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Serandite

A valid IMA mineral species - grandfathered
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About SeranditeHide

Formula:
NaMn2+2Si3O8(OH)
Colour:
Pale pink, salmon-red, salmon-orange, deep orange, rose-red, brown, colourless
Lustre:
Vitreous, Sub-Vitreous, Greasy
Hardness:
5 - 5½
Specific Gravity:
3.34
Crystal System:
Triclinic
Name:
Named in 1931 by Antoine François Alfred Lacroix after J.M. Serand, lighthouse keeper of the Island of Rouma, Los, who assisted collecting the mineral and who coincidentally had a rosey pink complexion.

The name was modified in 2015 from sérandite to serandite by IMA approval 15-E.
Pectolite-Serandite Series. The manganese analogue of pectolite and the sodium analogue of tanohataite. Part of serandite-schizolite-pectolite series.

Many of the lighter pink "serandites" are schizolite. They can't be sorted visually. None of the deep orange serandites are schizolite. Compare also marshallsussmanite.




Unique IdentifiersHide

Mindat ID:
3622
Long-form identifier:
mindat:1:1:3622:7
GUID
(UUID V4):
f55aa0fb-9377-4f45-b818-e357e4f78d65

IMA Classification of SeranditeHide

Classification of SeranditeHide

9.DG.05

9 : SILICATES (Germanates)
D : Inosilicates
G : Inosilicates with 3-periodic single and multiple chains
65.2.1.5

65 : INOSILICATES Single-Width,Unbranched Chains,(W=1)
2 : Single-Width Unbranched Chains, W=1 with chains P=3
14.18.27

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

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
SrdIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of SeranditeHide

Vitreous, Sub-Vitreous, Greasy
Transparency:
Transparent, Translucent
Comment:
Fibrous aggregates are dull to silky
Colour:
Pale pink, salmon-red, salmon-orange, deep orange, rose-red, brown, colourless
Streak:
White
Hardness:
5 - 5½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
On {001} and {100}
Fracture:
Irregular/Uneven, Splintery
Density:
3.34 g/cm3 (Measured)    3.42 g/cm3 (Calculated)

Optical Data of SeranditeHide

Type:
Biaxial (+)
RI values:
nα = 1.668 nβ = 1.671 nγ = 1.703
2V:
Measured: 39° , Calculated: 39°
Birefringence:
0.035
Max Birefringence:
δ = 0.035
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
r < v moderate

Chemistry of SeranditeHide

Mindat Formula:
NaMn2+2Si3O8(OH)
Common Impurities:
Al,Fe,Mg,K,H2O

Chemical AnalysisHide

Oxide wt%:
 1
P2O50.01 %
SiO249.82 %
MnO38.99 %
MgO0.01 %
CaO0.62 %
SrO0.02 %
Na2O8.42 %
H2O (by stoichiometry)2.49 %
Total:100.38 %
Empirical formulas:
Sample IDEmpirical Formula
1(Na0.98Ca0.02)(Mn2+0.98Ca0.02)Mn2+1.00[Si2.99O8](OH)
Sample references:
IDLocalityReferenceNotes
1Woods Mine, Inglis Co., New South Wales, AustraliaBands of euhedral serandite crystals with contained rounded relict(?) grains of vittinkiite, accompanying natronambulite(?), in a matrix of abundant quartz, braunite and mangano-mangani-ungarettiite. The distribution of the minor Ca content is estimated based on site filling and has not been verified by structural analysis. H2O is calculated based on stoichiometry.

Crystallography of SeranditeHide

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Setting:
P1
Cell Parameters:
a = 7.683(1) Å, b = 6.889(1) Å, c = 6.747(1) Å
α = 90.53(5)°, β = 94.12(2)°, γ = 102.75(2)°
Ratio:
a:b:c = 1.115 : 1 : 0.979
Unit Cell V:
347.29 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Blocky prismatic to acicular crystals.
Twinning:
Around [010] composition plane {100}, less commonly contact twin on {110}.

