A 400m long and 2 m thick folded layer rich in euhedral sapphirine crystals in a lens with various garnet bearing folded migmatites (cordierite-spinel-and garnet-cordierite-hypersthene granofelses). The rock is medium-grained except the sapphirine (about 20 % of the rock) which occurs in about 2 cm long lath-shaped crystals.
The locality is now closed for collecting, protected as area of particular geological interest.

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Standard Detailed Gallery Strunz Chemical Elements

Mineral List

ⓘ Cordierite

8 valid minerals.

Rock Types Recorded

Note: data is currently VERY limited. Please bear with us while we work towards adding this information!

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Alphabetical List Tree Diagram

ⓘ Migmatite

Detailed Mineral List:

ⓘ Cordierite

Formula: (Mg,Fe)₂Al₃(AlSi₅O₁₈)

Description: small grains

References:

Hermans, Gerard A.E.M., Hakstege, Anthonie L., Jansen, J. Ben H., Poorter, René P.E. (1976) Sapphirine occurrence near Vikeså in Rogaland, Southwestern Norway. Norsk Geologisk Tidsskrift [Norwegian Journal of Geology], 56 (4) 397-412

ⓘ Diaspore

Formula: AlO(OH)

Description: Found as retrograde formed along the rims of hercynite grains.

References:

ⓘ Enstatite

Formula: Mg₂Si₂O₆

References:

ⓘ Enstatite var. Bronzite

Formula: (Mg,Fe²⁺)₂[SiO₃]₂

References:

ⓘ Hercynite

Formula: Fe²⁺Al₂O₄

Colour: green

Description: Mg-rich hercynite

References:

ⓘ 'K Feldspar'

Description: perthitic

References:

ⓘ Magnetite

Formula: Fe²⁺Fe³⁺₂O₄

References:

ⓘ Muscovite

Formula: KAl₂(AlSi₃O₁₀)(OH)₂

References:

ⓘ Muscovite var. Sericite

Formula: KAl₂(AlSi₃O₁₀)(OH)₂

References:

ⓘ Phlogopite

Formula: KMg₃(AlSi₃O₁₀)(OH)₂

References:

ⓘ 'Plagioclase'

Formula: (Na,Ca)[(Si,Al)AlSi₂]O₈

References:

ⓘ Sapphirine

Formula: Mg₄(Mg₃Al₉)O₄[Si₃Al₉O₃₆]

Habit: euhedrale prismatic crystals

Description: Crystals often mantled by bronzite

References:

Gallery:

Mg₄(Mg₃Al₉)O₄[Si₃Al₉O₃₆]ⓘ Sapphirine

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
ⓘ	Hercynite	4.BB.05	Fe²⁺Al₂O₄
ⓘ	Magnetite	4.BB.05	Fe²⁺Fe³⁺₂O₄
ⓘ	Diaspore	4.FD.10	AlO(OH)
Group 9 - Silicates
ⓘ	Cordierite	9.CJ.10	(Mg,Fe)₂Al₃(AlSi₅O₁₈)
ⓘ	Enstatite	9.DA.05	Mg₂Si₂O₆
ⓘ	var. Bronzite	9.DA.05	(Mg,Fe²⁺)₂[SiO₃]₂
ⓘ	Sapphirine	9.DH.45	Mg₄(Mg₃Al₉)O₄[Si₃Al₉O₃₆]
ⓘ	Muscovite	9.EC.15	KAl₂(AlSi₃O₁₀)(OH)₂
ⓘ	var. Sericite	9.EC.15	KAl₂(AlSi₃O₁₀)(OH)₂
ⓘ	Phlogopite	9.EC.20	KMg₃(AlSi₃O₁₀)(OH)₂
Unclassified
ⓘ	'Plagioclase'	-	(Na,Ca)[(Si,Al)AlSi₂]O₈
ⓘ	'K Feldspar'	-

