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About LacroixiteHide

Alfred Lacroix at his desk
Colourless, light yellow, light green, almost white; colourless in transmitted light.
Sub-Vitreous, Resinous, Dull
Specific Gravity:
3.126 - 3.29
Crystal System:
Member of:
Named in 1914 by František Slavik in honor of Antoine François Alfred Lacroix [February 4, 1863, Macon, Saône-et-Loire, France - March 12, 1948, Paris, France], a French mineralogist.
Frequently occurs as grains and rods in the altered margins of blocky crystals and grains of amblygonite or montebrasite embedded in granite pegmatite matrix. Not usually found in montebrasite crystals extending into cavities. Pure grains of lacroixite are uncommon.

Classification of LacroixiteHide

Approved, 'Grandfathered' (first described prior to 1959)

B : Phosphates, etc., with additional anions, without H2O
H : With medium-sized and large cations, (OH,etc.):RO4 = 1:1

5 : (AB)2(XO4)Zq

22 : Phosphates, Arsenates or Vanadates with other Anions
1 : Phosphates, arsenates or vanadates with fluoride

Physical Properties of LacroixiteHide

Sub-Vitreous, Resinous, Dull
Colourless, light yellow, light green, almost white; colourless in transmitted light.
4½ on Mohs scale
Parallel to (111) and 111) only.
3.126 - 3.29 g/cm3 (Measured)    3.29 g/cm3 (Calculated)

Optical Data of LacroixiteHide

Biaxial (-)
RI values:
nα = 1.546 nβ = 1.563 nγ = 1.580
Measured: 89° , Calculated: 88°
Max Birefringence:
δ = 0.034
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Slight r
Optical Extinction:

Chemical Properties of LacroixiteHide


Crystallography of LacroixiteHide

Crystal System:
Class (H-M):
2/m - Prismatic
Space Group:
Cell Parameters:
a = 6.414 Å, b = 8.207 Å, c = 6.885 Å
β = 115.47°
a:b:c = 0.782 : 1 : 0.839
Unit Cell V:
327.20 ų (Calculated from Unit Cell)
Usually massive or intergrown with other minerals. Rarely observed as fragmentary crystals.

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0000996LacroixiteLahti S I, Pajunen A (1985) New data on lacroixite, NaAlFPO4 American Mineralogist 70 849-85519850293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
4.73 Å(51)
4.627 Å(32)
3.155 Å(100)
2.895 Å(98)
2.476 Å(57)
2.166 Å(43)
1.578 Å(27)
ICDD 39-325

Type Occurrence of LacroixiteHide

General Appearance of Type Material:
intergrowths, alteration rims, druses
Place of Conservation of Type Material:
Charles University, Prague, Czech Republic, 7400;
Harvard University, Cambridge, Massachusetts, USA, 86746.
Geological Setting of Type Material:
Granite pegmatites
Associated Minerals at Type Locality:

Other Language Names for LacroixiteHide

Simplified Chinese:锥晶石
Traditional Chinese:錐晶石

Relationship of Lacroixite to other SpeciesHide

Member of:
Other Members of this group:
ArsenatrotitaniteNaTi(AsO4)OMon. 2/m : B2/b
DurangiteNaAl(AsO4)FMon. 2/m : B2/b
IsokiteCaMg(PO4)FMon. 2/m : B2/b
KononoviteNaMg(SO4)FMon. 2/m : B2/b
MaxwelliteNaFe3+(AsO4)FMon. 2/m : P2/m
TilasiteCaMg(AsO4)FMon. m : Bb

Common AssociatesHide

Associated Minerals Based on Photo Data:
1 photo of Lacroixite associated with BerliniteAlPO4
1 photo of Lacroixite associated with ScorzaliteFe2+Al2(PO4)2(OH)2

