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Helgustadir Mine, Reydarfjörđur, Eastern Region, Iceland

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Name(s) in local language(s):Helgustaðanáma, Reydarfjörđur, Austfirðir (Austurland), Ísland
Latitude & Longitude (WGS84): 65° 1' 60'' North , 13° 49' 60'' West
Latitude & Longitude (decimal): 65.03333,-13.83333
GeoHash:G#: gew1vnyye
Locality type:Mine
Köppen climate type:ET : Tundra


An occurrence of optical-grade calcite known since 1669. "Iceland spar" was mined in an organized way from 1855. Regular mining ended in 1925. In 1975 the location received the status of a "natural monument" (collecting is strictly forbidden).

Located near Helgustađir farm, 7 km E of Eskifjördur (Eskifjord) town (note, however, that Eskifjördur is also the northern branch of Reydarfjordur and the name of a farm), in Reydarfjord.

The locality is also famous for zeolites, especially stilbite.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


3 valid minerals.

Detailed Mineral List:

Calcite
Formula: CaCO3
Reference: Kristjansson, L. (2002): Iceland spar: The Helgustadir Calcite Locality and its Influence on the Development of Science. Journal of Geoscience Education, 50, 419-426.
Calcite var: Iceland Spar
Formula: CaCO3
Reference: Kristjansson, L. (2002): Iceland spar: The Helgustadir Calcite Locality and its Influence on the Development of Science. Journal of Geoscience Education, 50, 419-426.
'Heulandite subgroup'
Reference: Collcetion of Volker Betz
Laumontite
Formula: CaAl2Si4O12 · 4H2O
Reference: Collcetion of Volker Betz
Quartz
Formula: SiO2
Reference: Collcetion of Volker Betz
'Stilbite subgroup'

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
Quartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
'Calcite'5.AB.05CaCO3
var: Iceland Spar5.AB.05CaCO3
Group 9 - Silicates
Laumontite9.GB.10CaAl2Si4O12 · 4H2O
Unclassified Minerals, Rocks, etc.
'Heulandite subgroup'-
Stilbite subgroup-

List of minerals arranged by Dana 8th Edition classification

Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Group 77 - TECTOSILICATES Zeolites
Zeolite group - True zeolites
Laumontite77.1.1.4CaAl2Si4O12 · 4H2O
Unclassified Minerals, Rocks, etc.
Calcite
var: Iceland Spar
-CaCO3
'Heulandite subgroup'-
'Stilbite subgroup'-

List of minerals for each chemical element

HHydrogen
H LaumontiteCaAl2Si4O12 · 4H2O
CCarbon
C CalciteCaCO3
C Calcite (var: Iceland Spar)CaCO3
OOxygen
O CalciteCaCO3
O Calcite (var: Iceland Spar)CaCO3
O LaumontiteCaAl2Si4O12 · 4H2O
O QuartzSiO2
AlAluminium
Al LaumontiteCaAl2Si4O12 · 4H2O
SiSilicon
Si LaumontiteCaAl2Si4O12 · 4H2O
Si QuartzSiO2
CaCalcium
Ca CalciteCaCO3
Ca Calcite (var: Iceland Spar)CaCO3
Ca LaumontiteCaAl2Si4O12 · 4H2O

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Neogene
2.588 - 23.03 Ma



ID: 3135242
Neogene undifferentiated

Age: Neogene (2.588 - 23.03 Ma)

Lithology: Volcanic

Reference: Asch, K. The 1:5M International Geological Map of Europe and Adjacent Areas: Development and Implementation of a GIS-enabled Concept. Geologisches Jahrbuch, SA 3. [147]

Tertiary
2.588 - 66 Ma



ID: 3185314
Cenozoic volcanic rocks

Age: Cenozoic (2.588 - 66 Ma)

Lithology: Mafic volcanic rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Miocene
5.333 - 23.03 Ma



ID: 651972
Igneous: extrusive; Extrusive: mafic

Age: Miocene (5.333 - 23.03 Ma)

Description: Arctic-North Atlantic region, Iceland, North Atlantic, East Greenland volcanic belt

Comments: Oceanic basin; Koistinen et al., 2001; Sigmond, 2002; Solli, unpublished compilation, 2007-08; Bergman et al., unpublished revisions, 2007-08

Lithology: Basalt, olivine basalt, tholeiite, alkali basalt, basanite, pillow basalt, flood basalt

Reference: J.C. Harrison, M.R. St-Onge, O.V. Petrov, S.I. Strelnikov, B.G. Lopatin, F.H. Wilson, S. Tella, D. Paul, T. Lynds, S.P. Shokalsky, C.K. Hults, S. Bergman, H.F. Jepsen, and A. Solli. Geological map of the Arctic. doi:10.4095/287868. Geological Survey of Canada Map 2159A. [2]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
- Thoroddsen, Th. (1890): Nogle Bemærkninger om de islandske Findesteder for Dobbeltspath. Geologiska Föreningen i Stockholm Förhandlingar 130: 247-254.
- Kristjansson, L. (2002): Iceland spar: The Helgustadir Calcite Locality and its Influence on the Development of Science. Journal of Geoscience Education, 50, 419-426.

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