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Truscottite

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About TruscottiteHide

Formula:
(Ca,Mn)14Si24O58(OH)8 · 2H2O
Colour:
Colourless, white
Lustre:
Pearly
Hardness:
Specific Gravity:
2.47 - 2.48
Crystal System:
Trigonal
Member of:
Name:
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)
9.EE.35

9 : SILICATES (Germanates)
E : Phyllosilicates
E : Single tetrahedral nets of 6-membered rings connected by octahedral nets or octahedral bands
73.2.2a.2

73 : PHYLLOSILICATES Condensed Tetrahedral Sheets
2 : Condensed Tetrahedral Sheets with double and single layers
14.18.15

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

Pronounciation of TruscottiteHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of TruscottiteHide

Pearly
Transparency:
Translucent
Comment:
on cleavage
Colour:
Colourless, white
Hardness:
3½ on Mohs scale
Cleavage:
Perfect
on {0001}
Fracture:
Micaceous
Density:
2.47 - 2.48 g/cm3 (Measured)    2.47 g/cm3 (Calculated)

Optical Data of TruscottiteHide

Type:
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:
Low

Chemical Properties of TruscottiteHide

Formula:
(Ca,Mn)14Si24O58(OH)8 · 2H2O
IMA Formula:
Ca14Si24O58(OH)8 · 2H2O
Common Impurities:
Ti,Al,Fe,Mg,Na,K,C,S

Crystallography of TruscottiteHide

Crystal System:
Trigonal
Cell Parameters:
a = 9.73 Å, c = 18.83 Å
Ratio:
a:c = 1 : 1.935
Unit Cell V:
1,543.86 ų (Calculated from Unit Cell)
Z:
1
Morphology:
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.

Other Language Names for TruscottiteHide

German:Truscottit
Spanish:Truscottita

Relationship of Truscottite to other SpeciesHide

Member of:
Other Members of this group:
Minehillite(K,Na)2-3Ca28Zn4Al4Si40O112(OH)16Hex.
Reyerite(Na,K)2Ca14(Si,Al)24O58(OH)8 · 6H2OTrig.

Common AssociatesHide

Associated Minerals Based on Photo Data:
Thomsonite1 photo of Truscottite associated with Thomsonite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.EE.05BementiteMn7Si6O15(OH)8Mon.
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.10Pyrosmalite-(Mn)Mn2+8Si6O15(OH,Cl)10Trig.
9.EE.10Mcgillite(Mn,Fe)8Si6O15(OH)8Cl2Mon. 2/m : B2/m
9.EE.15Nelenite(Mn,Fe)16(Si12O30)(OH)14[As3+3O6(OH)3]Mon.
9.EE.15SchalleriteMn2+16As3Si12O36(OH)17Trig. 3m : P3m1
9.EE.20Palygorskite(Mg,Al)5(Si,Al)8O20(OH)2 · 8H2OMon. 2/m : B2/m
9.EE.20TuperssuatsiaiteNa2Fe3Si8O20(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.
9.EE.30OrlymaniteCa4Mn3Si8O20(OH)6 · 2H2OHex.
9.EE.30TungusiteCa4Fe2Si6O15(OH)6
9.EE.35Reyerite(Na,K)2Ca14(Si,Al)24O58(OH)8 · 6H2OTrig.
9.EE.40NatrosiliteNa2Si2O5Mon.
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.65Shafranovskite(Na,K)6(Mn,Fe)3Si9O24 · 6H2OTrig.
9.EE.65ZakharoviteNa4Mn5Si10O24(OH)6 · 6H2OTrig.
9.EE.70ZeophylliteCa13Si10O28(OH)2F8 · 6H2OTrig. 3 : R3
9.EE.75Minehillite(K,Na)2-3Ca28Zn4Al4Si40O112(OH)16Hex.
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

