Thorsmörk ignimbrite is comenditic in composition, is by far the largest peralkaline extrusive occurrence in Iceland and mainly outcrops in the valleys of Thorsmörk area (Jørgensen 1980).

Coordinates are approximate.

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Standard Detailed Gallery Strunz Chemical Elements

Mineral List

11 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

ⓘ Comenditic rhyolite

Detailed Mineral List:

ⓘ Aegirine

Formula: NaFe³⁺Si₂O₆

References:

Jørgensen, K. A. (1980). The Thorsmörk ignimbrite: an unusual comenditic pyroclastic flow in southern Iceland. Journal of Volcanology and Geothermal Research, 8(1), 7-22. doi.org/10.1016/0377-0273(80)90004-9

Jørgensen, K. A. (1987). Mineralogy and petrology of alkaline granophyric xenoliths from the Thorsmörk ignimbrite, southern Iceland. Lithos, 20(2), 153-168. doi.org/10.1016/0024-4937(87)90004-1

ⓘ Aenigmatite

Formula: Na₄[Fe²⁺₁₀Ti₂]O₄[Si₁₂O₃₆]

References:

Jørgensen, K. A. (1987). Mineralogy and petrology of alkaline granophyric xenoliths from the Thorsmörk ignimbrite, southern Iceland. Lithos, 20(2), 153-168. doi.org/10.1016/0024-4937(87)90004-1

ⓘ Albite var. Anorthoclase

Formula: (Na,K)AlSi₃O₈

References:

Jørgensen, K. A. (1987). Mineralogy and petrology of alkaline granophyric xenoliths from the Thorsmörk ignimbrite, southern Iceland. Lithos, 20(2), 153-168. doi.org/10.1016/0024-4937(87)90004-1

ⓘ Arfvedsonite

Formula: [Na][Na₂][Fe²⁺₄Fe³⁺]Si₈O₂₂(OH)₂

References:

Jørgensen, K. A. (1987). Mineralogy and petrology of alkaline granophyric xenoliths from the Thorsmörk ignimbrite, southern Iceland. Lithos, 20(2), 153-168. doi.org/10.1016/0024-4937(87)90004-1

ⓘ Augite

Formula: (Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆

References:

Jørgensen, K. A. (1987). Mineralogy and petrology of alkaline granophyric xenoliths from the Thorsmörk ignimbrite, southern Iceland. Lithos, 20(2), 153-168. doi.org/10.1016/0024-4937(87)90004-1

ⓘ Augite var. Ferrohedenbergite

Formula: (Ca,Mg,Fe)(Fe,Mg)Si₂O₆

References:

Jørgensen, K. A. (1987). Mineralogy and petrology of alkaline granophyric xenoliths from the Thorsmörk ignimbrite, southern Iceland. Lithos, 20(2), 153-168. doi.org/10.1016/0024-4937(87)90004-1

ⓘ 'Chevkinite Group'

References:

Jørgensen, K. A. (1987). Mineralogy and petrology of alkaline granophyric xenoliths from the Thorsmörk ignimbrite, southern Iceland. Lithos, 20(2), 153-168. doi.org/10.1016/0024-4937(87)90004-1

ⓘ Diopside

Formula: CaMgSi₂O₆

References:

Jørgensen, K. A. (1987). Mineralogy and petrology of alkaline granophyric xenoliths from the Thorsmörk ignimbrite, southern Iceland. Lithos, 20(2), 153-168. doi.org/10.1016/0024-4937(87)90004-1

ⓘ Diopside var. Salite

References:

Jørgensen, K. A. (1987). Mineralogy and petrology of alkaline granophyric xenoliths from the Thorsmörk ignimbrite, southern Iceland. Lithos, 20(2), 153-168. doi.org/10.1016/0024-4937(87)90004-1

ⓘ Fayalite

Formula: Fe²⁺₂SiO₄

References:

Jørgensen, K. A. (1987). Mineralogy and petrology of alkaline granophyric xenoliths from the Thorsmörk ignimbrite, southern Iceland. Lithos, 20(2), 153-168. doi.org/10.1016/0024-4937(87)90004-1

ⓘ Fluorite

Formula: CaF₂

References:

Jørgensen, K. A. (1987). Mineralogy and petrology of alkaline granophyric xenoliths from the Thorsmörk ignimbrite, southern Iceland. Lithos, 20(2), 153-168. doi.org/10.1016/0024-4937(87)90004-1

ⓘ Hedenbergite

Formula: CaFe²⁺Si₂O₆

References:

