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Marovato, Ambolobozo Commune, Analalava District, Sofia Region, Mahajanga Province (Majunga), Madagascar

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Latitude & Longitude (WGS84): 14° 24' 17'' South , 47° 42' 51'' East
Latitude & Longitude (decimal): -14.40500,47.71417
GeoHash:G#: mj3yjc8ku
Locality type:Outcrop
Köppen climate type:Aw : Tropical savanna, wet
Name(s) in local language(s):Marovato, Kaominin' Ambolobozo, Distrikan' Analalava, Faritr'i Sofia, Faritanin' i Mahajanga, Madagasikara
Other/historical names associated with this locality:Sous-Préfecture d'Analalava


The famous locality for the "Ocean Jasper" or "orbicular jasper". This is not strictly a jasper but a highly silicified rhyolite or tuff.
Located on the north-east coast of Madagascar near the village of Marovato where orbicular quartz is mined that is polished and/or carved and sold as "Ocean Jasper".

Alternative Label Names

This is a list of additional names that have been recorded for mineral labels associated with this locality in the minID database. This may include previous versions of the locality name hierarchy from mindat.org, data entry errors, and it may also include unconfirmed sublocality names or other names that can only be matched to this level.

Marovato, Ambolobozo, Analalava District, Sofia Region, Mahajanga Province (Majunga), Madagascar

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


1 valid mineral. 1 erroneous literature entry.

Detailed Mineral List:

'Orbicular Jasper'
Reference: Lieber, W. (2003): Sphärolithischer Chalcedon von Madagaskar. LAPIS 28 (9), 18-22
Quartz
Formula: SiO2
Reference: karel Bal Collection
Quartz var: Chalcedony
Formula: SiO2
Reference: Lieber, W. (2003): Sphärolithischer Chalcedon von Madagaskar. LAPIS 28 (9), 18-22
Quartz var: Jasper
Description: Used as a tradename but sensu stricto it is not a jasper
Reference: Van King

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
Quartz4.DA.05SiO2
var: Chalcedony4.DA.05SiO2
var: Jasper ?4.DA.05SiO2
Unclassified Minerals, Rocks, etc.
Orbicular Jasper-

List of minerals arranged by Dana 8th Edition classification

Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Rocks, etc.
'Orbicular Jasper'-
Quartz
var: Chalcedony
-SiO2
var: Jasper ?-SiO2

List of minerals for each chemical element

OOxygen
O Quartz (var: Chalcedony)SiO2
O QuartzSiO2
SiSilicon
Si Quartz (var: Chalcedony)SiO2
Si QuartzSiO2

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

Cretaceous
66 - 145 Ma



ID: 3193248
Mesozoic sedimentary and volcanic rocks

Age: Cretaceous (66 - 145 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]

Late Cretaceous
66 - 100.5 Ma



ID: 3306913

Age: Late Cretaceous (66 - 100.5 Ma)

Lithology: Volcanic

Reference: Thiéblemont, D. (ed.). New edition of the 1:10,000,000 geological map of Africa. CGMW-BRGM. [190]

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

References

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Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Lieber, W. (2003) Sphärolithischer Chalcedon von Madagaskar. Lapis, 28(9), 18-22.


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