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Leucophanite

A valid IMA mineral species - grandfathered
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About LeucophaniteHide

Formula:
NaCaBeSi2O6F
Colour:
Pale yellow, greenish white, yellowish green, colourless,
Lustre:
Vitreous, Greasy
Hardness:
4
Specific Gravity:
2.96 - 3.07
Crystal System:
Orthorhombic
Name:
First found, around 1824, by the Norwegian priest and mineral collector Hans Morten Thrane Esmark (1801-1882) and later named as leucophan by him in 1829. From the Greek for white λευκός, and to appear, φαίνομαι, in allusion to its property of throwing back a white shine when observing it from certain angles. The first description was published by Erdmann (1840). The name was later changed, in the 20th century, to leucophanite. The crystal structure was solved by Cannillo et al. (1967).
This page provides mineralogical data about Leucophanite.


Unique IdentifiersHide

Mindat ID:
2383
Long-form identifier:
mindat:1:1:2383:8
GUID
(UUID V4):
68eff48c-8066-4cdf-88f5-2a7e823125d1

IMA Classification of LeucophaniteHide

Approved, 'Grandfathered' (first described prior to 1959)
First published:
1840

Classification of LeucophaniteHide

9.DH.05

9 : SILICATES (Germanates)
D : Inosilicates
H : Inosilicates with 4-periodic single chains, Si4O12
55.4.2.4

55 : SOROSILICATES Si2O7 Groups,Generally with no Additional Anions
4 : Si2O7 Groups, Generally with No Additional Anions with cations in [8] and lower coordination
17.1.8

17 : Silicates Containing other Anions
1 : Silicates with fluoride (not containing Al)

Mineral SymbolsHide

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

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

Physical Properties of LeucophaniteHide

Vitreous, Greasy
Transparency:
Transparent, Translucent
Colour:
Pale yellow, greenish white, yellowish green, colourless,
Streak:
White
Hardness:
Tenacity:
Very brittle
Cleavage:
Perfect
On {001}, distinct on {100},{010} and [201}.
Fracture:
Irregular/Uneven, Conchoidal
Density:
2.96 - 3.07 g/cm3 (Measured)    2.961 g/cm3 (Calculated)

Optical Data of LeucophaniteHide

Type:
Biaxial (-)
RI values:
nα = 1.571 nβ = 1.595 nγ = 1.598
2V:
Measured: 36° to 50°, Calculated: 38°
Max Birefringence:
δ = 0.027
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r > v
Optical Extinction:
X = c; Y = a; Z = b.

Chemistry of LeucophaniteHide

Mindat Formula:
NaCaBeSi2O6F
Common Impurities:
Al,Fe,Mg,K,H2O

Crystallography of LeucophaniteHide

Crystal System:
Orthorhombic
Class (H-M):
2 2 2 - Disphenoidal
Space Group:
P21 21 21
Cell Parameters:
a = 7.401(2) Å, b = 7.412 Å, c = 9.990(2) Å
Ratio:
a:b:c = 0.999 : 1 : 1.348
Unit Cell V:
548.01 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Pinacoids {100}, {010} and {001}, prisms {110}, {201}, sphenoids {111} and{111}. Other forms include {101}, {102}, {113}.
Twinning:
Penetration fourlings; polysynthetic parallel to {110}.
Comment:
Pseudotetragonal. Space Group: P 1: a = 7.417(4) b = 7.398(4) c = 9.986(4) ® = 90:00(2) ± ¯ = 90:00(2) ± ° = 90:00(2) ± Z = 2

Crystallographic forms of LeucophaniteHide

Crystal Atlas:
Image Loading
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Leucophanite no.25 - Goldschmidt (1913-1926)
3d models and HTML5 code kindly provided by www.smorf.nl.

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Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0005227LeucophaniteGrice J D, Hawthorne F C (1989) Refinement of the crystal structure of leucophanite The Canadian Mineralogist 27 193-19719890293
0011026LeucophaniteCannillo E, Giuseppetti G, Mazzi F, Tazzoli V (1992) The crystal structure of a rare earth bearing leucophanite: (Ca,RE)CaNa2Be2Si4O12(F,O)2 Zeitschrift fur Kristallographie 202 71-791992Mt Saint Hilaire, Quebec, Canada0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Image Loading

Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.
Powder Diffraction Data:
d-spacingIntensity
2.75 Å(100)
3.60 Å(50)
2.97 Å(50)
1.69 Å(50)
2.31 Å(40)
2.20 Å(40)
1.98 Å(40)
Comments:
Eikaholmen, Langesundsfjord, Norway. ICDD 18-711.