List of minerals for each chemical element

H	Hydrogen
H	ⓘ Diaspore	AlO(OH)
H	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
H	ⓘ Phlogopite	KMg₃(AlSi₃O₁₀)(OH)₂
H	ⓘ Muscovite var. Sericite	KAl₂(AlSi₃O₁₀)(OH)₂
O	Oxygen
O	ⓘ Cordierite	(Mg,Fe)₂Al₃(AlSi₅O₁₈)
O	ⓘ Diaspore	AlO(OH)
O	ⓘ Enstatite	Mg₂Si₂O₆
O	ⓘ Hercynite	Fe²⁺Al₂O₄
O	ⓘ Magnetite	Fe²⁺Fe₂³⁺O₄
O	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
O	ⓘ Phlogopite	KMg₃(AlSi₃O₁₀)(OH)₂
O	ⓘ Sapphirine	Mg₄(Mg₃Al₉)O₄[Si₃Al₉O₃₆]
O	ⓘ Enstatite var. Bronzite	(Mg,Fe²⁺)₂[SiO₃]₂
O	ⓘ Muscovite var. Sericite	KAl₂(AlSi₃O₁₀)(OH)₂
O	ⓘ Plagioclase	(Na,Ca)[(Si,Al)AlSi₂]O₈
Na	Sodium
Na	ⓘ Plagioclase	(Na,Ca)[(Si,Al)AlSi₂]O₈
Mg	Magnesium
Mg	ⓘ Cordierite	(Mg,Fe)₂Al₃(AlSi₅O₁₈)
Mg	ⓘ Enstatite	Mg₂Si₂O₆
Mg	ⓘ Phlogopite	KMg₃(AlSi₃O₁₀)(OH)₂
Mg	ⓘ Sapphirine	Mg₄(Mg₃Al₉)O₄[Si₃Al₉O₃₆]
Mg	ⓘ Enstatite var. Bronzite	(Mg,Fe²⁺)₂[SiO₃]₂
Al	Aluminium
Al	ⓘ Cordierite	(Mg,Fe)₂Al₃(AlSi₅O₁₈)
Al	ⓘ Diaspore	AlO(OH)
Al	ⓘ Hercynite	Fe²⁺Al₂O₄
Al	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
Al	ⓘ Phlogopite	KMg₃(AlSi₃O₁₀)(OH)₂
Al	ⓘ Sapphirine	Mg₄(Mg₃Al₉)O₄[Si₃Al₉O₃₆]
Al	ⓘ Muscovite var. Sericite	KAl₂(AlSi₃O₁₀)(OH)₂
Al	ⓘ Plagioclase	(Na,Ca)[(Si,Al)AlSi₂]O₈
Si	Silicon
Si	ⓘ Cordierite	(Mg,Fe)₂Al₃(AlSi₅O₁₈)
Si	ⓘ Enstatite	Mg₂Si₂O₆
Si	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
Si	ⓘ Phlogopite	KMg₃(AlSi₃O₁₀)(OH)₂
Si	ⓘ Sapphirine	Mg₄(Mg₃Al₉)O₄[Si₃Al₉O₃₆]
Si	ⓘ Enstatite var. Bronzite	(Mg,Fe²⁺)₂[SiO₃]₂
Si	ⓘ Muscovite var. Sericite	KAl₂(AlSi₃O₁₀)(OH)₂
Si	ⓘ Plagioclase	(Na,Ca)[(Si,Al)AlSi₂]O₈
K	Potassium
K	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
K	ⓘ Phlogopite	KMg₃(AlSi₃O₁₀)(OH)₂
K	ⓘ Muscovite var. Sericite	KAl₂(AlSi₃O₁₀)(OH)₂
Ca	Calcium
Ca	ⓘ Plagioclase	(Na,Ca)[(Si,Al)AlSi₂]O₈
Fe	Iron
Fe	ⓘ Cordierite	(Mg,Fe)₂Al₃(AlSi₅O₁₈)
Fe	ⓘ Hercynite	Fe²⁺Al₂O₄
Fe	ⓘ Magnetite	Fe²⁺Fe₂³⁺O₄
Fe	ⓘ Enstatite var. Bronzite	(Mg,Fe²⁺)₂[SiO₃]₂

Other Regions, Features and Areas containing this locality

Baltic Shield (Fennoscandian Shield)Shield

Eurasian PlateTectonic Plate

EuropeContinent

ScandinaviaRegion

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References

(n.d.)

Maijer, C. , Hermans, G. A. E. M., Tobi, A. C., Jansen, J. B. H. (1987) Day 8- The metamorphic envelope of the Rogaland intrusive complex (continuation) In The geology of southernmost Norway. An excursion guide - Norges Geologiske Undersøkelse, special publication No. 1. p.81-87.

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