Jørgensen, K. A. (1987). Mineralogy and petrology of alkaline granophyric xenoliths from the Thorsmörk ignimbrite, southern Iceland. Lithos, 20(2), 153-168. doi.org/10.1016/0024-4937(87)90004-1

ⓘ Ilmenite

Formula: Fe²⁺TiO₃

References:

Jørgensen, K. A. (1987). Mineralogy and petrology of alkaline granophyric xenoliths from the Thorsmörk ignimbrite, southern Iceland. Lithos, 20(2), 153-168. doi.org/10.1016/0024-4937(87)90004-1

ⓘ Magnetite

Formula: Fe²⁺Fe³⁺₂O₄

References:

Jørgensen, K. A. (1987). Mineralogy and petrology of alkaline granophyric xenoliths from the Thorsmörk ignimbrite, southern Iceland. Lithos, 20(2), 153-168. doi.org/10.1016/0024-4937(87)90004-1

ⓘ 'Pyrochlore Group'

Formula: A₂Nb₂(O,OH)₆Z

References:

Jørgensen, K. A. (1987). Mineralogy and petrology of alkaline granophyric xenoliths from the Thorsmörk ignimbrite, southern Iceland. Lithos, 20(2), 153-168. doi.org/10.1016/0024-4937(87)90004-1

ⓘ Zircon

Formula: Zr(SiO₄)

References:

Jørgensen, K. A. (1987). Mineralogy and petrology of alkaline granophyric xenoliths from the Thorsmörk ignimbrite, southern Iceland. Lithos, 20(2), 153-168. doi.org/10.1016/0024-4937(87)90004-1

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 3 - Halides
ⓘ	Fluorite	3.AB.25	CaF₂
Group 4 - Oxides and Hydroxides
ⓘ	'Pyrochlore Group'	4.00.	A₂Nb₂(O,OH)₆Z
ⓘ	Magnetite	4.BB.05	Fe²⁺Fe³⁺₂O₄
ⓘ	Ilmenite	4.CB.05	Fe²⁺TiO₃
Group 9 - Silicates
ⓘ	Fayalite	9.AC.05	Fe²⁺₂SiO₄
ⓘ	Zircon	9.AD.30	Zr(SiO₄)
ⓘ	Augite	9.DA.15	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
ⓘ	Diopside	9.DA.15	CaMgSi₂O₆
ⓘ	Hedenbergite	9.DA.15	CaFe²⁺Si₂O₆
ⓘ	Diopside var. Salite	9.DA.15	CaMgSi₂O₆
ⓘ	Augite var. Ferrohedenbergite	9.DA.15	(Ca,Mg,Fe)(Fe,Mg)Si₂O₆
ⓘ	Aegirine	9.DA.25	NaFe³⁺Si₂O₆
ⓘ	Arfvedsonite	9.DE.25	[Na][Na₂][Fe²⁺₄Fe³⁺]Si₈O₂₂(OH)₂
ⓘ	Aenigmatite	9.DH.40	Na₄[Fe²⁺₁₀Ti₂]O₄[Si₁₂O₃₆]
ⓘ	Albite var. Anorthoclase	9.FA.35	(Na,K)AlSi₃O₈
Unclassified
ⓘ	'Chevkinite Group'	-