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0000499SeranditeTakeuchi Y, Kudoh Y, Yamanaka T (1976) Crystal chemistry of the serandite-pectolite series and related minerals American Mineralogist 61 229-23719760293
0000623SeranditeOhashi Y, Finger L W (1978) The role of octahedral cations in pyroxenoid crystal chemistry. I. Bustamite, wollastonite, and the pectolite-schizolite-serandite series sample SRN, from Rouma, Island of Los, Guinea American Mineralogist 63 274-28819780293
0002430SeranditeJacobsen S D, Smyth J R, Swope R J, Sheldon R I (2000) Two proton positions in the very strong hydrogen bond of serandite, NaMn2[Si3O8(OH)] American Mineralogist 85 745-75220000293
0002431SeranditeJacobsen S D, Smyth J R, Swope R J, Sheldon R I (2000) Two proton positions in the very strong hydrogen bond of serandite, NaMn2[Si3O8(OH)] American Mineralogist 85 745-75220000293
0020402SeranditeWilliams E R, Weller M T (2014) A variable-temperature neutron diffraction study of serandite: A Mn-silicate framework with a very strong, two-proton site, hydrogen bond American Mineralogist 99 1755-17602014Mont St. Hilaire, Quebec, Canada04
0020403SeranditeWilliams E R, Weller M T (2014) A variable-temperature neutron diffraction study of serandite: A Mn-silicate framework with a very strong, two-proton site, hydrogen bond American Mineralogist 99 1755-17602014Mont St. Hilaire, Quebec, Canada0150
0020404SeranditeWilliams E R, Weller M T (2014) A variable-temperature neutron diffraction study of serandite: A Mn-silicate framework with a very strong, two-proton site, hydrogen bond American Mineralogist 99 1755-17602014Mont St. Hilaire, Quebec, Canada0298
0020405SeranditeWilliams E R, Weller M T (2014) A variable-temperature neutron diffraction study of serandite: A Mn-silicate framework with a very strong, two-proton site, hydrogen bond American Mineralogist 99 1755-17602014Mont St. Hilaire, Quebec, Canada0575
0020406SeranditeWilliams E R, Weller M T (2014) A variable-temperature neutron diffraction study of serandite: A Mn-silicate framework with a very strong, two-proton site, hydrogen bond American Mineralogist 99 1755-17602014Mont St. Hilaire, Quebec, Canada0800
0010758SeranditeTakeuchi Y, Kudoh Y, Haga N (1973) The interpretation of partial Patterson functions and its application to structure analyses of serandite Mn2NaHSi3O9 and banalsite BaNa2Al4Si4O16 Zeitschrift fur Kristallographie 138 313-3361973Tanohata mine, Japan0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
7.51 Å(25)
3.158 Å(90)
2.983 Å(100)
2.838 Å(65)
2.602 Å(35)
2.495 Å(45)
2.192 Å(60)
Comments:
ICDD 25-723

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
High-𝑇 alteration and/or metamorphism
32 : Ba/Mn/Pb/Zn deposits, including metamorphic deposits
Stage 4b: Highly evolved igneous rocks>3.0
35 : Ultra-alkali and agpaitic igneous rocks
Geological Setting:
In sodalite zenoliths and pegmatites, phonolite, contact metamorphic rocks.

Type Occurrence of SeranditeHide

General Appearance of Type Material:
Pink bladed mineral.
Place of Conservation of Type Material:
National Museum of Natural History (Smithsonian Institution), Washington, D.C., USA, number 96515.
Geological Setting of Type Material:
Alkalic pegmatite.
Associated Minerals at Type Locality:
Reference:
Lacroix, A. (1931) Les pegmatites de la syènite sodalitique de l'Îsle Rouma (Archipel de Los, Guinèe française). Desciption d'un nouveau minéral (sérandite) qu'elles renferment. Comptes Rendu, Academie des Sciences, Paris: 192(4): 187 194.

Other Language Names for SeranditeHide

German:Sérandit
Japanese:セラン石
Simplified Chinese:针钠锰石
桃针钠石
Spanish:Sérandita
Traditional Chinese:針鈉錳石
桃針鈉石

Varieties of SeranditeHide

Calcium-bearing SéranditeA variety of Sérandite especially rich in calcium. Most Sérandite contains some calcium.

