 2 2 : C2 2 2
9.EE.60IntersiliteNa6Mn2+Ti[Si10O24(OH)](OH)3 · 4H2OMon.
9.EE.65ShafranovskiteNa3K2(Mn,Fe,Na)4[Si9(O,OH)27](OH)2 · nH2OTrig.
9.EE.65ZakharoviteNa4Mn5Si10O24(OH)6 · 6H2OTrig.
9.EE.70ZeophylliteCa13Si10O28(OH)2F8 · 6H2OTrig. 3 : R3
9.EE.80Fedorite(Na,K)2-3(Ca4Na3)Si16O38(OH,F)2 · 3.5H2OTric. 1 : P1
9.EE.80Martinite(Na,◻,Ca)12Ca4(Si,S,B)14B2O38(OH,Cl)2F2 · 4H2OTric. 1 : P1
9.EE.85Lalondeite(Na,Ca)6(Ca,Na)3Si16O38(F,OH)2 · 3H2OTric. 1 : P1

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

73.2.2a.1Reyerite(Na,K)2Ca14(Si,Al)24O58(OH)8 · 6H2OTrig.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.18.3ZakharoviteNa4Mn5Si10O24(OH)6 · 6H2OTrig.
14.18.4NorrishiteKLiMn3+2(Si4O10)O2Mon. 2/m : B2/m
14.18.5ShafranovskiteNa3K2(Mn,Fe,Na)4[Si9(O,OH)27](OH)2 · nH2OTrig.
14.18.6AbswurmbachiteCuMn3+6(SiO4)O8Tet. 4/mmm (4/m 2/m 2/m) : I41/acd
14.18.8KanoiteMn2+(Mg,Mn2+)Si2O6Mon. 2/m : P21/b
14.18.13BustamiteCaMn2+(Si2O6)Tric. 1 : P1
14.18.14GlaucochroiteCaMn2+SiO4Orth. mmm (2/m 2/m 2/m)
14.18.16SantaclaraiteCaMn4[Si5O14OH](OH) · H2OTric.
14.18.18JohannseniteCaMn2+Si2O6Mon. 2/m : B2/b
14.18.19NeltneriteCaMn3+6(SiO4)O8Tet. 4/mmm (4/m 2/m 2/m) : I41/acd
14.18.20OrlymaniteCa4Mn3Si8O20(OH)6 · 2H2OHex.
14.18.21InesiteCa2(Mn,Fe)7Si10O28(OH)2 · 5H2OTric. 1 : P1
14.18.22OrientiteCa8Mn3+10(SiO4)3(Si3O10)3(OH)10 · 4H2O Orth.
14.18.23RuiziteCa2Mn3+2[Si4O11(OH)2](OH)2 · 2H2OMon. 2
14.18.24BostwickiteCaMn3+6Si3O16 · 7H2OOrth.
14.18.25KittatinnyiteCa2Mn2Mn(SiO4)2(OH)4 · 9H2OHex.
14.18.27SeranditeNaMn2+2Si3O8(OH)Tric. 1 : P1
14.18.29MarsturiteNaCaMn3Si5O14(OH)Tric. 1 : P1
14.18.30RaiteNa4Mn2+3Ti0.25Si8O20(OH)2 · 10H2OOrth. 2 2 2 : C2 2 2
14.18.31Richterite{Na}{NaCa}{Mg5}(Si8O22)(OH)2Mon. 2/m : B2/m
14.18.32Byelorussite-(Ce)NaBa2Ce2MnTi2[Si4O12]2O2(F,OH) · H2OOrth. mm2 : Ama2
14.18.35PyroxmangiteMnSiO3Tric. 1
14.18.37Neotocite(Mn,Fe,Mg)SiO3 · H2OAmor.
14.18.38BabingtoniteCa2(Fe,Mn)FeSi5O14(OH)Tric. 1 : P1