List of minerals for each chemical element

H	Hydrogen
H	ⓘ Arfvedsonite	[Na][Na₂][Fe₄²⁺Fe³⁺]Si₈O₂₂(OH)₂
H	ⓘ Pyrochlore Group	A₂Nb₂(O,OH)₆Z
O	Oxygen
O	ⓘ Aegirine	NaFe³⁺Si₂O₆
O	ⓘ Aenigmatite	Na₄[Fe₁₀²⁺Ti₂]O₄[Si₁₂O₃₆]
O	ⓘ Albite var. Anorthoclase	(Na,K)AlSi₃O₈
O	ⓘ Arfvedsonite	[Na][Na₂][Fe₄²⁺Fe³⁺]Si₈O₂₂(OH)₂
O	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
O	ⓘ Diopside	CaMgSi₂O₆
O	ⓘ Fayalite	Fe₂²⁺SiO₄
O	ⓘ Hedenbergite	CaFe²⁺Si₂O₆
O	ⓘ Ilmenite	Fe²⁺TiO₃
O	ⓘ Magnetite	Fe²⁺Fe₂³⁺O₄
O	ⓘ Pyrochlore Group	A₂Nb₂(O,OH)₆Z
O	ⓘ Zircon	Zr(SiO₄)
O	ⓘ Augite var. Ferrohedenbergite	(Ca,Mg,Fe)(Fe,Mg)Si₂O₆
F	Fluorine
F	ⓘ Fluorite	CaF₂
Na	Sodium
Na	ⓘ Aegirine	NaFe³⁺Si₂O₆
Na	ⓘ Aenigmatite	Na₄[Fe₁₀²⁺Ti₂]O₄[Si₁₂O₃₆]
Na	ⓘ Albite var. Anorthoclase	(Na,K)AlSi₃O₈
Na	ⓘ Arfvedsonite	[Na][Na₂][Fe₄²⁺Fe³⁺]Si₈O₂₂(OH)₂
Mg	Magnesium
Mg	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
Mg	ⓘ Diopside	CaMgSi₂O₆
Mg	ⓘ Augite var. Ferrohedenbergite	(Ca,Mg,Fe)(Fe,Mg)Si₂O₆
Al	Aluminium
Al	ⓘ Albite var. Anorthoclase	(Na,K)AlSi₃O₈
Si	Silicon
Si	ⓘ Aegirine	NaFe³⁺Si₂O₆
Si	ⓘ Aenigmatite	Na₄[Fe₁₀²⁺Ti₂]O₄[Si₁₂O₃₆]
Si	ⓘ Albite var. Anorthoclase	(Na,K)AlSi₃O₈
Si	ⓘ Arfvedsonite	[Na][Na₂][Fe₄²⁺Fe³⁺]Si₈O₂₂(OH)₂
Si	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
Si	ⓘ Diopside	CaMgSi₂O₆
Si	ⓘ Fayalite	Fe₂²⁺SiO₄
Si	ⓘ Hedenbergite	CaFe²⁺Si₂O₆
Si	ⓘ Zircon	Zr(SiO₄)
Si	ⓘ Augite var. Ferrohedenbergite	(Ca,Mg,Fe)(Fe,Mg)Si₂O₆
K	Potassium
K	ⓘ Albite var. Anorthoclase	(Na,K)AlSi₃O₈
Ca	Calcium
Ca	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
Ca	ⓘ Diopside	CaMgSi₂O₆
Ca	ⓘ Fluorite	CaF₂
Ca	ⓘ Hedenbergite	CaFe²⁺Si₂O₆
Ca	ⓘ Augite var. Ferrohedenbergite	(Ca,Mg,Fe)(Fe,Mg)Si₂O₆
Ti	Titanium
Ti	ⓘ Aenigmatite	Na₄[Fe₁₀²⁺Ti₂]O₄[Si₁₂O₃₆]
Ti	ⓘ Ilmenite	Fe²⁺TiO₃
Fe	Iron
Fe	ⓘ Aegirine	NaFe³⁺Si₂O₆
Fe	ⓘ Aenigmatite	Na₄[Fe₁₀²⁺Ti₂]O₄[Si₁₂O₃₆]
Fe	ⓘ Arfvedsonite	[Na][Na₂][Fe₄²⁺Fe³⁺]Si₈O₂₂(OH)₂
Fe	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
Fe	ⓘ Fayalite	Fe₂²⁺SiO₄
Fe	ⓘ Hedenbergite	CaFe²⁺Si₂O₆
Fe	ⓘ Ilmenite	Fe²⁺TiO₃
Fe	ⓘ Magnetite	Fe²⁺Fe₂³⁺O₄
Fe	ⓘ Augite var. Ferrohedenbergite	(Ca,Mg,Fe)(Fe,Mg)Si₂O₆
Zr	Zirconium
Zr	ⓘ Zircon	Zr(SiO₄)
Nb	Niobium
Nb	ⓘ Pyrochlore Group	A₂Nb₂(O,OH)₆Z

Other Databases

Wikipedia:	https://en.wikipedia.org/wiki/Th%C3%B3rsm%C3%B6rk
Wikidata ID:	Q138114

Other Regions, Features and Areas containing this locality

Eurasian PlateTectonic Plate

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References

Jørgensen, K. A. (1987). Mineralogy and petrology of alkaline granophyric xenoliths from the Thorsmörk ignimbrite, southern Iceland. Lithos, 20(2), 153-168. doi.org/10.1016/0024-4937(87)90004-1

Woolley, Alan R. (2019) Alkaline Rocks and Carbonatites of the World. Part 4: Antarctica, Asia and Europe (excluding the former USSR), Australasia and Oceanic Islands. The Geological Society of London. doi:10.1144/mpar4

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