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 LeucophaniteHide

General Appearance of Type Material:
Masses.
Place of Conservation of Type Material:
Mineralogical-Geological Museum, University of Oslo, Oslo, Norway, number 24918.
Geological Setting of Type Material:
Nepheline syenite pegmatite.
Associated Minerals at Type Locality:

Other Language Names for LeucophaniteHide

Norwegian:Leukofan
Simplified Chinese:白铍石
Spanish:Leucophanita
Traditional Chinese:白鈹石

Common AssociatesHide

Associated Minerals Based on Photo Data:
106 photos of Leucophanite associated with AegirineNaFe3+Si2O6
60 photos of Leucophanite associated with SeranditeNaMn2+2Si3O8(OH)
58 photos of Leucophanite associated with PolylithioniteKLi2Al(Si4O10)(F,OH)2
45 photos of Leucophanite associated with AlbiteNa(AlSi3O8)
35 photos of Leucophanite associated with MicroclineK(AlSi3O8)
25 photos of Leucophanite associated with AnalcimeNa(AlSi2O6) · H2O
16 photos of Leucophanite associated with ZirconZr(SiO4)
14 photos of Leucophanite associated with AstrophylliteK2NaFe2+7Ti2Si8O26(OH)4F
13 photos of Leucophanite associated with FluoriteCaF2
11 photos of Leucophanite associated with CatapleiiteNa2Zr(Si3O9) · 2H2O

Related Minerals - Strunz-mindat GroupingHide

9.DH.Gageite-2M(Mn,Mg,Zn)42Si16O54(OH)40Mon. 2/m
9.DH.BavsiiteBa2V2O2[Si4O12]Tet. 4/m : I4/m
9.DH.DevilliersiteCa4Ca2Fe3+10O4[(Fe3+10Si2)O36]Tric. 1 : P1
9.DH.YuzuxiangiteSr3Fe3+(Si2O6)2(OH) · 3H2OMon. 2/m : P21/m
9.DH.LouisfuchsiteCa2(Mg4Ti2)(Al4Si2)O20Tric. 1 : P1
9.DH.10OhmiliteSr3(Ti,Fe3+)(Si4O12)(O,OH) · 2-3H2OMon. 2/m : P21/m
9.DH.15HaradaiteSrVSi2O7Orth. mmm (2/m 2/m 2/m)
9.DH.15SuzukiiteBaVSi2O7Orth.
9.DH.20BatisiteBaNaNaTi2(Si4O12)O2Orth. mmm (2/m 2/m 2/m) : Imma
9.DH.20Shcherbakovite(K,Ba)KNa(Ti,Nb)2(Si4O12)O2Orth. mmm (2/m 2/m 2/m) : Imma
9.DH.20NoonkanbahiteBaKNaTi2(Si4O12)O2Orth. mmm (2/m 2/m 2/m) : Imma
9.DH.25TaikaniteSr3BaMn2+2(Si4O12)O2Mon. 2 : B2
9.DH.30KrauskopfiteBaSi2O5 · 3H2OMon. 2/m : P21/b
9.DH.35Balangeroite(Mg,Fe2+,Fe3+,Mn2+)42Si16O54(OH)40Mon. 2/m
9.DH.35GageiteMn21(Si4O12)2O3(OH)20Mon. 2/m
9.DH.40AenigmatiteNa4[Fe2+10Ti2]O4[Si12O36]Tric. 1 : P1
9.DH.40DorriteCa4(Mg3Fe3+9)O4(Si3Al8Fe3+O36)Tric.
9.DH.40HøgtuvaiteCa4[Fe2+6Fe3+6]O4[Si8Be2Al2O36]Tric. 1 : P1
9.DH.40KrinoviteNa2Mg4Cr3+2(Si6O18)O2Tric. 1 : P1
9.DH.40Makarochkinite(Ca,Na)4[Fe2+8Fe3+2Ti2]O4[Si8Be2Al2O36]Tric. 1 : P1
9.DH.40RhöniteCa4[Mg8Fe3+2Ti2]O4[Si6Al6O36]Tric. 1 : P1
9.DH.40SerendibiteCa4[Mg6Al6]O4[Si6B3Al3O36]Tric. 1 : P1
9.DH.40WelshiteCa4Mg9Sb3O4[Si6Be3AlFe2O36]Tric. 1 : P1
9.DH.40WilkinsoniteNa2Fe2+4Fe3+2(Si6O18)O2Tric. 1 : P1
9.DH.40LeucorhöniteCa2(Mg,Fe3+,Al)6(Si,Al)6O20Tric.
9.DH.40KuratiteCa2(Fe2+5Ti)O2[Si4Al2O18]Tric. 1 : P1
9.DH.40KhesiniteCa4(Mg3Fe3+9)O4(Fe3+9Si3)O36Tric. 1 : P1
9.DH.40UM1991-29-SiO:FeMgNaNa4(Mg5Fe3+7)O4[Si9Fe3+3O36]
9.DH.45SapphirineMg4(Mg3Al9)O4[Si3Al9O36]Mon. 2/m : P21/b
9.DH.50Khmaralite(Mg,Al,Fe)16[(Al,Si,Be)12O36]O4Mon. 2/m : P21/b
9.DH.55Surinamite(Mg,Fe)3Al4BeSi3O16Mon. 2/m
9.DH.55UM1988-26-SiO:AlMgMg4Al2O[Si3Al2O15]
9.DH.60Deerite(Fe,Mn)6(Fe,Al)3[Si6O17]O3(OH)5Mon. 2/m : P21/b
9.DH.65HowieiteNa(Fe,Mn)10(Fe,Al)2Si12O31(OH)13Tric.
9.DH.65Taneyamalite(Na,Ca)(Mn,Mg,Fe)12Si12(O,OH)44Tric.
9.DH.70JohninnesiteNa2Mn2+9Mg7(OH)8[AsO4]2[Si6O17]2Tric.
9.DH.75AgrelliteNaCa2Si4O10FTric. 1 : P1

Fluorescence of LeucophaniteHide

Triboluminescent with orange red light (http://www.mindat.org/mesg-6-204391.html). Pink, rarely blue in SW and LW UV light. strongly phosphorescent.

