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Holtite

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Harold Edward Holt
Formula:
(Ta0.60.4)Al6BSi3O18(O,OH)2.25
Originally assumed to be Al6(Al,Ta)(SiO4,SbO4,AsO4)3(BO3)O3.
Colour:
Light buff to cream-buff, deep olive-buff, brown, russet
Lustre:
Vitreous, Resinous, Dull
Hardness:
Specific Gravity:
3.60 - 3.90
Crystal System:
Orthorhombic
Name:
After Harold Edward Holt [August 5, 1908 - December 17, 1967], Prime Minister of Australia (1966-1967).
Note: Groat et al. (2008) give the formula (Ta,◻,Al)Al6(BO3)(Si,Sb,As)3O12(O,OH,◻)3.

Closely related to dumortierite.


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Classification of HoltiteHide

Approved
9.AJ.10

9 : SILICATES (Germanates)
A : Nesosilicates
J : Nesosilicates with BO3 triangles and/or B[4], Be[4] tetrahedra, cornersharing with SiO4
54.1.3.1

54 : NESOSILICATES Borosilicates and Some Beryllosilicates
1 : Borosilicates and Some Beryllosilicates with (BO3)
17.5.26

17 : Silicates Containing other Anions
5 : Borosilicates

Pronounciation of HoltiteHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of HoltiteHide

Vitreous, Resinous, Dull
Transparency:
Translucent
Comment:
Dull when weathered
Colour:
Light buff to cream-buff, deep olive-buff, brown, russet
Streak:
Light buff
Hardness:
8½ on Mohs scale
Cleavage:
Distinct/Good
Good on {001}, may be parting
Density:
3.60 - 3.90 g/cm3 (Measured)    

Optical Data of HoltiteHide

Type:
Biaxial (-)
RI values:
nα = 1.705 - 1.746 nβ = 1.728 - 1.759 nγ = 1.730 - 1.761
2V:
Measured: 20° to 55°, Calculated: 32° to 42°
Max Birefringence:
δ = 0.025
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
r < v
Pleochroism:
Visible
Comments:
Various shades of yellow to colorless

Chemical Properties of HoltiteHide

Formula:
(Ta0.60.4)Al6BSi3O18(O,OH)2.25

Originally assumed to be Al6(Al,Ta)(SiO4,SbO4,AsO4)3(BO3)O3.
IMA Formula:
(Ta0.60.4)Al6BSi3O18
Common Impurities:
Ti,Fe,As,Nb,Mn,Be,Mg,Ca,Li,Na,K,Rb,Cs

Crystallography of HoltiteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pnma
Setting:
Pnma
Cell Parameters:
a = 4.6914(5) Å, b = 11.896(2) Å, c = 20.383(4) Å
Ratio:
a:b:c = 0.394 : 1 : 1.713
Unit Cell V:
1,137.55 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Blocky crystals, pseudohexagonal needles
Twinning:
Multiple on {011}

Type Occurrence of HoltiteHide

Synonyms of HoltiteHide

Other Language Names for HoltiteHide

German:Holtit
Russian:Холтит
Spanish:Holtita

Relationship of Holtite to other SpeciesHide

Other Members of this group:
Nioboholtite(Nb0.60.4)Al6BSi3O18Orth. mmm (2/m 2/m 2/m) : Pbcm
Titanoholtite(Ti0.750.25)Al6BSi3O18Orth. mmm (2/m 2/m 2/m) : Pbcm