14.18.1NambuliteLiMn2+4Si5O14(OH)Tric.
14.18.2Natronambulite(Na,Li)(Mn,Ca)4Si5O14OHTric.
14.18.3ZakharoviteNa4Mn5Si10O24(OH)6 · 6H2OTrig.
14.18.4NorrishiteKLiMn3+2(Si4O10)O2Mon. 2/m : B2/m
14.18.5Shafranovskite(Na,K)6(Mn,Fe)3Si9O24 · 6H2OTrig.
14.18.6AbswurmbachiteCuMn3+6(SiO4)O8Tet. 4/mmm (4/m 2/m 2/m) : I41/acd
14.18.7Donpeacorite(Mn2+,Mg)Mg[SiO3]2Orth.
14.18.8KanoiteMn2+(Mg,Mn2+)Si2O6Mon. 2/m : P21/b
14.18.9CaryopiliteMn2+3Si2O5(OH)4Mon.
14.18.10Gonyerite(Mn2+,Mg)5Fe3+(Fe3+Si3O10)(OH)8
14.18.11Tirodite
14.18.12Manganhumite(Mn2+,Mg)7(SiO4)3(OH)2Orth.
14.18.13BustamiteCaMn2+(Si2O6)Tric. 1 : P1
14.18.14GlaucochroiteCaMn2+SiO4Orth.
14.18.16SantaclaraiteCaMn4[Si5O14OH](OH) · H2OTric.
14.18.17FerrobustamiteCaFe2+(Si2O6)Tric.
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
14.18.24BostwickiteCaMn6Si3O16 · 7H2OOrth.
14.18.25KittatinnyiteCa2Mn2Mn(SiO4)2(OH)4 · 9H2OHex.
14.18.26LithiomarsturiteLiCa2Mn2Si5O14(OH)Tric.
14.18.27SeranditeNaMn2+2Si3O8(OH)Tric. 1 : P1
14.18.28KvanefjelditeNa4(Ca,Mn)(Si3O7)2(OH)2Orth.
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) · H2O
14.18.33Deerite(Fe,Mn)6(Fe,Al)3[Si6O17]O3(OH)5Mon.
14.18.34Calderite(Mn2+,Ca)3(Fe3+,Al)2(SiO4)3Iso.
14.18.35PyroxmangiteMnSiO3Tric. 1
14.18.36Dannemorite☐{Mn2+2}{Fe2+5}(Si8O22)(OH)2
14.18.37Neotocite(Mn,Fe,Mg)SiO3 · H2OAmor.
14.18.38BabingtoniteCa2(Fe,Mn)FeSi5O14(OH)Tric. 1 : P1
14.18.39ManganbabingtoniteCa2(Mn,Fe)FeSi5O14(OH)Tric.
14.18.40ÖrebroiteMn2+3(Sb5+,Fe3+)(SiO4)(O,OH)3Hex.

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)
Jaarboek van het Mijnwezen in Nederlandsch Oost-Indie, Verhandl. (1914), 41, 202.
Mamedov, K.S. and 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.
American Mineralogist (1959): 44: 470.
American Mineralogist (1968): 53: 511.
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.
Mineralogical Magazine (1979): 43: 333-336.

Internet Links for TruscottiteHide

Localities for TruscottiteHide

ⓘ - 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.
Indonesia (TL)
 
  • Sumatra (Sumatera)
    • Bengkulu Province (Benkoelen Province; Benkulen 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
Israel
 
  • Negev
Gross, S. (1977): The Mineralogy of the Hatrurim Formation, Israel. Geological Survey of Israel, Bulletin no. 70, 80 pp.
Japan
 
  • Honshu Island
    • Chubu Region
      • Shizuoka Prefecture
        • Toi-cho
Mineralogical Magazine 1964 33 : 821-840
  • Kyushu Region
    • Kagoshima Prefecture
Excalibur Mineral Company specimen; Yamada, S. (2004) Nihonsan-koubutsu Gojuon-hairetsu Sanchi-ichiranhyou (111 pp.)
Réunion Island
 
  • Piton des Neiges Massif
DE ASCENCAO GUEDES R.(2005) La truscottite de Cilaos (Ile de la Réunion), Le Règne Minéral, 65, 11 (in French).
collection Joachim Esche
http://www.micromineral-market.com/Shop/truscottite-france-la-reunion-raider-ouaki.html?___store=micromineralmarket_en&___from_store=micromineralmarket_fr; https://www.mindat.org/article.php/855/My+swap+list; https://e-rocks.com/item/ros196985/truscottite; https://e-rocks.com/item/ugo599905/truscottite; https://www.mindat.org/mesg-20-48311.html (Serge Lavarde message).
      • Cilaos
Serge Lavarde Collection
Serge Lavarde collection
South Africa
 
  • KwaZulu-Natal Province
    • eThekwini District
      • Durban
        • Umhlatuzana valley
Cairncross, B. & Dixon, R. (1995). Minerals of 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.
USA
 
  • 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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