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Falcondoite

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About FalcondoiteHide

Formula:
(Ni,Mg)4Si6O15(OH)2 · 6H2O
Colour:
whitish-green
Lustre:
Resinous
Hardness:
2 - 3
Specific Gravity:
1.9
Crystal System:
Orthorhombic
Member of:
Name:
Named after the mining company Falconbridge Dominicana C por A. (Falcondo), which mines at the type locality.
A nickel silicate forming friable masses of minute fibers, less than 10 microns in length.
The Ni analogue of sepiolite.


Classification of FalcondoiteHide

Approved
Approval Year:
1976
9.EE.25

9 : SILICATES (Germanates)
E : Phyllosilicates
E : Single tetrahedral nets of 6-membered rings connected by octahedral nets or octahedral bands
74.3.1b.2

74 : PHYLLOSILICATES Modulated Layers
3 : Modulated Layers with joined strips
14.26.6

14 : Silicates not Containing Aluminum
26 : Silicates of Ni

Physical Properties of FalcondoiteHide

Resinous
Transparency:
Translucent
Colour:
whitish-green
Hardness:
2 - 3 on Mohs scale
Tenacity:
Brittle
Density:
1.9 g/cm3 (Measured)    2.54 g/cm3 (Calculated)

Optical Data of FalcondoiteHide

Type:
Biaxial
Dispersion:
r < v strong

Chemical Properties of FalcondoiteHide

Formula:
(Ni,Mg)4Si6O15(OH)2 · 6H2O
IMA Formula:
Ni4Si6O15(OH)2 · 6H2O
Common Impurities:
Al,Cr,Fe

Crystallography of FalcondoiteHide

Crystal System:
Orthorhombic
Cell Parameters:
a = 13.5 Å, b = 26.9 Å, c = 5.24 Å
Ratio:
a:b:c = 0.502 : 1 : 0.195
Unit Cell V:
1902.91 ų
Z:
4

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
12.2 Å(100)
3.33 Å(30)
3.19 Å(25)
2.62 Å(30)
2.58 Å(35)
2.44 Å(30)
2.39 Å(20)

Type Occurrence of FalcondoiteHide

Place of Conservation of Type Material:
Royal Ontarion Museum, Toronto, Ontario, Canada
Geological Setting of Type Material:
In garnierite veins cutting a laterite, associated with a serpentinized harzbergite massif

Synonyms of FalcondoiteHide

Other Language Names for FalcondoiteHide

German:Falcondoit
Spanish:Falcondoita

Relationship of Falcondoite to other SpeciesHide

Member of:
Other Members of this group:
Ferrisepiolite(Fe3+,Fe2+,Mg)4((Si,Fe3+)6O15)(O,OH)2 · 6H2OOrth. mmm (2/m 2/m 2/m)
LoughliniteNa2Mg3Si6O16 · 8H2OOrth.
SepioliteMg4(Si6O15)(OH)2 · 6H2OOrth. mmm (2/m 2/m 2/m) : Pnna

Common AssociatesHide

Associated Minerals Based on Photo Data:
5 photos of Falcondoite associated with WillemseiteNi3Si4O10(OH)2
1 photo of Falcondoite associated with NullaginiteNi2(CO3)(OH)2
1 photo of Falcondoite associated with AntigoriteMg3(Si2O5)(OH)4

Related Minerals - Nickel-Strunz GroupingHide

9.EE.CairncrossiteSr2Ca7–xNa2x(Si4O10)4(OH)2(H2O)15–x (with 0 <= x <= 1)Tric. 1 : P1
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.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.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.35Truscottite(Ca,Mn)14Si24O58(OH)8 · 2H2OTrig.
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.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.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

74.3.1b.1SepioliteMg4(Si6O15)(OH)2 · 6H2OOrth. mmm (2/m 2/m 2/m) : Pnna
74.3.1b.3LoughliniteNa2Mg3Si6O16 · 8H2OOrth.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.26.1Liebenbergite(Ni,Mg)2SiO4Orth.
14.26.2PecoraiteNi3(Si2O5)(OH)4Mon.
14.26.3Népouite(Ni,Mg)3(Si2O5)(OH)4Orth.
14.26.4WillemseiteNi3Si4O10(OH)2Mon.
14.26.5Karpinskite(Ni,Mg)2Si2O5(OH)2 (?)Mon.

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 FalcondoiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Springer, G. (1976): Falcondoite, nickel analogue of sepiolite. The Canadian Mineralogist, 14, 407-409.

Internet Links for FalcondoiteHide

Localities for FalcondoiteHide

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.
Australia
 
  • Tasmania
    • Waratah-Wynyard municipality
      • Heazlewood district
Bottrill, R. S. & Baker, W.E. (2008): A Catalogue of The Minerals of Tasmania. Tasmanian Gelogical Survey Bulletin 73, 254 p
Dominican Republic
 
  • La Vega Province
    • Bonao
Villanova-de-Benavent, C., Proenza, J. A., Galí, S., Nieto, F., García-Casco, A., Roqué-Rosell, J., ... & Lewis, J. F. (2014). Mineralogy of Niphyllosilicates in the Falcondo Nilaterite deposit (Dominican Republic): A multiscale approach. In Proceedings ot the twenty first meeting of the International Mineralogical Association IMA (Vol. 298).
  • Monseñor Nouel Province
    • Bonao
Springer, G. (1976): Falcondoite, nickel analogue of sepiolite. The Canadian Mineralogist, 14, 407-409.
Indonesia
 
  • South Sulawesi Province
    • Sorowako (Soroako)
Sufriadin, S. (2012). Thermal and Infrared Studies of Garnierite from the Soroako Nickeliferous Laterite Deposit, Sulawesi, Indonesia. Indonesian Journal of Geology, 7(2).
 
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