Common AssociatesHide

Microlite GroupTa-dominant members of the Pyrochlore Supergroup.
StibiotantaliteSb(Ta,Nb)O4
Associated Minerals Based on Photo Data:
Elbaite5 photos of Holtite associated with Elbaite on mindat.org.
Quartz5 photos of Holtite associated with Quartz on mindat.org.
Albite2 photos of Holtite associated with Albite on mindat.org.
Nioboholtite1 photo of Holtite associated with Nioboholtite on mindat.org.
Titanoholtite1 photo of Holtite associated with Titanoholtite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.AJ.05Grandidierite(Mg,Fe2+)(Al,Fe3+)3(SiO4)(BO3)O2Orth. mmm (2/m 2/m 2/m)
9.AJ.05Ominelite(Fe2+,Mg)(Al,Fe3+)3(SiO4)(BO3)O2Orth. mmm (2/m 2/m 2/m)
9.AJ.10Dumortierite(Al,Fe3+)7(SiO4)3(BO3)O3Orth. mmm (2/m 2/m 2/m)
9.AJ.10Magnesiodumortierite(Mg,Ti,◻(Al,Mg)2Al4Si3O18-y(OH)yB y = 2-3Orth.
9.AJ.15GarrelsiteBa3NaSi2B7O16(OH)4Mon.
9.AJ.20BakeriteCa4(H5B5Si3O20)Mon. 2/m : P21/b
9.AJ.20DatoliteCa(HBSiO5)Mon. 2/m : P21/b
9.AJ.20Gadolinite-(Ce)(Ce,La,Nd,Y)2Fe2+Be2Si2O10Mon. 2/m
9.AJ.20Gadolinite-(Y)Y2Fe2+Be2Si2O10Mon. 2/m : P21/b
9.AJ.20Hingganite-(Ce)(Ce,REE)2(□,Fe2+)Be2[SiO4]2(OH)2Mon. 2/m : P21/b
9.AJ.20Hingganite-(Y)(Y,REE,Ca)2(□,Fe2+)Be2[SiO4]2(OH)2Mon. 2/m : P21/b
9.AJ.20Hingganite-(Yb)(Yb,Y,REE)2□Be2[SiO4]2(OH)2
9.AJ.20HomiliteCa2(Fe2+,Mg)B2Si2O10Mon.
9.AJ.20Melanocerite-(Ce)(Ce,Ca)5(SiO4,BO4)3(OH,0)Hex.
9.AJ.20Minasgeraisite-(Y)CaBe2Y2Si2O10Mon. 2/m : P21/b
9.AJ.20Calcybeborosilite-(Y)(Y,Ca)2(□,Fe2+)(B,Be)2[SiO4]2(OH,O)2Mon.
9.AJ.25Stillwellite-(Ce)(Ce,La,Ca)BSiO5
9.AJ.30Cappelenite-(Y)Ba(Y,Ce)6Si3B6O24F2Trig. 3 : P3
9.AJ.35Okanoganite-(Y)(Na,Ca)3(Y,Ce)12Si6B2O27F14
9.AJ.35Vicanite-(Ce)(Ca,Ce,La,Th)15As5+(As3+0.5,Na0.5)Fe3+Si6B4O40F7Trig.
9.AJ.35Hundholmenite-(Y)(Y,REE,Ca,Na)15(Al,Fe3+)(CaxAs3+1-x)(Si,As5+)Si6B3(O,F)48Trig. 3m : R3m
9.AJ.35Proshchenkoite-(Y)Ca(Y,REE,Ca,Na,Mn)15Fe2+(P,Si)Si6B3O34F14Trig. 3m : R3m
9.AJ.40JadariteLiNaSiB3O7(OH)Mon. 2/m

