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Sakoany deposit, Katsepy Commune, Mitsinjo District, Boeny, Madagascari
Regional Level Types
Sakoany depositDeposit
Katsepy CommuneCommune
Mitsinjo DistrictDistrict

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Name(s) in local language(s):Sakoany (Sankoany), Kaominina Katsepy, Distrikan' i Mitsinjo, Faritra Boeny, Faritanin' i Mahajanga, Madagasikara
Latitude & Longitude (WGS84): 15° 51' 18'' South , 46° 13' 50'' East
Latitude & Longitude (decimal): -15.85500,46.23056
GeoHash:G#: mj0vu18jf
Locality type:Deposit
Köppen climate type:Aw : Tropical savanna, wet
Nearest Settlements:
Mahajanga154,657 (2018)17.9km

A famous locality that has produced tons of magnificent celestine specimens. It is located near the village of Sakoany, on the western side of the banks of the Betsiboka River (where it empties into the Bombetoka Bay), at the northwestern coast of Madagascar. It is further located about 12 km south of Katsepy, the nearest administrative centre.

The celestine-bearing layer is found in a maximum 30 m thick lens between layers of crinoidal limestones and sandy greywacke of the Danien period (Jurassic, 65 million years old). The celestine occurs mainly as 2 different types: as geodes in varying sizes [Ratsimabazafy (1973) reported a geode about 60 cm in diameter and weighing 54 kg], and as crystal clusters up to 15 cm in diameter. The yearly production is about 15 tons (Pezzotta 1999).

The celestine was first discovered in 1967 and the diggings first started close to the seashore. Later they moved some hundreds of meters away to a higher level (+ 15 m). The locality consists of numerous small, irregular, up to 15 m deep holes in the ground.

Regions containing this locality

Somali Plate (Somalia Plate)Tectonic Plate
Mahajanga Province (Majunga), MadagascarProvince

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List

1 valid mineral.

Detailed Mineral List:

Formula: SrSO4
Habit: Blocky to elongated, tapering and pointed, sharp wellformed crystals to 15 cm. Dominant forms: prism {210} moodified by {101} and {011}, + these and {100},{001},{111},{110}
Colour: Medium blue to pale blue to colorless with a bright luster
Reference: Humbert and Labumaz (1982): La célestite de Madagascar. Monde et Mínéraux 49 (septembre-octobre 1982): 4-7; Pezzotta, F. (1999): Madagaskar. Das Paradies der Mineralien und Edelsteine. Extra Lapis nr 17, pp 53-54 (german edition)

List of minerals arranged by Strunz 10th Edition classification

Group 7 - Sulphates, Chromates, Molybdates and Tungstates

List of minerals arranged by Dana 8th Edition classification


List of minerals for each chemical element

O CelestineSrSO4
S CelestineSrSO4
Sr CelestineSrSO4

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

Pleistocene - Paleogene
0.0117 - 66 Ma

ID: 3308765

Age: Cenozoic (0.0117 - 66 Ma)

Lithology: Sedimentary

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

66 - 145 Ma

ID: 3186497
Mesozoic sedimentary rocks

Age: Cretaceous (66 - 145 Ma)

Lithology: Sedimentary 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


Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Besaire, H. (1972) Géologie de Madagascar. I. Les terrains sédimentaires. Annales Géologiques de Madagascar, 35, 203 [a short notice].
Ratsimbazafy, J. R. (1973) Quelques considérations sur le gisement de celestite de Sakoany. Rapport annuel du Service Géologique de Madagascar, Antananarivo, 125-130.
Humbert and Labumaz (1982) La célestite de Madagascar. Monde et Minéraux, 49 (septembre-octobre 1982), 4-7.
Pezzotta, F. (1999) Madagaskar. Das Paradies der Mineralien und Edelsteine. Extra Lapis, 17, 88-89 [German edition].
Wilson, W.E. (2010) The Sakoany Celestine Deposit. Mineralogical Record, 41, 405-416.

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