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Windmountainite

A valid IMA mineral species
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01925420017102734216056.jpg
Windmountainite

Aris Quarries, Aris, Windhoek Rural, Khomas Region, Namibia
08659530017102734217711.jpg
Windmountainite, etc.

Wind Mountain, Cornudas Mountains, Otero County, New Mexico, USA
00718420017102734222944.jpg
Windmountainite, etc.

Wind Mountain, Cornudas Mountains, Otero County, New Mexico, USA
04923560017055302108258.jpg
Windmountainite

Aris Quarries, Aris, Windhoek Rural, Khomas Region, Namibia
03230800017057007229609.jpg
Windmountainite, etc.

Wind Mountain, Cornudas Mountains, Otero County, New Mexico, USA
04871640017057510813587.jpg
Windmountainite, etc.

Wind Mountain, Cornudas Mountains, Otero County, New Mexico, USA
01925420017102734216056.jpg
Windmountainite

Aris Quarries, Aris, Windhoek Rural, Khomas Region, Namibia
07817060017057510797589.jpg
Windmountainite, etc.

Wind Mountain, Cornudas Mountains, Otero County, New Mexico, USA
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About WindmountainiteHide

08959910014977209469698.jpg
Wind Mountain, New Mexico

Wind Mountain, Cornudas Mountains, Otero County, New Mexico, USA
Formula:
◻Fe3+2Mg2◻2Si8O20(OH)2(H2O)4 · 4H2O
Colour:
Orange-brown
Lustre:
Silky, Dull
Hardness:
2
Specific Gravity:
2.51 (Calculated)
Crystal System:
Monoclinic
Name:
Named for Wind Mountain, New Mexico, USA, the type locality.
"Associated minerals include albite, aegirine, fluorapophyllite-(K), natrolite, neotocite, and montmorillonite, the last of these being observed to replace primary windmountainite. It has a dull luster, silky in aggregates, is translucent and has an orange-brown streak. It does not fluoresce under short-, medium-, or long-wave ultraviolet radiation." (Leung & McDonald, 2020).


Unique IdentifiersHide

Mindat ID:
53877
Long-form identifier:
mindat:1:1:53877:6
GUID
(UUID V4):
bda38fe4-f1cf-4491-b4d4-ce8d409feec9

IMA Classification of WindmountainiteHide

Classification of WindmountainiteHide

Strunz-mindat (2024):
9.EE.20

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

Mineral SymbolsHide

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

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

Physical Properties of WindmountainiteHide

Lustre:
Silky, Dull
Transparency:
Translucent
Comment:
Silky in aggregates
Colour:
Orange-brown
Streak:
Orange-brown
Hardness:
2 on Mohs scale
Hardness Data:
Estimated
Tenacity:
Brittle
Cleavage:
Distinct/Good
Two good cleavages (predicted) on {110}
Fracture:
Splintery
Density:
2.51 g/cm3 (Calculated)

Chemistry of WindmountainiteHide

Mindat Formula:
◻Fe3+2Mg2◻2Si8O20(OH)2(H2O)4 · 4H2O
Elements listed:
Fe, H, Mg, O, Si - search for minerals with similar chemistry

Crystallography of WindmountainiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Setting:
C2/m
Cell Parameters:
a = 13.759(3) Å, b = 17.911(4) Å, c = 5.274(1) Å
β = 106.44(3)°
Ratio:
a:b:c = 0.768 : 1 : 0.294
Unit Cell V:
1,246.57 ų (Calculated from Unit Cell)
Morphology:
Acicular to bladed crystals, elongate on [001] and flattened on the pinacoid {010}.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
10.592 Å(100)
5.453 Å(16)
4.484 Å(19)
4.173 Å(28)
3.319 Å(53)
3.271 Å(13)
2.652 Å(30)
2.530 Å(27)

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 4b: Highly evolved igneous rocks>3.0
35 : Ultra-alkali and agpaitic igneous rocks

Type Occurrence of WindmountainiteHide

Type Locality:
ⓘ Wind Mountain, Cornudas Mountains, Otero County, New Mexico, USA
General Appearance of Type Material:
Orange-brown, radiating aggregates. Tightly bound bundles (up to 0.02 × 6 mm) of acicular to bladed crystals.
Place of Conservation of Type Material:
Type material is deposited in the mineralogical collections of the Canadian Museum of Nature, P.O. Box 3443, Station D, Ottawa, Ontario K1P 6P4, Canada, catalogue number CMNMC 87260
Geological Setting of Type Material:
Phonolite dike
Associated Minerals at Type Locality:
NeotociteNatroliteMontmorilloniteFluorapophyllite-(K)Albite
Aegirine
Reference:
Leung, D.D., McDonald, A.M. (2020) Windmountainite, □Fe3+2Mg2□2Si8O20(OH)2(H2O)4•4H2O, a new modulated, layered Fe3+-Mg-silicate-hydrate from Wind Mountain, New Mexico: Characterization and origin, with comments on the classification of palygorskite-group minerals. The Canadian Mineralogist: 58(4): 477-509.