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

17.5.1ManandoniteLi2Al4(Si2AlB)O10(OH)8Orth.
17.5.2ReedmergneriteNaBSi3O8Tric.
17.5.3SearlesiteNa(H2BSi2O7)Mon. 2 : P21
17.5.4OleniteNa(Al3)Al6(Si6O18)(BO3)3O3(OH)Trig.
17.5.5ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
17.5.6KalborsiteK6Al4BSi6O20(OH)4ClTet.
17.5.7BoromuscoviteKAl2(BSi3O10)(OH)2Mon.
17.5.8PoudretteiteKNa2B3Si12O30Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
17.5.9LiddicoatiteCa(Li2Al)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
17.5.10DatoliteCa(HBSiO5)Mon. 2/m : P21/b
17.5.11DanburiteCaB2Si2O8Orth. mmm (2/m 2/m 2/m)
17.5.12HowliteCa2B5SiO9(OH)5Mon. 2/m : P21/b
17.5.13BakeriteCa4(H5B5Si3O20)Mon. 2/m : P21/b
17.5.14OyeliteCa10Si8B2O29 · 12.5H2OOrth.
17.5.15KornerupineMg3Al6(Si,Al,B)5O21(OH)Orth. mmm (2/m 2/m 2/m)
17.5.16HarkeriteCa12Mg4Al(BO3)3(SiO4)4(CO3)5 · H2OTrig. 3m (3 2/m) : R3m
17.5.17SerendibiteCa4[Mg6Al6]O4[Si6B3Al3O36]Tric. 1 : P1
17.5.18Stillwellite-(Ce)(Ce,La,Ca)BSiO5
17.5.19Tadzhikite-(Ce)Ca4Ce3+2Ti◻(B4Si4O22)(OH)2Mon.
17.5.20Melanocerite-(Ce)(Ce,Ca)5(SiO4,BO4)3(OH,0)Hex.
17.5.21Okanoganite-(Y)(Na,Ca)3(Y,Ce)12Si6B2O27F14
17.5.22Tritomite-(Ce)Ce5(SiO4,BO4)3(OH,O)
17.5.23Tritomite-(Y)Y5(SiO4,BO4)3(O,OH,F)
17.5.24Cappelenite-(Y)Ba(Y,Ce)6Si3B6O24F2Trig. 3 : P3
17.5.25Dumortierite(Al,Fe3+)7(SiO4)3(BO3)O3Orth. mmm (2/m 2/m 2/m)
17.5.27DraviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
17.5.28 FerridraviteNaFe3+3(Mg2Fe3+4)(Si6O18)(BO3)3(OH)3O
17.5.29Axinite-(Mg)Ca2MgAl2BSi4O15OHTric.
17.5.30Uvite SeriesCa(Mg3)MgAl5(Si6O18)(BO3)3(OH)3(F/OH)Trig. 3m : R3m
17.5.31GarrelsiteBa3NaSi2B7O16(OH)4Mon.
17.5.32TienshaniteKNa3Na6Ca2Ba6Mn6(Ti4+,Nb)6B12Si36O114(O,OH,F)11Hex. 6/m : P6/m
17.5.33LeucospheniteBaNa4Ti2B2Si10O30Mon.
17.5.34TaramelliteBa4(Fe3+,Ti,Fe2+,Mg)4(B2Si8O27)O2ClxOrth. mmm (2/m 2/m 2/m) : Pmmn
17.5.35TitantaramelliteBa4(Ti,Fe3+,Fe2+,Mg)4(B2Si8O27)O2ClxOrth.
17.5.36NagashimaliteBa4(V,Ti)4B2Si8O27(O,OH)2ClOrth. mmm (2/m 2/m 2/m) : Pmmn
17.5.37Chromium-draviteNa(Mg3)Cr3+6(Si6O18)(BO3)3(OH)3(OH)Trig.
17.5.38WawayandaiteCa6Mn2BBe9Si6O23(OH,Cl)15Mon.
17.5.39Werdingite(Mg,Fe)2Al14Si4B4O37Tric.
17.5.40Axinite-(Mn)Ca2Mn2+Al2BSi4O15(OH)Tric. 1 : P1
17.5.41AxiniteTric.
17.5.42TinzeniteCa2Mn2+4Al4[B2Si8O30](OH)2Tric.
17.5.44SchorlNa(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
17.5.45Fluor-buergeriteNa(Fe3+3)Al6(Si6O18)(BO3)3O3FTrig. 3m : R3m
17.5.46FeruviteCa(Fe2+)3MgAl5(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
17.5.47Axinite-(Fe)Ca2Fe2+Al2BSi4O15OHTric. 1 : P1
17.5.48HomiliteCa2(Fe2+,Mg)B2Si2O10Mon.
17.5.49Grandidierite(Mg,Fe2+)(Al,Fe3+)3(SiO4)(BO3)O2Orth. mmm (2/m 2/m 2/m)
17.5.50Hyalotekite(Pb,Ba,K)4(Ca,Y)2(B,Be)2(Si,B)2Si8O28(F,Cl)Tric. 1 : P1
17.5.51Hellandite-(Y)(Ca,REE)4Y2Al◻2(B4Si4O22) (OH)2Mon.