Related Minerals - Nickel-Strunz GroupingHide

8.BH.CrimsonitePbFe3+2(PO4)2(OH)2Orth. mmm (2/m 2/m 2/m) : Cccm
8.BH.05ThadeuiteCa(Mg,Fe2+)3(PO4)2(OH,F)2Orth. 2 2 2 : C2 2 21
8.BH.10DurangiteNaAl(AsO4)FMon. 2/m : B2/b
8.BH.10IsokiteCaMg(PO4)FMon. 2/m : B2/b
8.BH.10MaxwelliteNaFe3+(AsO4)FMon. 2/m : P2/m
8.BH.10TilasiteCaMg(AsO4)FMon. m : Bb
8.BH.15DrugmanitePb2(Fe3+,Al)(PO4)(PO3OH)(OH)2Mon. 2/m : P21/b
8.BH.20CirroliteCa3Al2(PO4)3(OH)3 (?)
8.BH.20PenikisiteBa(Mg,Fe2+,Ca)2Al2(PO4)3(OH)3Mon. 2/m : P21/m
8.BH.20PerloffiteBa(Mn2+,Fe2+)2Fe3+2(PO4)3(OH)3Mon. 2/m : P21/m
8.BH.20JohntomaiteBaFe2+2Fe3+2(PO4)3(OH)3Mon. 2/m : P21/m
8.BH.30CarminitePbFe3+2(AsO4)2(OH)2Orth. mmm (2/m 2/m 2/m) : Cccm
8.BH.30SewarditeCaFe3+2(AsO4)2(OH)2Orth. mmm (2/m 2/m 2/m) : Cccm
8.BH.35AdeliteCaMg(AsO4)(OH)Orth. 2 2 2 : P21 21 21
8.BH.35ArsendescloizitePbZn(AsO4)(OH)Orth. 2 2 2 : P21 21 21
8.BH.35AustiniteCaZn(AsO4)(OH)Orth. 2 2 2 : P21 21 21
8.BH.35CobaltaustiniteCaCo(AsO4)(OH)Orth. 2 2 2 : P21 21 21
8.BH.35ConichalciteCaCu(AsO4)(OH)Orth. 2 2 2 : P21 21 21
8.BH.35DuftitePbCu(AsO4)(OH)Orth. 2 2 2 : P21 21 21
8.BH.35GabrielsonitePbFe3+(As3+O3)OOrth. mm2 : Pmc21
8.BH.35NickelaustiniteCaNi(AsO4)(OH)Orth. 2 2 2 : P21 21 21
8.BH.35TangeiteCaCu(VO4)(OH)Orth. 2 2 2 : P21 21 21
8.BH.35GottlobiteCaMg(VO4)(OH)Orth. 2 2 2 : P21 21 21
8.BH.35HermannroseiteCaCu(PO4)(OH)Orth. 2 2 2 : P21 21 21
8.BH.40ČechitePbFe2+(VO4)(OH)Orth. mmm (2/m 2/m 2/m)
8.BH.40DescloizitePbZn(VO4)(OH)Orth. mmm (2/m 2/m 2/m) : Pnma
8.BH.40MottramitePbCu(VO4)(OH)Orth. mmm (2/m 2/m 2/m) : Pnma
8.BH.40PyrobelonitePbMn2+(VO4)(OH)Orth. mmm (2/m 2/m 2/m) : Pnma
8.BH.45BayldonitePbCu3(AsO4)2(OH)2Mon. 2/m : B2/b
8.BH.45VésigniéiteBaCu3(VO4)2(OH)2Mon. 2/m : B2/m
8.BH.50PaganoiteNiBi(AsO4)OTric. 1 : P1
8.BH.60AttakoliteCaMn2+Al4(SiO3OH)(PO4)3(OH)4Mon. 2/m : B2/m
8.BH.65LeningraditePbCu3(VO4)2ClOrth. mmm (2/m 2/m 2/m) : Ibam

Related Minerals - Dana Grouping (8th Ed.)Hide 2/m : B2/b 2/m : P2/m

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

22.1.1AmblygoniteLiAl(PO4)FTric. 1 : P1
22.1.3NatrophosphateNa6+xHxF(PO4)2 · (19+x)H2OIso. m3m (4/m 3 2/m) : Fd3c
22.1.5NacaphiteNa2Ca(PO4)FMon. 2/m : P21/b
22.1.6ArctiteNa2Ca4(PO4)3FTrig. 3m (3 2/m) : R3m
22.1.9FluorapatiteCa5(PO4)3FHex. 6/m : P63/m
22.1.10HerderiteCaBe(PO4)FMon. 2/m
22.1.11IsokiteCaMg(PO4)FMon. 2/m : B2/b
22.1.14FluelliteAl2(PO4)F2(OH) · 7H2OOrth. mmm (2/m 2/m 2/m) : Fddd
22.1.15MinyuliteKAl2(PO4)2(OH,F) · 4H2OOrth. mm2 : Pba2
22.1.16MoriniteNaCa2Al2(PO4)2(OH)F4 · 2H2OMon. 2/m
22.1.18FluorstrophiteSrCaSr3(PO4)3FHex. 6/m : P63/m
22.1.20VäyryneniteMn2+Be(PO4)(OH,F)Mon. 2/m : P21/b
22.1.21MaxwelliteNaFe3+(AsO4)FMon. 2/m : P2/m
22.1.22Wagnerite(Mg,Fe2+)2(PO4)FMon. 2/m : P21/b
22.1.23TripliteMn2+2(PO4)FMon. 2/m
22.1.25ZwieseliteFe2+2(PO4)FMon. 2/m : P21/b
22.1.26McauslaniteFe3Al2(PO4)3(PO3OH)F · 18H2OTric.
22.1.28SvabiteCa5(AsO4)3FHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
22.1.29TilasiteCaMg(AsO4)FMon. m : Bb
22.1.30Johnbaumite-MCa5(AsO4)3OHMon. 2/m : P21/m
22.1.31DurangiteNaAl(AsO4)FMon. 2/m : B2/b

