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Eucryptite

A valid IMA mineral species - grandfathered
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About EucryptiteHide

Formula:
LiAlSiO4
Colour:
Colorless, white, pale tan, pale gray
Lustre:
Sub-Vitreous, Resinous, Greasy
Hardness:
Specific Gravity:
2.657 - 2.666
Crystal System:
Trigonal
Member of:
Name:
Named in 1880 by Brush and Dana from the Greek for "well concealed", in allusion to its occurrence embedded in albite. Also known as α-eucryptite or alpha-eucryptite.

Unique IdentifiersHide

Mindat ID:
1419
Long-form identifier:
mindat:1:1:1419:5
GUID
(UUID V4):
c5cd765a-e4cf-4828-bf56-5f1179d436db

IMA Classification of EucryptiteHide

Approved, 'Grandfathered' (first described prior to 1959)
First published:
1880

Classification of EucryptiteHide

9.AA.05

9 : SILICATES (Germanates)
A : Nesosilicates
A : Nesosilicates without additional anions; cations in tetrahedral [4] coordination
Dana 7th ed.:
51.1.1.3
51.1.1.3

51 : NESOSILICATES Insular SiO4 Groups Only
1 : Insular SiO4 Groups Only with cations in [4] coordination
16.1.3

16 : Silicates Containing Aluminum and other Metals
1 : Aluminosilicates of Li

Mineral SymbolsHide

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

Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.

SymbolSourceReference
EcpIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43
EcrThe Canadian Mineralogist (2019)The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download

Physical Properties of EucryptiteHide

Sub-Vitreous, Resinous, Greasy
Transparency:
Transparent, Translucent
Comment:
Usually sub-vitrous
Colour:
Colorless, white, pale tan, pale gray
Streak:
White
Hardness:
6½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Poor/Indistinct
Poor on {1010} and {0001}.
Fracture:
Irregular/Uneven, Conchoidal
Comment:
Pure masses from Bikita show conchoidal fracture.
Density:
2.657 - 2.666 g/cm3 (Measured)    2.654 g/cm3 (Calculated)

Optical Data of EucryptiteHide

Type:
Uniaxial (+)
RI values:
nω = 1.570 - 1.573 nε = 1.583 - 1.587
Max Birefringence:
δ = 0.013
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low

Chemistry of EucryptiteHide

Mindat Formula:
LiAlSiO4
Common Impurities:
Na,K

Crystallography of EucryptiteHide

Crystal System:
Trigonal
Class (H-M):
3 - Rhombohedral
Space Group:
R3
Setting:
R3
Cell Parameters:
a = 13.48 Å, c = 9.01 Å
Ratio:
a:c = 1 : 0.668
Unit Cell V:
1,417.87 ų (Calculated from Unit Cell)
Z:
18
Morphology:
Usually massive, rarely in equant euhedral crystals with {1010}, {0001}, and {1120}. (Bikita: Hurlbut, 1962). More complex crystals found at Kings Mountain, North Carolina, USA.
Twinning:
Some eucryptite samples are polysynthetically twinned, with alternating thin and broad twin lamellae. Sometimes possible to recognize the twinning with the naked eye. The angle between the optic axes of two adjacent crystals is about 74° and the angle between the composition plane of the crystals and the optic axis 37°.