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 HoltiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Pryce, M.W. (1971) Holtite: a new mineral allied to dumortierite. Mineralogical Magazine: 38: 21-25.
American Mineralogist (1972): 57: 1556 (abstract).
Voloshin, A.V., V.V. Gordienko, E.M. Gel'man, M.L. Zorina, N.A. Elina, E.A. Kul'chitskaya, Y.P. Men'shikov, L.I. Polezhaeva, R.I. Ryzhova, P.B. Sokolov, and G.I. Utochkina (1977) Holtite (first find in the USSR) and its interaction with other tantalum minerals in rare metal pegmatites. Zap. Vses. Mineral. Obshch., 106, 337-347 (in Russian).
Hoskins, B.F., W.G. Mumme, and M.W. Pryce (1989) Holtite, (Si2.25Sb0.75)B[Al6(Al0.43Ta0.270.30)O15(O,OH)2.25]: crystal structure and crystal chemistry. Mineralogical Magazine: 53: 457-463.
American Mineralogist (1990): 75: 937.
Grew, E.S., and Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).
Kazantsev, S.S., Pushcharovsky, D.Yu., Pasero, M., Merlino, S., Zubkova, N.V., Kabalov, Yu.K., Voloshin, A.V. (2005): Crystal structure of holtite I. Crystallography Reports: 50, 42-47.
Zubkova, N.; Pushcharovski, D.; Kabalov, Yu.; Kazantsev, S.; Voloshin, A. (2006): Crystal structure of holtite II. Crystallography Reports, 51, 16-22.
Groat, L.A. et al. (2008): Ordering in the crystal structure of holtite. Goldschmidt Conference Abstracts, A330. [http://www.goldschmidt2008.org/abstracts/finalPDFs/A330.pdf]
Pieczka, A.; Grew, E.S.; Groat, L.A.; Evans, R.J. (2011): Holtite and dumortierite from the Szklary Pegmatite, Lower Silesia, Poland. Mineralogical Magazine 75, 303-315.

Internet Links for HoltiteHide

Localities for HoltiteHide

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.
Argentina
 
  • San Luis
    • Coronel Pringles department
      • El Trapiche
        • Las Águilas deposit
Miguel Á. Galliski, María Florencia Márquez-Zavalía, Raúl Lira, Jan Cempírek and Radek Škoda (2012) Mineralogy and Origin of the Dumortierite-Bearing Pegmatites of Virorco, San Luis, Argentina. Canadian Mineralogist 50:873-894.
Australia
 
  • Western Australia
    • Bridgetown-Greenbushes Shire
      • Greenbushes Tinfield
Jacobson, M., Calderwood, M., Grguric, B.(2007): Pegmatites of Western Australia
MM 1971, 21-5
Poland
 
  • Lower Silesia (Dolnośląskie)
    • Ząbkowice District
      • Ząbkowice (Frankenstein)
        • Szklary (Gläsendorf)
Pieczka, A., & Gołębiowska, B. (2001). Altered pyrochlore from the Szklary rare-element pegmatite, Lower Silesia, Poland. In Mineral Deposits at the Beginning of the 21 st Century. Proceedings of the Joint sixth Biennial SGA-SEG Meeting (pp. 469-472).
Geologia Sudetica, 33 (1): 23-31. ; Pieczka, A.; Grew, E.S.; Groat, L.A.; Evans, R.J. (2011): Holtite and dumortierite from the Szklary Pegmatite, Lower Silesia, Poland. Mineralogical Magazine 75, 303-315.
Russia
 
  • Northern Region
    • Murmanskaya Oblast'
      • Voron'i Tundry
Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
Mineral and/or Locality  
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