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Loučná, Ostrov, Karlovy Vary District, Karlovy Vary Region, Czech Republici
Regional Level Types
Loučná- not defined -
OstrovMunicipality
Karlovy Vary DistrictDistrict
Karlovy Vary RegionRegion
Czech RepublicCountry

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Key
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Latitude & Longitude (WGS84):
50° 24' 59'' North , 12° 58' 49'' East
Latitude & Longitude (decimal):
Köppen climate type:
Nearest Settlements:
PlacePopulationDistance
Kurort Oberwiesenthal2,592 (2016)0.9km
Boží Dar244 (2018)4.0km
Kovářská1,320 (2018)5.7km
Jáchymov3,143 (2018)7.2km
Krásný Les180 (2018)8.1km
Name(s) in local language(s):
Karlovarský Kraj


Surrounding of locality is composed of relicts of denuded tertiary vulcanites in mica schists of the Klínovec series. Loučná body is petrographically mostly nephelinite and its differenciates (olivinic, glassy, sodalitic, leucitic and doleritic nephelinites). Phenocrysts are pyroxenes (augite, titanaugite and aegirinaugite), biotite, titanite, perovskite, apatite and rarely melanite. Mineralogically interesting are vein rocks of phonolite composition with large pseudomophs after leucite. Those are often 3 to 10 cm large, composed of white of yellowish mass of approximately 80 % K-feldspar (sanidine or adulare) and 20 % illite.

Due to building jobs in village, are there some time-limited outcrops, where the various varietes of nephelinite are exposed. In xenolites biotite, pyrite and carbonates occure. Nephelinites contain somewhere small vugs with crystals of analcime and rarely natrolite.

Pseudoleucite: a pseudomorph after leucite consisting of a mixture of nepheline, orthoclase, and analcime likes as fine feldspar crystals and nice specimens from classic locality.

Regions containing this locality

Eurasian PlateTectonic Plate
EuropeContinent
CzechoslovakiaCountry (Former)
Bohemian MassifMassif
Bohemia (Böhmen; Boehmen), Czech RepublicRegion (Historical)
Erzgebirge / Krusné Hory Mts (Ore Mts), Germany & Czech RepublicMining District

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


7 valid minerals.

Detailed Mineral List:

Analcime
Formula: Na(AlSi2O6) · H2O
Habit: trapezohedrons
Colour: white
Description: clear to milky white trapezohedron crystals in almond-shaped vugs. The biggest crystals have 10 mm
Reference: Roman Gramblička
'Biotite'
Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Habit: pseudohexagonal tabular and sheet crystals
Colour: dark brown to black
Description: mica´s sheets to 20 mm are common in xenolites and some types of volcanic rock
Reference: Roman Gramblička
Calcite
Formula: CaCO3
Habit: prismatic
Colour: colorless, white
Description: small prismatic crystals to 4mm, found in vugs with analcime, as small rhombs in pale xenolites
Reference: Roman Gramblička
Dolomite
Formula: CaMg(CO3)2
Colour: white to tan
Description: grains, aggregates and rhombic crystals to 3mm in xenolites
Reference: Roman Gramblička
'Feldspar Group'
Reference: Martins da Pedra.
Leucite
Formula: K(AlSi2O6)
Reference: Pauliš, P.: Nejzajímavější mineralogická naleziště Čech II. Kutná Hora: Kuttna, 2003, s. 17 - 18.
Natrolite
Formula: Na2Al2Si3O10 · 2H2O
Habit: prismatic
Colour: white
Description: small prismatic crystals, max 3x1mm, found in one vug with analcime
Reference: Roman Gramblička
Perovskite
Formula: CaTiO3
Reference: No reference listed
'Pseudoleucite'
Reference: Pivec, E. and ULrych, J. 1982. Pseudoleucite from Loucná (Oberwiesenthal), Krusné, Hory Mtns. (Erzgebirge), Czechosolovakia. Neues Jb. Min. Mh. 1982, 227-236.
Pyrite
Formula: FeS2
Habit: cubes to pentagondodecahedrons, grains
Colour: light yellow
Description: common in pale xenolites, as inclusions, grains, crystals (to 2mm) and their clusters, together with carbonates and feldspars
Reference: Roman Gramblička