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0000376EucryptitePillars W W, Peacor D R (1973) The crystal structure of beta eucryptite as a function of temperature American Mineralogist 58 681-69019730296
0000377EucryptitePillars W W, Peacor D R (1973) The crystal structure of beta eucryptite as a function of temperature American Mineralogist 58 681-69019730473
0000378EucryptitePillars W W, Peacor D R (1973) The crystal structure of beta eucryptite as a function of temperature American Mineralogist 58 681-69019730608
0000379EucryptitePillars W W, Peacor D R (1973) The crystal structure of beta eucryptite as a function of temperature American Mineralogist 58 681-69019730713
0000380EucryptitePillars W W, Peacor D R (1973) The crystal structure of beta eucryptite as a function of temperature American Mineralogist 58 681-69019730757
0000381EucryptitePillars W W, Peacor D R (1973) The crystal structure of beta eucryptite as a function of temperature American Mineralogist 58 681-69019730920
0002630EucryptiteDaniels P, Fyfe C A (2001) Al, Si order in the crystal structure of alpha-eucryptite (LiAlSiO4) American Mineralogist 86 279-28320010293
0002631EucryptiteDaniels P, Fyfe C A (2001) Al, Si order in the crystal structure of alpha-eucryptite (LiAlSiO4) Not the correct model American Mineralogist 86 279-28320010293
0010936EucryptiteHesse K F (1985) Crystal structures of natural and synthetic alpha-eucryptite, LiAlSiO4 Zeitschrift fur Kristallographie 172 147-1511985synthetic0293
0010937EucryptiteHesse K F (1985) Crystal structures of natural and synthetic alpha-eucryptite, LiAlSiO4 Zeitschrift fur Kristallographie 172 147-1511985Zimbabwae0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

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Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.
Powder Diffraction Data:
d-spacingIntensity
6.74 Å(60)
4.20 Å(30)
3.96 Å(100)
3.89 Å(40)
3.37 Å(90)
2.74 Å(80)
2.55 Å(60)
2.38 Å(30)

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 4b: Highly evolved igneous rocks>3.0
34 : Complex granite pegmatites
Geological Setting:
In lithium-rich pegmatites, often as graphic intergrowths with albite derived from alteration of spodumene.

Type Occurrence of EucryptiteHide

General Appearance of Type Material:
Compact masses with an indistinct fibrous to columnar structure.
Place of Conservation of Type Material:
No designated type specimen.
Geological Setting of Type Material:
Lithium-rich pegmatite.
Associated Minerals at Type Locality:

Synonyms of EucryptiteHide

Other Language Names for EucryptiteHide

German:Eucryptit
Norwegian:Eukryptitt
Simplified Chinese:锂霞石
Spanish:Eucryptita

Relationship of Eucryptite to other SpeciesHide

Member of:
Other Members of this group:
PhenakiteBe2SiO4Trig. 3 : R3
WillemiteZn2SiO4Trig. 3 : R3

Common AssociatesHide

Associated Minerals Based on Photo Data:
25 photos of Eucryptite associated with SpodumeneLiAlSi2O6
10 photos of Eucryptite associated with ScheeliteCa(WO4)
10 photos of Eucryptite associated with QuartzSiO2
8 photos of Eucryptite associated with AlbiteNa(AlSi3O8)
7 photos of Eucryptite associated with BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
6 photos of Eucryptite associated with Cookeite(LiAl4◻)[AlSi3O10](OH)8
5 photos of Eucryptite associated with ChlorophaneCaF2
4 photos of Eucryptite associated with Pollucite(Cs,Na)2(Al2Si4O12) · 2H2O
4 photos of Eucryptite associated with HsianghualiteCa3Li2(Be3Si3O12)F2
4 photos of Eucryptite associated with Lepidolite

Related Minerals - Strunz-mindat GroupingHide

9.AA.05PhenakiteBe2SiO4Trig. 3 : R3
9.AA.05WillemiteZn2SiO4Trig. 3 : R3
9.AA.10LiberiteLi2BeSiO4Mon. m : Pm

Fluorescence of EucryptiteHide

Magenta-red or orange under SW UV. Generally fluorescent (both natural and synthetic), however, Haapaluoma eucryptite is not fluorescent. The fluorescence of Tanco eucryptite fades rapidly after the larger grains have been crushed and disappears completely in powdered material (Cerny 1972).

