A small nepheline-syenite dike close to the sea at Lille Arøya [Named as Ober-Arö or Övre Arö by Brögger]. W.C. Brögger first visited the locality in the summer of 1887. Two of the local collectors had found a mineral here, which later was described by Brögger as a new mineral and given the name eudidymite. His later morphological studies of the mineral (Brögger 1890) were done on about 25 crystals from the locality.

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Standard Detailed Gallery Strunz Chemical Elements

Mineral List

16 valid minerals. 1 (TL) - type locality of valid minerals. 2 erroneous literature entries.

Rock Types Recorded

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Alphabetical List Tree Diagram

ⓘ 'Pegmatitic nepheline syenite'

Detailed Mineral List:

ⓘ Aegirine

Formula: NaFe³⁺Si₂O₆

References:

Uwe Kolitsch (visual ID)

Brøgger, W.C. (1887) Om Eudidymit, et nyt norsk mineral. Foreløbig meddelelse [On Eudidymite, a new Norwegian mineral. Preliminary notice]. Nyt magazin for naturvidenskaberne [New magazine for the natural sciences], 31. Christiania [Oslo]. 196-199

ⓘ Analcime

Formula: Na(AlSi₂O₆) · H₂O

References:

Brøgger, Waldemar Christofer (1890, January) Die Mineralien der Syenitpegmatitgänge der südnorwegischen Augit-und Nephelinsyenite. Zeitschrift für Krystallographie und Mineralogie Vol. 16 (1) Walter de Gruyter GmbHp.56

ⓘ Ancylite-(Ce)

Formula: CeSr(CO₃)₂(OH) · H₂O

Description: Sæbø (1963) rexamined Brøggers "Weibyeite" and found it to be a mixture of Ancylite-(Ce) and bastnäsite-(Ce) pseudomorphs after ancylite-(Ce)

References:

Sæbø, Per Christian (1963) Contributions to the mineralogy of Norway. No. 20. The identity of Weibyeite. Norsk Geologisk Tidsskrift [Norwegian Journal of Geology], 43 (4) 441-443

ⓘ 'Apophyllite Group'

Formula: AB₄[Si₈O₂₂]X · 8H₂O

References:

ⓘ Astrophyllite

Formula: K₂NaFe²⁺₇Ti₂Si₈O₂₆(OH)₄F

References:

ⓘ Barylite

Formula: Be₂Ba(Si₂O₇)

Habit: extremely small thin needles /treads

Description: Resembling cotton wool

References:

Sæbø, Per Christian (1966) Contributions to the mineralogy of Norway. No. 35. The first occurrences of the rare mineral barylite, Be2BaSi2O7, in Norway. Norsk Geologisk Tidsskrift [Norwegian Journal of Geology], 46 (3) 335-348

ⓘ Bastnäsite-(Ce)

Formula: Ce(CO₃)F

Description: Brøgger described a new mineral he called "Weibeyite" from the known eudidymite-locality. Later Pecora (1959) and Sæbö (1963) found "weibeyite" to be bastnäsite-(Ce) pseudomorphoses after ancylite-(Ce) or both bastnäsite-(Ce) and ancylite-(Ce) pseudomorphoses after zircon.

References:

Sverdrup, Thor L., Bryn, Knut Ørn, Sæbø, Per Christian (1959) Contributions to the mineralogy of Norway. No. 2. Bastnäsite, a new mineral for Norway. Norsk Geologisk Tidsskrift [Norwegian Journal of Geology], 39 (2-3) 237-247

Sæbö (1963)

Neumann (1985, pp. 99 and 100).

ⓘ Bertrandite

Formula: Be₄(Si₂O₇)(OH)₂

References:

Knut Edvard Larsen collection (MM-5460)

ⓘ 'Biotite'

Formula: K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂

Description: Brøgger (1887) uses the designation "sort glimmer" (black mica)

References:

ⓘ Calcite

Formula: CaCO₃

References:

ⓘ 'Chlorite Group'

References:

Knut Edvard Larsen collection # MM-4016

ⓘ 'Eudialyte Group'

Formula: [N(1)N(2)N(3)N(4)N(5)]₃[M(1.1)M(1.2)]₃[M(2.1)M(2.2)M(2.3)]_3-6[M(3)M(4)]Z₃[Si₂₄O₇₂]Θ₄X(1)X(2)

References:

Knut Edvard larsen observation in field, photo id-781486

ⓘ Eudidymite (TL)

Formula: Na₂Be₂Si₆O₁₅ · H₂O

Type Locality:

References:

ⓘ Fluorite

Formula: CaF₂

References:

