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Lacroixite

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Alfred Lacroix at his desk
Formula:
NaAl(PO4)F
System:
Monoclinic
Colour:
Colourless, light ...
Lustre:
Sub-Vitreous, Resinous, Dull
Hardness:
Member of:
Name:
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], French mineralogist.
Frequently occurs a 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 Lacroixite

Approved, 'Grandfathered' (first described prior to 1959)
8.BH.10

8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
H : With medium-sized and large cations, (OH,etc.):RO4 = 1:1
41.5.5.1

41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
5 : (AB)2(XO4)Zq
22.1.2

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

Physical Properties of Lacroixite

Sub-Vitreous, Resinous, Dull
Diaphaneity (Transparency):
Translucent
Colour:
Colourless, light yellow, light green, almost white; colourless in transmitted light.
Streak:
White
Hardness (Mohs):
Tenacity:
Brittle
Cleavage:
Poor/Indistinct
Parallel to (111) and 111) only.
Fracture:
Irregular/Uneven
Density:
3.126 - 3.29 g/cm3 (Measured)    3.29 g/cm3 (Calculated)

Optical Data of Lacroixite

Type:
Biaxial (-)
RI values:
nα = 1.546 nβ = 1.563 nγ = 1.580
2V:
Measured: 89° , Calculated: 88°
Birefringence:
0.034
Max Birefringence:
δ = 0.034
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
Slight r
Optical Extinction:
Inclined

Chemical Properties of Lacroixite

Formula:
NaAl(PO4)F
Elements listed in formula:

Crystallography of Lacroixite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Space Group Setting:
C2/c
Cell Parameters:
a = 6.414 Å, b = 8.207 Å, c = 6.885 Å
β = 115.47°
Ratio:
a:b:c = 0.782 : 1 : 0.839
Unit Cell Volume:
V 327.20 ų (Calculated from Unit Cell)
Morphology:
Usually massive or intergrown with other minerals. Rarely observed as fragmentary crystals.
Comment:
Pseudo-orthorhombic
X-Ray Powder Diffraction Data:
d-spacingIntensity
4.73 (51)
4.627 (32)
3.155 (100)
2.895 (98)
2.476 (57)
2.166 (43)
1.578 (27)
Comments:
ICDD 39-325

Type Occurrence of Lacroixite

General Appearance of Type Material:
intergrowths, alteration rims, druses
Geological Setting of Type Material:
Granite pegmatites

Relationship of Lacroixite to other Species

Member of:
Other Members of Group:
DurangiteNaAl(AsO4)F
IsokiteCaMg(PO4)F
KononoviteNaMg(SO4)F
MaxwelliteNaFe3+(AsO4)F
PanasqueiraiteCaMg(PO4)(OH,F)
TilasiteCaMg(AsO4)F
8.BH.05ThadeuiteCaMg3(PO4)2(OH,F)2
8.BH.10DurangiteNaAlAsO4F
8.BH.10IsokiteCaMgPO4F
8.BH.10MaxwelliteNaFe3+AsO4F
8.BH.10PanasqueiraiteCaMgPO4(OH)
8.BH.10TilasiteCaMgAsO4F
8.BH.15DrugmanitePb2Fe3+(PO4)(PO3OH)(OH)2
8.BH.20BjarebyiteBaMn22+Al2(PO4)3(OH)3
8.BH.20CirroliteCa3Al2(PO4)3(OH)3
8.BH.20KulaniteBaFe22+Al2(PO4)3(OH)3
8.BH.20PenikisiteBaMg2Al2(PO4)3(OH)3
8.BH.20PerloffiteBaMn22+Fe23+(PO4)3(OH)3
8.BH.20JohntomaiteBaFe22+Fe23+(PO4)3(OH)3
8.BH.25BertossaiteLi2CaAl4(PO4)4(OH)4
8.BH.25PalermoiteLi2SrAl4(PO4)4(OH)4
8.BH.30CarminitePbFe23+(AsO4)2(OH)2
8.BH.30SewarditeCaFe23+(AsO4)2(OH)2
8.BH.35AdeliteCaMgAsO4(OH)
8.BH.35ArsendescloizitePbZnAsO4(OH)
8.BH.35AustiniteCaZnAsO4(OH)
8.BH.35CobaltaustiniteCaCoAsO4(OH)
8.BH.35ConichalciteCaCuAsO4(OH)
8.BH.35DuftitePbCuAsO4(OH)
8.BH.35GabrielsonitePbFeAsO4(OH)
8.BH.35NickelaustiniteCaNiAsO4(OH)
8.BH.35TangeiteCaCuVO4(OH)
8.BH.35GottlobiteCaMg(VO4)(OH)
8.BH.35HermannroseiteCaCu(PO4)(OH)
8.BH.40ČechitePbFe2+VO4(OH)
8.BH.40DescloizitePbZnVO4(OH)
8.BH.40MottramitePbCuVO4(OH)
8.BH.40PyrobelonitePbMn2+VO4(OH)
8.BH.45BayldoniteCu3PbO(AsO3OH)2(OH)2
8.BH.45VésigniéiteCu3Ba(VO4)2(OH)2
8.BH.50PaganoiteNiBi3+OAsO4
8.BH.55JagoweriteBaAl2(PO4)2(OH)2
8.BH.60AttakoliteCaMn2+Al4(HSiO4)(PO4)3(OH)4
8.BH.65LeningraditePbCu3(VO4)2Cl2
22.1.1AmblygoniteLiAlPO4F
22.1.3NatrophosphateNa7(PO4)2F · 19H2O
22.1.5NacaphiteNa2Ca(PO4)F
22.1.6ArctiteNa5Ca7Ba(PO4)6F3
22.1.7NefedoviteNa5Ca4(PO4)4F
22.1.9FluorapatiteCa5(PO4)3F
22.1.10HerderiteCaBePO4F
22.1.11IsokiteCaMgPO4F
22.1.12PanasqueiraiteCaMgPO4(OH)
22.1.13BabefphiteBaBePO4F
22.1.14FluelliteAl2(PO4)F2(OH) · 7H2O
22.1.15MinyuliteKAl2(PO4)2F · 4H2O
22.1.16MoriniteNaCa2Al2(PO4)2(OH)F4 · 2H2O
22.1.17BøggilditeNa2Sr2Al2(PO4)F9
22.1.18FluorstrophiteSrCaSr3(PO4)3F
22.1.19ViitaniemiiteNaCaAlPO4F3
22.1.20VäyryneniteMn2+Be(PO4)OH
22.1.21MaxwelliteNaFe3+AsO4F
22.1.22WagneriteMg2PO4F
22.1.23Triplite(Mn2+,Fe2+)2PO4(F,OH)
22.1.24Magniotriplite(Mg,Fe2+,Mn2+)2PO4F
22.1.25ZwieseliteFe2+Mn2+PO4F
22.1.26McauslaniteFe32+Al2(PO4)3(PO3OH)F · 18H2O
22.1.27RichelliteCaFe23+(PO4)2(OH,F)2
22.1.28SvabiteCa5(AsO4)3F
22.1.29TilasiteCaMgAsO4F
22.1.30Johnbaumite-MCa5(AsO4)3OH
22.1.31DurangiteNaAlAsO4F