Relationship of Serandite to other SpeciesHide

Other Members of this group:
Barrydawsonite-(Y)Na1.5Y0.5CaSi3O8(OH)Mon. 2/m : P21/b
BustamiteCaMn2+(Si2O6)Tric. 1 : P1
CascanditeCaScSi3O8(OH)Tric. 1
DalnegorskiteCa5Mn(Si3O9)2Tric. 1 : P1
FerrobustamiteCaFe2+(Si2O6)Tric. 1
MendigiteMn2Mn2MnCa(Si3O9)2Tric. 1 : P1
MurakamiiteLiCa2Si3O8(OH)Tric. 1 : P1
PectoliteNaCa2Si3O8(OH)Tric. 1 : P1
SchizoliteNaCaMnSi3O8(OH)Tric. 1 : P1
TanohataiteLiMn2Si3O8(OH)Tric. 1 : P1
VistepiteSnMn4B2Si4O16(OH)2Tric. 1 : P1
WollastoniteCa3(Si3O9)Tric. 1 : P1
Forms a series with:

Common AssociatesHide

Associated Minerals Based on Photo Data:
317 photos of Serandite associated with AegirineNaFe3+Si2O6
212 photos of Serandite associated with AnalcimeNa(AlSi2O6) · H2O
141 photos of Serandite associated with NatroliteNa2Al2Si3O10 · 2H2O
129 photos of Serandite associated with PolylithioniteKLi2Al(Si4O10)(F,OH)2
106 photos of Serandite associated with AlbiteNa(AlSi3O8)
65 photos of Serandite associated with ManganoneptuniteKNa2Li(Mn2+)2Ti2[Si4O12]2
60 photos of Serandite associated with LeucophaniteNaCaBeSi2O6F
53 photos of Serandite associated with MicroclineK(AlSi3O8)
53 photos of Serandite associated with RhodochrositeMnCO3
53 photos of Serandite associated with UssingiteNa2AlSi3O8OH