Other InformationHide

Readily soluble in HCl and H2SO4.
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 LacroixiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Slavík (1914) Bulletin de la Société française de Minéralogie: 37: 157.
Slavík (1914) Ac. sc. Bohéme Bulletin, no. 4: 19.
Slavík (1915) Ac. sc. Bohéme: 20: 372.
Larsen, E.S. and Berman, H. (1934) The Microscopic Determination of the Nonopaque Minerals, Second edition, USGS Bulletin 848: 159.
Palache, C., Berman, H., and Frondel, C. (1951) The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 783.
American Mineralogist (1972) 57: 1914.
Lahti, S.I. and Pajunen, A. (1985) New data on lacroixite, NaAlFPO4. Part I. Occurrence, physical properties and chemical composition. Part II. Crystal structure. American Mineralogist: 70: 849-855.
Fransolet, A.M. (1989) The problem of Na-Li substitution in primary Li-Al phosphates: new data on lacroixite, a relatively widespread mineral. Canadian Mineralogist: 27: 211-217.

Internet Links for LacroixiteHide

Localities for LacroixiteHide

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.
  • Córdoba Province
    • Calamuchita Department
      • Río de Los Sauces District
        • El Guaico mining district
Demartis, M., Melgarejo, J. C., Colombo, F., Alfonso, P., Coniglio, J. E., Pinotti, L. P., & D’Eramo, F. J. (2014). Extreme F activities in late pegmatitic events as a key factor for LILE and HFSE enrichment: The Ángel pegmatite, central Argentina. The Canadian Mineralogist, 52(2), 247-269.
    • Cruz del Eje department
      • Candelaria District
Kampf, A.R., F. Colombo, W.B. Simmons Jr., A. Falster, J.W. Nizamoff (2010): Galliskiite, Ca4Al2(PO4)2F8 x 5H2O, a new mineral from the Gigante granitic pegmatite, Cordoba province, Argentina. American Mineralogist. 95, 392-96
  • Victoria
    • East Gippsland Shire
      • Omeo
        • Mt Wills mining district
          • Dorchap Dyke Swarm
Eagle, R., Petrology, petrogenesis and mineralisation of granitic pegmatites of the Mount Wills district, northeastern Victoria
Czech Republic
  • Karlovy Vary Region
    • Cheb District
Breiter K., Škoda R., Veselovský F.: Neobvyklý P-, Li- a Sn-bohatý pegmatit z Vernéřova u Aše, Česká republika. Bulletin Mineralogicko-petrografického oddělení Národního muzea v Praze, 2009, roč. 17, č. 1, s. 41-59.
Handbook of Mineralogy (
Černý, P., Veselovský, F.: Pegmatit Bílý kámen (Weisser Stein) u Kynžvartu. Minerál, 2000, roč. 8, č. 1, s. 10-16.
  • Vysočina Region
    • Jihlava District
      • Puklice
Novak, M., & Divis, K. (1996). Compositional trends in manganocolumbite from the Puklice I pegmatite, western Moravia, Czech Republic. Journal of GEOsciences, 41(1-2), 1-6.
      • Velký Beranov
        • Jeclov
Handbook of Mineralogy (
    • Žďár nad Sázavou District
      • Rožná
Novák, M.: Amblygonit a produkty jeho přeměny v Li pegmatitu z Rožné. Minerál, 2001, roč. 9, č. 5, s. 326-327
P. Pauliš (2001): Nejzajímavější naleziště Moravy a Slezska. Kuttna, Kutná Hora.
  • Pirkanmaa
    • Orivesi
      • Eräjärvi area
Sandström, F. & Lahti, S.I. (2009): Viitaniemipegmatiten i Eräjärvi, Orivesi, Finland. Litiofilen 26 (1): 11-38
  • Auvergne-Rhône-Alpes
    • Allier
      • Vichy
        • Échassières
Econ Geol (1995) 90:548-576
  • Nouvelle-Aquitaine
    • Creuse
      • Aubusson
        • Soumans
Handbook of Mineralogy (