ⓘ Microcline

Formula: K(AlSi₃O₈)

Description: Brøgger (1887) refers to this as " hvid feldspath" ( white feldspar)

References:

ⓘ Molybdenite

Formula: MoS₂

References:

ⓘ Natrolite

Formula: Na₂Al₂Si₃O₁₀ · 2H₂O

References:

ⓘ Nepheline

Formula: Na₃K(Al₄Si₄O₁₆)

Description: Brøgger (1887) uses the name "elæolith"

References:

ⓘ ~~Parisite-(Ce)~~

Formula: CaCe₂(CO₃)₃F₂

Description: Brøgger (1890) described parisite from Lille Arøya. Sverdrup et al (1959) showed that this was actually bastnäsite-(Ce)

References:

Larsen, Alf Olav, Andersen, Frode, Dahlgren, Sven, Larsen, Knut Edvard, Burvald, Ingulv - Ed. (2010) The Langesundsfjord - History, geology, pegmatites, minerals. Bode Verlag Gmbh, Salzhemmendorf. p.1-240.

ⓘ Polylithionite

Formula: KLi₂Al(Si₄O₁₀)(F,OH)₂

References:

ⓘ '~~Weibyeite'~~

Description: A sample labelled Weibyeite and collected by W.C.Brøgger in 1902 was showed by Sverdrup et al. (1959) to be bastnäsite-(Ce). Sæbø (1963) rexamined Brøggers "Weibyeite" and found it to be a mixture of Ancylite-(Ce) and bastnäsite-(Ce) pseudomorphs after ancylite-(Ce)

References:

Sæbø, Per Christian (1963) Contributions to the mineralogy of Norway. No. 20. The identity of Weibyeite. Norsk Geologisk Tidsskrift [Norwegian Journal of Geology], 43 (4) 441-443

ⓘ Zircon

Formula: Zr(SiO₄)

References:

Sæbø, Per Christian (1963) Contributions to the mineralogy of Norway. No. 20. The identity of Weibyeite. Norsk Geologisk Tidsskrift [Norwegian Journal of Geology], 43 (4) 441-443

Gallery:

Na₂Be₂Si₆O₁₅ · H₂Oⓘ Eudidymite (TL)

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
ⓘ	Molybdenite	2.EA.30	MoS₂
Group 3 - Halides
ⓘ	Fluorite	3.AB.25	CaF₂
Group 5 - Nitrates and Carbonates
ⓘ	Calcite	5.AB.05	CaCO₃
ⓘ	Bastnäsite-(Ce)	5.BD.20a	Ce(CO₃)F
ⓘ	Parisite-(Ce) ?	5.BD.20b	CaCe₂(CO₃)₃F₂
ⓘ	Ancylite-(Ce)	5.DC.05	CeSr(CO₃)₂(OH) · H₂O
Group 9 - Silicates
ⓘ	Zircon	9.AD.30	Zr(SiO₄)
ⓘ	Barylite	9.BB.15	Be₂Ba(Si₂O₇)
ⓘ	Bertrandite	9.BD.05	Be₄(Si₂O₇)(OH)₂
ⓘ	Aegirine	9.DA.25	NaFe³⁺Si₂O₆
ⓘ	Astrophyllite	9.DC.05	K₂NaFe²⁺₇Ti₂Si₈O₂₆(OH)₄F
ⓘ	Eudidymite (TL)	9.DG.60	Na₂Be₂Si₆O₁₅ · H₂O
ⓘ	Polylithionite	9.EC.20	KLi₂Al(Si₄O₁₀)(F,OH)₂
ⓘ	Nepheline	9.FA.05	Na₃K(Al₄Si₄O₁₆)
ⓘ	Microcline	9.FA.30	K(AlSi₃O₈)
ⓘ	Natrolite	9.GA.05	Na₂Al₂Si₃O₁₀ · 2H₂O
ⓘ	Analcime	9.GB.05	Na(AlSi₂O₆) · H₂O
Unclassified
ⓘ	'Chlorite Group'	-
ⓘ	'Biotite'	-	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
ⓘ	'Apophyllite Group'	-	AB₄[Si₈O₂₂]X · 8H₂O
ⓘ	'Eudialyte Group'	-	[N(1)N(2)N(3)N(4)N(5)]₃[M(1.1)M(1.2)]₃[M(2.1)M(2.2)M(2.3)]_3-6[M(3)M(4)]Z₃[Si₂₄O₇₂]Θ₄X(1)X(2)
ⓘ	'Weibyeite' ?	-