Related Minerals - Strunz-mindat GroupingHide

9.DG.CalcinaksiteKNaCa(Si4O10) · H2OTric. 1 : P1
9.DG.Barrydawsonite-(Y)Na1.5Y0.5CaSi3O8(OH)Mon. 2/m : P21/b
9.DG.ParatobermoriteCa4(Al0.5Si0.5)2Si4O16(OH)(H2O)2 · (Ca · 3H2O)Mon. 2/m
9.DG.AlvesiteNaKZrSi6O15 · 2H2OOrth. mmm (2/m 2/m 2/m)
9.DG.02SteedeiteNaMn2[Si3BO9](OH)2Tric. 1 : P1
9.DG.02NolzeiteNaMn2[Si3BO9](OH)2 · 2H2OTric. 1 : P1
9.DG.05BustamiteCaMn2+(Si2O6)Tric. 1 : P1
9.DG.05FerrobustamiteCaFe2+(Si2O6)Tric. 1
9.DG.05PectoliteNaCa2Si3O8(OH)Tric. 1 : P1
9.DG.05WollastoniteCa3(Si3O9)Tric. 1 : P1
9.DG.05Wollastonite-1ACaSiO3Tric. 1 : P1
9.DG.05TanohataiteLiMn2Si3O8(OH)Tric. 1 : P1
9.DG.05SchizoliteNaCaMnSi3O8(OH)Tric. 1 : P1
9.DG.05MurakamiiteLiCa2Si3O8(OH)Tric. 1 : P1
9.DG.05DalnegorskiteCa5Mn(Si3O9)2Tric. 1 : P1
9.DG.07CascanditeCaScSi3O8(OH)Tric. 1
9.DG.08Plombièrite[Ca4Si6O16(OH)2 · 2H2O] · (Ca · 5H2O)Orth.
9.DG.10Clinotobermorite[Ca4Si6O17 · 2H2O] · (Ca · 3H2O)Mon.
9.DG.10RiversideiteCa5(HSi3O9)2 · 2H2OOrth.
9.DG.10TobermoriteCa4Si6O17(H2O)2 · (Ca · 3H2O)Mon. 2 : P21
9.DG.12JusiteNa2Ca15Al4Si16O54 · 17H2O
9.DG.12KenotobermoriteCa4Si6O15(OH)2(H2O)2 · 3H2OMon.
9.DG.15FoshagiteCa4(Si3O9)(OH)2Tric. 1 : P1
9.DG.20JenniteCa9(Si3O9)2(OH)8 · 8H2OTric. 1 : P1
9.DG.20KameneviteK2TiSi3O9 · H2OOrth. 2 2 2 : P21 21 21
9.DG.25ParaumbiteK3Zr2H(Si3O9)2 · nH2OOrth. mm2
9.DG.25UmbiteK2(Zr,Ti)Si3O9 · H2OOrth. 2 2 2 : P21 21 21
9.DG.30SørenseniteNa4SnBe2Si6O16(OH)4Mon. 2/m : B2/b
9.DG.32Escheite Ca2NaMnTi5[Si12O34]O2(OH)3 · 12H2OOrth. mm2 : Ama2
9.DG.35XonotliteCa6(Si6O17)(OH)2Mon. 2/m : B2/m
9.DG.40HillebranditeCa2(SiO3)(OH)2Orth. mmm (2/m 2/m 2/m) : Cmcm
9.DG.45ZoriteNa8(Ti,Nb)5(Si6O17)2(OH,O)5 · 14H2OOrth.
9.DG.45ChivruaiiteCa4(Ti,Nb)5(Si6O17)2(OH,O)5 · 13-14H2OOrth. mmm (2/m 2/m 2/m) : Cmmm
9.DG.50Haineaultite(Na,Ca)5Ca(Ti,Nb)5(Si6O17)2(OH,F)8 · 5H2OOrth. 2 2 2 : C2 2 2
9.DG.55EpididymiteNa2Be2Si6O15 · H2OOrth. mmm (2/m 2/m 2/m) : Pnma
9.DG.60EudidymiteNa2Be2Si6O15 · H2OMon. 2/m : B2/b
9.DG.65ElpiditeNa2ZrSi6O15 · 3H2OOrth.
9.DG.65PatyniteNaKCa4[Si9O23]Tric. 1 : P1
9.DG.67WhelaniteCu2+2Ca6[Si6O17(OH)](CO3)(OH)3 · 2H2OOrth. mm2 : Pnn2
9.DG.70Fenaksite(K,Na)4(Fe,Mn)2(Si4O10)2(OH,F)Tric. 1 : P1
9.DG.70LitidioniteCuNaKSi4O10Tric. 1 : P1
9.DG.70ManaksiteKNaMnSi4O10Tric. 1 : P1
9.DG.70YusupoviteNa2Zr(Si6O15) · 2.5H2OMon. 2/m : B2/m
9.DG.70EnricofrancoiteKNaCaSi4O10Tric. 1 : P1
9.DG.75TinaksiteK2Na(Ca,Mn2+)2TiO[Si7O18(OH)]Tric.
9.DG.75TokkoiteK2Ca4[Si7O18(OH)](OH,F)Tric.
9.DG.75SenkevichiteCsKNaCa2TiO[Si7O18](OH)Tric. 1 : P1
9.DG.80CanasiteK3Na3Ca5Si12O30(OH)4Mon. m : Bm
9.DG.80FluorcanasiteK3Na3Ca5Si12O30F4 · H2OMon. m : Bm
9.DG.85MiseriteK1.5-x(Ca,Y,REE)5(Si6O15)(Si2O7)(OH,F)2 · yH2OTric.
9.DG.90FrankameniteK3Na3Ca5(Si12O30)(F,OH)4 · H2OTric. 1 : P1
9.DG.92Charoite(K,Sr)15-16(Ca,Na)32[Si6O11(O,OH)6]2[Si12O18(O,OH)12]2[Si17O25(O,OH)18]2(OH,F)4 · ~3H2OMon. 2/m : P21/m
9.DG.95YuksporiteK4(Ca,Na)14(Sr,Ba)2(◻,Mn,Fe)(Ti,Nb)4(O,OH)4(Si6O17)2(Si2O7)3(H2O,OH)3Mon. 2/m : P21/m
9.DG.97Eveslogite(Na,K,Ca,Sr,Ba)48 [(Ti,Nb,Mn,Fe2+)12Si48O144(OH)12](F,OH,Cl)14Mon. 2/m : P2/m

Fluorescence of SeranditeHide

Not fluorescent in UV

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.