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Pyrite2.EB.05aFeS2
Group 4 - Oxides and Hydroxides
Perovskite4.CC.30CaTiO3
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Dolomite5.AB.10CaMg(CO3)2
Group 9 - Silicates
Analcime9.GB.05Na(AlSi2O6) · H2O
Leucite9.GB.05K(AlSi2O6)
Natrolite9.GA.05Na2Al2Si3O10 · 2H2O
Unclassified Minerals, Rocks, etc.
'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
'Feldspar Group'-
'Pseudoleucite'-

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 4 - SIMPLE OXIDES
A2X3
Perovskite4.3.3.1CaTiO3
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
AB(XO3)2
Dolomite14.2.1.1CaMg(CO3)2
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework Feldspathoids and related species
Leucite76.2.2.1K(AlSi2O6)
Group 77 - TECTOSILICATES Zeolites
Zeolite group - True zeolites
Analcime77.1.1.1Na(AlSi2O6) · H2O
Natrolite77.1.5.1Na2Al2Si3O10 · 2H2O
Unclassified Minerals, Mixtures, etc.
'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
'Feldspar Group'-
'Pseudoleucite'-

List of minerals for each chemical element

HHydrogen
H AnalcimeNa(AlSi2O6) · H2O
H NatroliteNa2Al2Si3O10 · 2H2O
H BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
CCarbon
C DolomiteCaMg(CO3)2
C CalciteCaCO3
OOxygen
O PerovskiteCaTiO3
O LeuciteK(AlSi2O6)
O DolomiteCaMg(CO3)2
O AnalcimeNa(AlSi2O6) · H2O
O NatroliteNa2Al2Si3O10 · 2H2O
O BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
O CalciteCaCO3
FFluorine
F BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
NaSodium
Na AnalcimeNa(AlSi2O6) · H2O
Na NatroliteNa2Al2Si3O10 · 2H2O
MgMagnesium
Mg DolomiteCaMg(CO3)2
Mg BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
AlAluminium
Al LeuciteK(AlSi2O6)
Al AnalcimeNa(AlSi2O6) · H2O
Al NatroliteNa2Al2Si3O10 · 2H2O
Al BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
SiSilicon
Si LeuciteK(AlSi2O6)
Si AnalcimeNa(AlSi2O6) · H2O
Si NatroliteNa2Al2Si3O10 · 2H2O
Si BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
SSulfur
S PyriteFeS2
KPotassium
K LeuciteK(AlSi2O6)
K BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
CaCalcium
Ca PerovskiteCaTiO3
Ca DolomiteCaMg(CO3)2
Ca CalciteCaCO3
TiTitanium
Ti PerovskiteCaTiO3
FeIron
Fe BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Fe PyriteFeS2

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

Tertiary
2.588 - 66 Ma



ID: 2602959

Age: Cenozoic (2.588 - 66 Ma)

Description: effusive rock: lava

Comments: Also some occurrences with trachyte, phonolite, latite

Lithology: Alkali basalt, basanite, tephrite, nephelinite, tholeiitic basalt, olivine basalt, andesite

Reference: Toloczyki, M., P. Trurnit, A. Voges, H. Wittekindt, A. Zitzmann. Geological Map of Germany 1:M. Bundesanstalt für Geowissenschaften und Rohstoffe. [94]

Precambrian
541 - 4000 Ma



ID: 3139782
Precambrian schist

Age: Precambrian (541 - 4000 Ma)

Description: high grade metamorphic

Lithology: Major:{schist group}, Minor{gneiss,migmatite/anatexite,amphibolite}

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]

Neoproterozoic
541 - 1000 Ma



ID: 3188473
Neoproterozoic crystalline metamorphic rocks

Age: Neoproterozoic (541 - 1000 Ma)

Lithology: Crystalline metamorphic 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]

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)
Pivec, E., Ulrych, J., Langrová, A., (2004). On the origin of pseudoleucite from Cenozoic phonolite dyke from Loučná/Böhmisch Oberwiesenthal, Krušné hory/Erzgebirge Mts., Bohemia. Neues Jahrbuch für Mineralogie. Abhandlungen 179, 221–238.
Cornelis Klein, Cornelius S. Hurlbut, Jr. (2008). "Manual de Mineralogía" (Dana´s reference book based), Vol. 2, fourth edition, Editorial Reverté, México.(Pseudoleucite) pp. 603-604.


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