List of minerals for each chemical element

H	Hydrogen
H	ⓘ Analcime	Na(AlSi₂O₆) · H₂O
H	ⓘ Ancylite-(Ce)	CeSr(CO₃)₂(OH) · H₂O
H	ⓘ Apophyllite Group	AB₄[Si₈O₂₂]X · 8H₂O
H	ⓘ Astrophyllite	K₂NaFe₇²⁺Ti₂Si₈O₂₆(OH)₄F
H	ⓘ Bertrandite	Be₄(Si₂O₇)(OH)₂
H	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
H	ⓘ Eudidymite	Na₂Be₂Si₆O₁₅ · H₂O
H	ⓘ Natrolite	Na₂Al₂Si₃O₁₀ · 2H₂O
H	ⓘ Polylithionite	KLi₂Al(Si₄O₁₀)(F,OH)₂
Li	Lithium
Li	ⓘ Polylithionite	KLi₂Al(Si₄O₁₀)(F,OH)₂
Be	Beryllium
Be	ⓘ Barylite	Be₂Ba(Si₂O₇)
Be	ⓘ Bertrandite	Be₄(Si₂O₇)(OH)₂
Be	ⓘ Eudidymite	Na₂Be₂Si₆O₁₅ · H₂O
C	Carbon
C	ⓘ Ancylite-(Ce)	CeSr(CO₃)₂(OH) · H₂O
C	ⓘ Bastnäsite-(Ce)	Ce(CO₃)F
C	ⓘ Calcite	CaCO₃
C	ⓘ Parisite-(Ce)	CaCe₂(CO₃)₃F₂
O	Oxygen
O	ⓘ Aegirine	NaFe³⁺Si₂O₆
O	ⓘ Analcime	Na(AlSi₂O₆) · H₂O
O	ⓘ Ancylite-(Ce)	CeSr(CO₃)₂(OH) · H₂O
O	ⓘ Apophyllite Group	AB₄[Si₈O₂₂]X · 8H₂O
O	ⓘ Astrophyllite	K₂NaFe₇²⁺Ti₂Si₈O₂₆(OH)₄F
O	ⓘ Barylite	Be₂Ba(Si₂O₇)
O	ⓘ Bastnäsite-(Ce)	Ce(CO₃)F
O	ⓘ Bertrandite	Be₄(Si₂O₇)(OH)₂
O	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
O	ⓘ Calcite	CaCO₃
O	ⓘ Eudidymite	Na₂Be₂Si₆O₁₅ · H₂O
O	ⓘ Microcline	K(AlSi₃O₈)
O	ⓘ Nepheline	Na₃K(Al₄Si₄O₁₆)
O	ⓘ Natrolite	Na₂Al₂Si₃O₁₀ · 2H₂O
O	ⓘ Parisite-(Ce)	CaCe₂(CO₃)₃F₂
O	ⓘ Polylithionite	KLi₂Al(Si₄O₁₀)(F,OH)₂
O	ⓘ Zircon	Zr(SiO₄)
O	ⓘ Eudialyte Group	[N(1)N(2)N(3)N(4)N(5)]₃[M(1.1)M(1.2)]₃[M(2.1)M(2.2)M(2.3)]_3-6[M(3)M(4)]Z₃[Si₂₄O₇₂]Θ₄X(1)X(2)
F	Fluorine
F	ⓘ Astrophyllite	K₂NaFe₇²⁺Ti₂Si₈O₂₆(OH)₄F
F	ⓘ Bastnäsite-(Ce)	Ce(CO₃)F
F	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
F	ⓘ Fluorite	CaF₂
F	ⓘ Parisite-(Ce)	CaCe₂(CO₃)₃F₂
F	ⓘ Polylithionite	KLi₂Al(Si₄O₁₀)(F,OH)₂
Na	Sodium
Na	ⓘ Aegirine	NaFe³⁺Si₂O₆
Na	ⓘ Analcime	Na(AlSi₂O₆) · H₂O
Na	ⓘ Astrophyllite	K₂NaFe₇²⁺Ti₂Si₈O₂₆(OH)₄F
Na	ⓘ Eudidymite	Na₂Be₂Si₆O₁₅ · H₂O
Na	ⓘ Nepheline	Na₃K(Al₄Si₄O₁₆)
Na	ⓘ Natrolite	Na₂Al₂Si₃O₁₀ · 2H₂O
Mg	Magnesium
Mg	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Al	Aluminium
Al	ⓘ Analcime	Na(AlSi₂O₆) · H₂O
Al	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Al	ⓘ Microcline	K(AlSi₃O₈)
Al	ⓘ Nepheline	Na₃K(Al₄Si₄O₁₆)
Al	ⓘ Natrolite	Na₂Al₂Si₃O₁₀ · 2H₂O
Al	ⓘ Polylithionite	KLi₂Al(Si₄O₁₀)(F,OH)₂
Si	Silicon
Si	ⓘ Aegirine	NaFe³⁺Si₂O₆
Si	ⓘ Analcime	Na(AlSi₂O₆) · H₂O
Si	ⓘ Apophyllite Group	AB₄[Si₈O₂₂]X · 8H₂O
Si	ⓘ Astrophyllite	K₂NaFe₇²⁺Ti₂Si₈O₂₆(OH)₄F
Si	ⓘ Barylite	Be₂Ba(Si₂O₇)
Si	ⓘ Bertrandite	Be₄(Si₂O₇)(OH)₂
Si	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Si	ⓘ Eudidymite	Na₂Be₂Si₆O₁₅ · H₂O