Synonyms of WindmountainiteHide

Relationship of Windmountainite to other SpeciesHide

Member of:
Palygorskite Group
Other Members of this group:
Palygorskite◻Al2Mg2◻2Si8O20(OH)2(H2O)4 · 4H2OMon. 2/m : B2/m
RaiteMn2+Mn2+2Na2(◻1.75Ti0.25)Si8O20(OH)2(H2O)4 · Na(H2O)6Orth. 2 2 2 : C2 2 2
TuperssuatsiaiteFe3+Fe3+2(Na◻)◻2Si8O20(OH)2(H2O)4 · 2H2OMon. 2/m : B2/m
Unnamed (Na-Ca-Fe-Silicate-Hydrate)NaCa(Fe2+,Al,Mn)5[Si8O19(OH)](OH)7 · 5H2OTric. 1 : P1
WindhoekiteFe3+(Fe3+1.67◻0.33)Ca2◻2Si8O20(OH)2(H2O)4(OH)2 · 6H2OMon. 2/m : B2/m
YofortieriteMn2+Mn2+2Mn2+2◻2Si8O20(OH)2(H2O)4 · 4H2OMon. 2/m : B2/m

Common AssociatesHide

Associated Minerals Based on Photo Data:
1 photo of Windmountainite associated with Chabazite
1 photo of Windmountainite associated with NatroliteNa2Al2Si3O10 · 2H2O

Related Minerals - Strunz-mindat GroupingHide

9.EE.CairncrossiteSr2Ca7-xNa2x(Si4O10)4(OH)2(H2O)15-xTric. 1 : P1
9.EE.05BementiteMn7Si6O15(OH)8Mon.
9.EE.07InnsbruckiteMn33(Si2O5)14(OH)38Mon. m : Bm
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. 3m (3 2/m) : P3m1
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]Trig. 3m (3 2/m) : R3m
9.EE.15SchalleriteMn2+16As3Si12O36(OH)17Trig. 3m : P3m1
9.EE.20Palygorskite◻Al2Mg2◻2Si8O20(OH)2(H2O)4 · 4H2OMon. 2/m : B2/m
9.EE.20TuperssuatsiaiteFe3+Fe3+2(Na◻)◻2Si8O20(OH)2(H2O)4 · 2H2OMon. 2/m : B2/m
9.EE.20YofortieriteMn2+Mn2+2Mn2+2◻2Si8O20(OH)2(H2O)4 · 4H2OMon. 2/m : B2/m
9.EE.20WindhoekiteFe3+(Fe3+1.67◻0.33)Ca2◻2Si8O20(OH)2(H2O)4(OH)2 · 6H2OMon. 2/m : B2/m
9.EE.20Unnamed (Na-Ca-Fe-Silicate-Hydrate)NaCa(Fe2+,Al,Mn)5[Si8O19(OH)](OH)7 · 5H2OTric. 1 : P1
9.EE.25Falcondoite(Ni,Mg)4Si6O15(OH)2 · 6H2OOrth.
9.EE.25LoughliniteNa2Mg3Si6O16 · 8H2OOrth. mmm (2/m 2/m 2/m)
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. 1 : P1
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. 3 : P3
9.EE.35Truscottite(Ca,Mn)14Si24O58(OH)8 · 2H2OTrig.
9.EE.35KodamaiteNa3(Ca5Na)Si16O36(OH)4F2 · (14-x)H2O Tric. 1 : P1
9.EE.40NatrosiliteNa2Si2O5Mon. 2/m : P21/b
9.EE.45MakatiteNa2Si4O8(OH)2 · 4H2OMon. 2/m : P21/b
9.EE.50VarennesiteNa8Mn2Si10O25(OH,Cl)2 · 12H2OOrth. mmm (2/m 2/m 2/m) : Cmcm
9.EE.55RaiteMn2+Mn2+2Na2(◻1.75Ti0.25)Si8O20(OH)2(H2O)4 · Na(H2O)6Orth. 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. 3m : P3 1c
9.EE.65ZakharoviteNa4Mn5Si10O24(OH)6 · 6H2OTrig. 3m
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.80EllingseniteNa5Ca6Si18O38(OH)13 · 6H2OTric. 1 : P1
9.EE.85Lalondeite(Na,Ca)6(Ca,Na)3Si16O38(F,OH)2 · 3H2OTric. 1 : P1

Fluorescence of WindmountainiteHide

In UV light:
Does not fluoresce

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 WindmountainiteHide

References for WindmountainiteHide

Localities for WindmountainiteHide

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.
Namibia
 
  • Khomas Region
    • Windhoek Rural
      • Aris
EDS analysis shows atom percent Mg ...
USA (TL)
 
  • New Mexico
    • Otero County
      • Cornudas Mountains
Miyawaki et al. (2019) +1 other reference
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