Internet Links for SeranditeHide

References for SeranditeHide

Reference List:

Localities for SeranditeHide

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 references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Australia
 
  • New South Wales
    • Forbes Co.
      • Grenfell
Mandarino (1996) +1 other reference
    • Inglis Co.
Kawachi et al. (1996)
  • Queensland
    • Somerset Region
Carr
Brazil
 
  • Mato Grosso do Sul
    • Corumbá
      • Urucum massif
Biondi et al. (2020)
  • Minas Gerais
    • Poços de Caldas
Azzi (2019)
Azzi (2019)
  • Santa Catarina
1995 +1 other reference
Canada
 
  • Québec
    • Montérégie
      • La Vallée-du-Richelieu RCM
        • Mont Saint-Hilaire
166-175. +3 other references
      • Lajemmerais RCM
        • Varennes & St-Amable
Horváth et al. (1998)
Horváth et al. (1998)
Guinea
 
  • Conakry Region
Biagioni et al. (2012)
a magmatic marker of the evolution of the Central and Equatorial Atlantic. The Canadian Mineralogist (2) +2 other references
Hungary
 
  • Baranya County
    • Pécs District
      • Hosszúhetény
collector: Csaba Papp
www.geomania.hu
India
 
  • West Bengal
    • Purulia District
Chakrabarty et al. (2013) +1 other reference
Italy
 
  • Liguria
    • La Spezia Province
      • Borghetto di Vara
Palenzona et al. (1990)
  • Tuscany
    • Lucca Province
      • Vagli Sotto
Biagioni (2004)
Japan
 
  • Akita Prefecture
    • Odate
Dr. Wilfried Steffens: "The Eudialyte Homepage" www.koeln.netsurf.de/~w.steffens/other.htm (where it is erroneously assumed to be related to alkaline igneous rocks)
  • Iwate Prefecture
    • Shimohei District
      • Tanohata
Am Min 61:3-4 pp 229-237 +2 other references
Matsubara et al. (2010)
  • Tokyo Metropolis
    • Nishitama district
      • Okutama-cho
Matsubara et al. (2004) +1 other reference
Mexico
 
  • Oaxaca
    • Ayoquezco de Aldama
www.mineral-forum.com (n.d.)
Namibia
 
  • Khomas Region
    • Windhoek Rural
      • Aris
Prof. Friedrich Koller (chemical analyses on thin sections) +3 other references
  • Otjozondjupa Region
    • Otavi Constituency
      • Kombat
Dunn (1991)
Norway
 
  • Telemark
    • Porsgrunn
      • Auenlandet
        • Sagåsen
Larsen et al. (2010)
      • Bjørkedalen
Andersen et al. (1996)
  • Vestfold
    • Larvik
      • Vesle Arøya
Engvoldsen et al. (1991) +1 other reference
Russia
 
  • Murmansk Oblast
    • Khibiny Massif
Pekov et al. (2004)
Pekov (1998)
    • Lovozersky District
Pekov (1998) +1 other reference
        • Umbozero mine
Lapis +1 other reference
V. Grishin collection
Pekov et al. (2001)
Pekov (1998) +3 other references
        • Karnasurt mine
Pekov et al. (2003) +1 other reference
Pekov (1998)
Pekov (1998) +1 other reference
Yakovenchuk et al. (2011)
Pekov et al. (2013)
      • Sengischorr Mountain
        • Motchisuai River Valley
Pekov (1998)
South Africa
 
  • North West
    • Bojanala Platinum District Municipality
      • Moses Kotane Local Municipality
Mitchell et al. (2004)
  • Northern Cape
    • John Taolo Gaetsewe District Municipality
      • Gamagara Local Municipality
Moore et al. (2011) +2 other references
      • Joe Morolong Local Municipality
Von Bezing (1991)
    • ZF Mgcawu District Municipality
      • Tsantsabane Local Municipality
Costin et al. (2014)
Sweden
 
  • Värmland County
    • Filipstad
      • Långban Ore District
Holtstam et al. (2019)
Ukraine
 
  • Donetsk Oblast
    • Azov Sea Region
Sharygin (2015)
USA
 
  • Arkansas
Howard (2007)
      • Little Rock
Rocks and Minerals (1988) +1 other reference
Henry Barwood - unpublished (2010)
  • California
    • San Benito County
      • Santa Rita Peak
Van Nostrand Reinholt Press: 410. +2 other references
  • New Mexico
    • Colfax County
      • Springer
        • Point of Rocks Mesa (Pecks Mesa)
Rocks & Min.:60:229.
 
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