Pirard, C., Hatert, F., and Fransolet, A.-M. (2007) Alteration sequences of aluminium phosphates from Montebras Pegmatite, Massif Central, France. Granitic Pegmatites: The State of the Art – International Symposium. 06th – 12th May 2007, Porto, Portugal.; Patureau, J., Chiaperro, P.-J., and Lebocey, J. (2011) Mines et minéraux de Montebras, Soumans (Creuse). Le Règne Minéral, 99, 5-33.
Germany (TL)
  • Saxony
    • Erzgebirgskreis
      • Ehrenfriedersdorf
Slavik, F. (1914) Neue Phosphate vom Greifenstein bei Ehrenfriedersdorf. Bulletin international de l’Académie des Sciences de Bohème: 19: 1-16.; Palache, C., Berman, H., and Frondel, C. (1951) The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 783.; Wittern, A. (2001) Mineralfundorte in Deutschland. Schweizerbart (Stuttgart).; Handbook of Mineralogy (
  • Fukuoka prefecture
    • Munakata City
Shirose, Y., Uehara, S. (2014) Secondary phosphates in montebrasite and amblygonite from Nagatare, Fukuoka Prefecture, Japan. Journal of Mineralogical and Petrological Sciences, 109, 103-108.; Shirose, Y., & Uehara, S. (2014). Secondary phosphates in montebrasite and amblygonite from Nagatare, Fukuoka Prefecture, Japan. Journal of Mineralogical and Petrological Sciences, 109(2), 103-108.
  • Castelo Branco
    • Idanha-a-Nova
      • União de Freg de Segura e Zebreira
Antunes, I. M. H. R., Neiva, A. M. R., Ramos, J. M. F., Silva, P. B., Silva, M. M. V. G., & Corfu, F. (2013). Petrogenetic links between lepidolite-subtype aplite-pegmatite, aplite veins and associated granites at Segura (central Portugal). Chemie der Erde-Geochemistry, 73(3), 323-341.
  • Western Province
    • Ngororero District
      • Bwira
European Journal of Mineralogy: 17(5): 749-759.; Lefèvre, P., Fransolet, A. M., Fontan, F., & Keller, P. Petrographic study of the Al-rich phosphate mineral associations of the Rubindi-Kabilizi pegmatite, Gatumba area, Rwanda.
      • Muhororo
Fransolet, A.-M. and Abraham, K. (1983) Une association triplite-montebrasite-griphite dans la pegmatite de Buranga, Rwanda. Annales de la Société Geologique de Belgique: 106: 299-309.; Daltry, V.D.C. and von Knorring, O. (1998) Type-mineralogy of Rwanda with particular reference to the Buranga pegmatite. Geologica Belgica: 1: 9-15.; Handbook of Mineralogy (;
Fransolet, Andre-Mathieu, 1989, The Problem of Na-Li Substitution in Primary Li-Al Phosphates: New Data on Lacroixite, a Relatively Widespread Mineral, Canadian Mineralogist, v. 27, p. 211-217.
Handbook of Mineralogy (
  • Košice Region
    • Gelnica District
      • Henclová
Petrík, I., Kubiś, M., Konečný, P. & Malachovský, P. (2011): Rare phospates from the Surovec Topaz-Li-Mica microgranite, Gemeric Unit, Western Carpathians, Slovak Republik: Role of F/H2O of melt. Canadian Mineralogist. 49. 521-540
  • Connecticut
    • Middlesex Co.
      • Portland
        • Collins Hill
          • Strickland pegmatite (Strickland-Cramer Quarry; Strickland-Cramer Mine; Strickland-Cramer Feldspar-Mica Quarries)
Schooner, Richard (circa 1985) Untitled manuscript on central Connecticut mineralogy.; Handbook of Mineralogy (
  • Maine
    • Oxford County
      • Hebron
Fransolet, André-Mathieu (1989) The Problem of Na-Li Substitution in Primary Li-Al Phosphates: New Data on Lacroixite, a Relatively Widespread Mineral. Canadian Mineralogist: 27: 211-217.; Handbook of Mineralogy (
  • Tennessee
    • Sevier Co.
      • East Fork Mining District
        • East Fork Mine (East Fork manganese mine)
Travis A. Paris (2011) Tennessee mineral locality index. Rocks & Minerals, 86, #4, 300-328.
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