Other Names for Lacroixite

Name in Other Languages:
German:Lacroixit
Simplified Chinese:锥晶石
Spanish:Lacroixita
Traditional Chinese:錐晶石

Other Information

Other Information:
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 Lacroixite

Reference List:
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., & 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. 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 Lacroixite

mindat.org URL:
https://www.mindat.org/min-2310.html
Please feel free to link to this page.

Localities for Lacroixite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Argentina
 
  • Córdoba
    • Punilla Department
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
      • Sierra de Córdoba
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.
Australia
 
  • Victoria
    • East Gippsland Shire
      • Omeo
        • Mt Wills Mining District
          • Glen Wills
Eagle, R., Petrology, petrogenesis and mineralisation of granitic pegmatites of the Mount Wills district, northeastern Victoria
Czech Republic
 
  • Bohemia (Böhmen; Boehmen)
    • Karlovy Vary Region
      • Aš (Asch)
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.
      • Lázně Kynžvart (Bad Königswart)
Černý, P., Veselovský, F.: Pegmatit Bílý kámen (Weisser Stein) u Kynžvartu. Minerál, 2000, roč. 8, č. 1, s. 10-16.
  • Moravia (Mähren; Maehren)
    • Vysočina Region
      • Jihlava (Iglau)
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.
      • Žďár nad Sázavou
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.
Finland
 
  • Western and Inner Finland Region
    • Orivesi
      • Eräjärvi area
Sandström, F. & Lahti, S.I. (2009): Viitaniemipegmatiten i Eräjärvi, Orivesi, Finland. Litiofilen 26 (1): 11-38
France
 
  • Auvergne-Rhône-Alpes
    • Allier
      • Ébreuil
        • Échassières
Econ Geol (1995) 90:548-576
  • Nouvelle-Aquitaine
    • Creuse
      • Soumans
        • Montebras
Patureau, J., Chiappero, P-J. & Lebocey, J. (2011): Mines et minéraux de Montebras, Soumans, Creuse. Le Règne Minéral. 99, 5-33
Germany (TL)
 
  • Saxony
    • Erzgebirge
      • Ehrenfriedersdorf
Bull. Int. Acad. Sci, Bohéme (1914): 4: 19; Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 783; Wittern: "Mineralfundorte in Deutschland", 2001
Japan
 
  • Kyushu Region
    • Fukuoka Prefecture
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.
Portugal
 
  • Castelo Branco District
    • Idanha-a-Nova
      • Segura
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.
Rwanda
 
  • Western Province
    • Gatumba District
http://rruff.geo.arizona.edu/doclib/hom/lacroixite.pdf.; Daltry, V.D.C. and O. von Knorring (1998) Type-Mineralogy of Rwanda with Particular Reference to the Buranga Pegmatite. Geologica Belgica 1:1-9
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.
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.
Slovakia
 
  • Košice Region
    • Gelnica Co.
      • Henclová (Henzlová)
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
USA
 
  • 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.
  • Maine
    • Oxford Co.
      • Hebron
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. Later http://rruff.geo.arizona.edu/doclib/hom/lacroixite.pdf.
  • Tennessee
    • Sevier Co.
      • East Fork District
        • East Fork Mine (East Fork manganese mine)
Travis A. Paris (2011) Tennessee mineral locality index. Rocks & Minerals, 86, #4, 300-328.
Mineral and/or Locality  
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