Other InformationHide

Electrical:
Pyroelectric.
Thermal Behaviour:
Heated in a closed tube, it whitens and phosphoresces bluish. Before the blowpipe in forceps it phosphoresces and fuses with intumescence at 8 to a clear colorless glass, which becomes white on flaming, imparting an intense yellow color to the flame.
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 LeucophaniteHide

References for LeucophaniteHide

Reference List:

Localities for LeucophaniteHide

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.
Belarus
 
  • Gomel Region
    • Zhytkavichy District
E.P. Shpanov et al. (1989) +1 other reference
Canada
 
  • Québec
    • Montérégie
      • La Vallée-du-Richelieu RCM
        • Mont Saint-Hilaire
Chao (1967) +2 other references
Greenland
 
  • Kujalleq
    • Igaliku
      • Narsaarsuk Plateau
Bøggild (1953) +1 other reference
      • Narsaarsuup Qaava
McDonald et al. (2001)
Petersen (2001)
Bøggild (1953) +1 other reference
Bohse et al. (2001)
Bohse et al. (2001) +1 other reference
Friis et al. (2007)
Bohse et al. (2001) +1 other reference
Bohse et al. (2001)
Guinea
 
  • Conakry Region
    • Los Archipelago (Los Islands)
Kazakhstan
 
  • Abai Region
    • Tarbagatai Range
      • Akzhaylyautas Mts (Akzhailyautas Mts; Akjaylautas Mts; Akzhalautas Mts)
Pavel.M. Kartashov (n.d.)
Norway
 
Knut Eldjarn photo & +1 other reference
  • Telemark
    • Porsgrunn
      • Auenlandet
        • Sagåsen
Berge et al. (1981) +1 other reference
Larsen et al. (2010) +1 other reference
Berge (n.d.)
      • Langangen
        • Kokkersvold - Blåfjell E18 roadcuts
Raade et al. (1983)
Raade et al. (1983)
Engvoldsen et al. (1991)
Larsen et al. (2010)
Larsen et al. (2010)
Larsen et al. (1991)
Larsen et al. (2010)
  • Vestfold
    • Larvik
Andersen et al. (1996)
Knut Edvard Larsen collection # MM-2305
      • Barkevik area
Friis et al. (2007)
        • Kjeøya
Frode Andersen observation 1989
Berge (n.d.)
Berge (n.d.)
Brøgger (1890, January)
Brøgger (1890, January)
Engvoldsen et al. (1991)
      • Brunlanes
Field collected and identified by Knut ...
Andersen et al. (1996)
      • Hedrum
        • Lågendalen
Larsen et al. (2010)
        • Lysebo
Larsen et al. (2010)
Erdmann (1840) +1 other reference
Larsen et al. (2010)
      • Stokkøya
Larsen et al. (2010)
Friis et al. (2007)
      • Store Arøya (Arøy)
Berge (n.d.)
Brøgger (1890, January)
      • Tjølling
        • Stålaker
Engvoldsen et al. (1991)
      • Tvedalen
Larsen et al. (1997)
Personally collected by Peter Andresen ... +1 other reference
Engvoldsen et al. (1991)
Peter Andresen collection +1 other reference
Nordrum (2007) +1 other reference
Nordrum (2001)
Larsen et al. (2010)
Nordrum (2012) +1 other reference
Engvoldsen et al. (1991)
      • Vesle Arøya
Brøgger (1890, January)
Engvoldsen et al. (1991) +2 other references
Bellezza et al. (2004)
Russia
 
  • Buryatia
    • Mama River Basin
      • Maigunda River
Pekov (1998) +1 other reference
  • Murmansk Oblast
    • Khibiny Massif
[World of Stones 95:5-6 +1 other reference
Arzamastsev et al. (2008)
PEKOV et al. (2013)
Pekov et al. (2004)
Mikhailova et al. (2007)
      • Yukspor Mt
[World of Stones 95:5-6
Neues Jahrbuch für Mineralogie (2003)
    • Lovozersky District
      • Seidozero Lake
Yakovenchuk et al. (2007)
Semenov E.I. (1972)
Lyalina et al. (2015) +2 other references
  • Tuva
    • Sangilen Upland
Kapustin et al. (1965) +1 other reference
Tajikistan
 
  • Districts of Republican Subordination
Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva: 132 (6) +1 other reference
UK
 
  • England
    • Devon
      • West Devon
        • Okehampton Hamlets
Fraudulent Kingsbury locality.
 
Mineral and/or Locality  
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