Other InformationHide

Notes:
Gelatinizes with HCl.
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 EucryptiteHide

References for EucryptiteHide

Reference List:

Localities for EucryptiteHide

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.
Australia
 
  • Western Australia
    • Coolgardie Shire
      • Nepean
Jacobson et al. (2007)
Canada
 
  • Manitoba
    • Lac-du-Bonnet area
      • Bernic Lake
153-155. +4 other references
  • Ontario
    • Kenora District
      • Paterson Lake Area
Blackburn C. et al (2002)
Tindle et al. (2002)
China
 
  • Hunan
    • Chenzhou
      • Linwu Co.
        • Xianghualing Sn-polymetallic ore field
Anthony
  • Jiangxi
    • Yichun
      • Yuanzhou District
        • Yichun complex (Yashan batholith)
Xudong Che et al. (2007)
  • Xinjiang
    • Yili Hasake Autonomous Prefecture (Ili Kazakh Autonomous Prefecture)
      • Aletai Prefecture (Altay Prefecture)
        • Fuyun Co. (Koktokay Co.)
          • Koktokay pegmatite field (Keketuohai pegmatite field)
            • Altay Mine
Tianren Zou et al. (1986) +2 other references
Egypt
 
  • Red Sea Governorate
Gehad M. Saleh (2007)
Finland
 
  • South Ostrobothnia
    • Kuortane
Lahti +1 other reference
    • Seinäjoki
      • Peräseinäjoki
Lahti et al. (1982)
Kazakhstan
 
  • East Kazakhstan Region
    • Ulan District
Oitseva et al. (2017)
Namibia
 
  • Erongo Region
    • Arandis Constituency
      • Cape Cross area
www.mineral.tu-freiberg.de (2003)
Keller (1991) +1 other reference
  • Kunene Region
    • Khorixas
von Bezing (2007)
  • ǁKaras Region
    • Karasburg East
      • Tantalite Valley
Baldwin (1994)
Poland
 
  • Lower Silesian Voivodeship
    • Dzierżoniów County
      • Piława Górna
        • DSS Piława Górna Quarry
Pieczka et al. (2012)
Portugal
 
  • Guarda
    • Figueira de Castelo Rodrigo
      • Algodres, Vale de Afonsinho e Vilar de Amargo
Errandonea-Martin et al. (2022)
  • Vila Real
    • Barroso-Alvão pegmatite field
Novák (2009)
Russia
 
  • Irkutsk Oblast
Pavel.M. Kartashov (n.d.) +2 other references
  • Murmansk Oblast
    • Voron'i Tundry
Zozulya et al. (2024)
James Cheshire collection
South Africa
 
  • Northern Cape
    • Namakwa District Municipality
Cairncross et al. (1995)
      • Nama Khoi Local Municipality
        • Steinkopf
Cairncross et al. (1995)
Spain
 
  • Castile and Leon
Errandonea-Martin et al. (2022)
    • Salamanca
Roda-Robles et al. (2010)
Encarnación Roda-Robles (2007) +1 other reference
Errandonea-Martin et al. (2022)
Sweden
 
  • Stockholm County
    • Haninge
      • Utö
Langhof et al. (1998)
UK
 
  • England
    • Devon
      • West Devon
        • Okehampton Hamlets
Fraudulent Kingsbury locality.
USA
 
  • Arizona
    • Yavapai County
AmMin 67: 97-113 (1982)
        • Independence Gulch
London (1978) +2 other references
London (1978) +2 other references
  • Connecticut
    • Fairfield County
      • Redding (Reading)
        • Branchville
Ronald Januzzi collection +4 other references
    • Middlesex County
      • Portland
        • Collins Hill
          • Strickland pegmatite
Ralph Lieser of Pappy’s Beryl Shop +3 other references
  • Maine
    • Oxford County
      • Newry
King et al. (1994)
  • New Hampshire
    • Strafford County
      • Strafford
        • Parker Mountain
Rocks & Min.:64:504. +1 other reference
  • New Mexico
    • Taos County
      • Picuris District
Jahns et al. (1977) +1 other reference
  • North Carolina
    • Alexander County
London et al. (1982)
    • Cleveland County
      • Kings Mountain
White et al. (1969) +2 other references
  • South Dakota
    • Custer County
      • Custer Mining District
        • Fourmile
Staatz +4 other references
    • Pennington County
      • Keystone Mining District
        • Keystone
Rocks & Minerals: 67 (6) +1 other reference
Zimbabwe
 
  • Masvingo
    • Bikita District
Roland Schmidt Collection
Tschernich (1992) +1 other reference
Hurlbut (1958)
 
矿物 and/or 产地  
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