Si	ⓘ Microcline	K(AlSi₃O₈)
Si	ⓘ Nepheline	Na₃K(Al₄Si₄O₁₆)
Si	ⓘ Natrolite	Na₂Al₂Si₃O₁₀ · 2H₂O
Si	ⓘ Polylithionite	KLi₂Al(Si₄O₁₀)(F,OH)₂
Si	ⓘ Zircon	Zr(SiO₄)
Si	ⓘ Eudialyte Group	[N(1)N(2)N(3)N(4)N(5)]₃[M(1.1)M(1.2)]₃[M(2.1)M(2.2)M(2.3)]_3-6[M(3)M(4)]Z₃[Si₂₄O₇₂]Θ₄X(1)X(2)
S	Sulfur
S	ⓘ Molybdenite	MoS₂
K	Potassium
K	ⓘ Astrophyllite	K₂NaFe₇²⁺Ti₂Si₈O₂₆(OH)₄F
K	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
K	ⓘ Microcline	K(AlSi₃O₈)
K	ⓘ Nepheline	Na₃K(Al₄Si₄O₁₆)
K	ⓘ Polylithionite	KLi₂Al(Si₄O₁₀)(F,OH)₂
Ca	Calcium
Ca	ⓘ Calcite	CaCO₃
Ca	ⓘ Fluorite	CaF₂
Ca	ⓘ Parisite-(Ce)	CaCe₂(CO₃)₃F₂
Ti	Titanium
Ti	ⓘ Astrophyllite	K₂NaFe₇²⁺Ti₂Si₈O₂₆(OH)₄F
Ti	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Fe	Iron
Fe	ⓘ Aegirine	NaFe³⁺Si₂O₆
Fe	ⓘ Astrophyllite	K₂NaFe₇²⁺Ti₂Si₈O₂₆(OH)₄F
Fe	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Sr	Strontium
Sr	ⓘ Ancylite-(Ce)	CeSr(CO₃)₂(OH) · H₂O
Zr	Zirconium
Zr	ⓘ Zircon	Zr(SiO₄)
Mo	Molybdenum
Mo	ⓘ Molybdenite	MoS₂
Ba	Barium
Ba	ⓘ Barylite	Be₂Ba(Si₂O₇)
Ce	Cerium
Ce	ⓘ Ancylite-(Ce)	CeSr(CO₃)₂(OH) · H₂O
Ce	ⓘ Bastnäsite-(Ce)	Ce(CO₃)F
Ce	ⓘ Parisite-(Ce)	CaCe₂(CO₃)₃F₂

Other Regions, Features and Areas containing this locality

Eurasian PlateTectonic Plate

EuropeContinent

Norway

LangesundsfjordenFjord
Oslo Volcanic ProvinceVolcanic Province
⭔Vestfold og Telemark (2020-2023)County

ScandinaviaRegion

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References

Sæbø, Per Christian (1963) Contributions to the mineralogy of Norway. No. 20. The identity of Weibyeite. Norsk Geologisk Tidsskrift [Norwegian Journal of Geology], 43 (4) 441-443

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Eudidymite locality, Lille Arøya, Larvik, Vestfold, NorwayiRegional Level TypesEudidymite localityPegmatite Lille ArøyaIsland LarvikMunicipality VestfoldCounty NorwayCountry function showexplain() { $("#locexplain").toggle(); if (typeof movemap === "function") movemap(); }

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Detailed Mineral List:

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List of minerals arranged by Strunz 10th Edition classification

List of minerals for each chemical element

Other Regions, Features and Areas containing this locality

References

Eudidymite locality, Lille Arøya, Larvik, Vestfold, Norway i
Regional Level Types
Eudidymite locality Pegmatite
Lille Arøya Island
Larvik Municipality
Vestfold County
Norway Country