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 TruscottiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Hövig, P. (1914) Truscottiet. Jaarboek van het Mijnwezen in Nederlandsch Oost-Indië, Batavia: 41: 192-215 (202).
Spencer, L.J. (1925) Tenth list of new mineral names; with an index of authors. Mineralogical Magazine: 20: 466-466.
Foshag, W.F. (1928) New mineral names. American Mineralogist: 13: 201-202.
Mackay, A.L., Taylor, H.F.W. (1954) Truscottite. Mineralogical Magazine: 30(226): 450-457.
Mamedov, K.S., Belov, N.V. (1958) Crystal structure of mica-like hydrous calcium silicates: okenite, nekoite, truscottite, and gyrolite New silicate radical [Si6O15]. Doklady Akademii Nauk SSSR: 121: 713-716.
Fleischer, M. (1959) New mineral names. American Mineralogist: 44: 464-470 (470).
Fleischer, M., Mandarino, J.A., Strunz, H., Cech, F. (1965) New mineral names. American Mineralogist: 50: 261-268.
Minato, H., Kato, A. (1967) Truscottite from the Toi Mine, Shizuoka Prefecture. Mineralogical Journal: 5: 144-156.
Fleischer, M. (1968) New mineral names. American Mineralogist: 53: 507-511.
Juan, V.C., Youh, C.C., Lo, H.J. (1970) The dehydration reaction of natural truscottite. In Proceedings of the Geological Society of China: 13: 34-40.
Gard, J.A., Mitsuda, T., Taylor, H.F.W. (1975) Assarsson's Z-phase and its structural relations to gyrolite, truscottite, and reyerite. Mineralogical Magazine: 40: 325-333.
Lachowski, E.E., Murray, L.W., Taylor, H.F.W. (1979) Truscottite: composition and ionic substitutions. Mineralogical Magazine: 43: 333-336.
Luke, K., Taylor, H.F.W., Kalousek, G.L. (1981) Some factors affecting formation of truscottite and xonotlite at 300–350° C. Cement and Concrete Research: 11(2): 197-203.
Izawa, E. (1995) On the truscottite from the Hishikari deposit, Kagoshima Pref. (abstract). Resource Geology: 45: 251-252.
Garbev, K., Gasharova, B., Stumm, A., Black, L., Mathis, Y.L., Stemmermann, P. (2004) Phase transition of gyrolite into truscottite upon thermal treatment as studied at the ANKA infrared and XRD beamlines. Mineralogische und Technische Kristallographie: 21: 118.

Internet Links for TruscottiteHide

Localities for TruscottiteHide

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.
  • Réunion
DE ASCENCAO GUEDES R.(2005) La truscottite de Cilaos (Ile de la Réunion), Le Règne Minéral, 65, 11 (in French).
Serge Lavarde Collection
collection Joachim Esche;;;; (Serge Lavarde message).
Serge Lavarde collection
Indonesia (TL)
  • Bengkulu Province
    • Rejang Lebong District (Rediang Lebong District)
Jaarboek van het Mijnwezen in Nederlandsch Oost-Indie, Verhandl.(1914) 41, 202; Mineralogical Magazine(1979) 43, 333-336
  • Kagoshima Prefecture
Excalibur Mineral Company specimen; Yamada, S. (2004) Nihonsan-koubutsu Gojuon-hairetsu Sanchi-ichiranhyou (111 pp.)
Fermor 2011: Ore Deposits in an Evolving Earth
  • Shizuoka Prefecture
    • Izu City
Mineralogical Magazine 1964 33 : 821-840
Middle East
Gross, S. (1977): The Mineralogy of the Hatrurim Formation, Israel. Geological Survey of Israel, Bulletin no. 70, 80 pp.
South Africa
  • KwaZulu-Natal
    • eThekwini Metropolitan Municipality
      • Durban
        • Umhlatuzana valley
Cairncross, B. & Dixon, R. (1995). Cairncross, B., Dixon, R. (1995) Cairncross, B., Dixon, R. (1995) Minerals of South Africa. Geological Society of South Africa, PO Box 44283, Linden 2104, South Africa.. Geological Society of South Africa: Linden; Heron. H.D.C. (2004). Barite occurrences at Clairwood Quarries in Durban, Natal, South Africa. S.A. Lapidary Magazine, 36(3): 5-25.
  • Wyoming
    • Park Co.
Bargar, K.E.; Beeson, M.H. & Keith, T.E.C. (1981): Zeolites in Yellowstone National Park. Mineralogical Record 12, 29-38
Bargar, K.E.; Beeson, M.H. & Keith, T.E.C. (1981): Zeolites in Yellowstone National Park. Mineralogical Record 12, 29-38
Mineral and/or Locality  
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