Giuliani, Gaston, Fallick, Anthony, Rakotondrazafy, Michel, Ohnenstetter, Daniel, Andriamamonjy, Alfred, Ralantoarison, Théogène, Rakotosamizanany, Saholy, Razanatseheno, Marie, Offant, Yohann, Garnier, Virginie, Dunaigre, Christian, Schwarz, Dietmar, Mercier, Alain, Ratrimo, Voahangy, Ralison, Bruno (2007) Oxygen isotope systematics of gem corundum deposits in Madagascar: relevance for their geological origin. Mineralium Deposita, 42 (3) 251-270 doi:10.1007/s00126-006-0105-3

ⓘ Corundum var. Padparadscha

Formula: Al₂O₃

Locality: Didy ruby deposit, Didy, Ambatondrazaka District, Alaotra-Mangoro, Madagascar

ⓘ Corundum var. Ruby

Formula: Al₂O₃

Locality: Didy ruby deposit, Didy, Ambatondrazaka District, Alaotra-Mangoro, Madagascar

ⓘ Corundum var. Sapphire

Formula: Al₂O₃

Localities: Reported from at least 6 localities in this region.

Habit: Rounded nodules

Colour: Blue, yellow

Description: Found about 2015. Cut gemstones to 50 carats produced by 2017. Exceptionally high quality deep blue sapphire equivalent in quality to "Kashmir" sapphire. Fine clean blue stones over 100 carats and some attractive pinkish orange stones over 50 carats

References:

Basel, Switzerland: March 29, 2017 Kashmir-like' sapphires from Madagascar entering the gem trade in large sizes and quantities By Dr. Michael S. Krzemnicki, SSEF , Swiss Gemmological Institute Trade Alert.

Pardieu, Vincent, Vertriest, Wim, Weeramonkhonlert, Vararut, Raynaud, Victoria, Atikarnsakul, Ungkhana, Perkins, Rosey (2017) Sapphires from the Gem Rush Bemainty area, Ambatondrazaka (Madagascar) Research News, Gemological Institute of America.

ⓘ Graphite

Formula: C

Locality: Bemainty, Didy, Ambatondrazaka District, Alaotra-Mangoro, Madagascar

ⓘ Quartz

Formula: SiO₂

Localities:

Didy ruby deposit, Didy, Ambatondrazaka District, Alaotra-Mangoro, Madagascar
Didy, Ambatondrazaka District, Alaotra-Mangoro, Madagascar

References:

Peretti, Adolf, Hahn, Lawrence (2012) Record-breaking Discovery of Ruby and Sapphire at the Didy Mine in Madagascar: Investigating the Source. InColor 21, International Colored Gemstones Association. 22-35

ⓘ Quartz var. Rose Quartz

Formula: SiO₂

References:

Michel Arliguie collection & photo (Photo ID: 946869, old sample)

ⓘ Zircon

Formula: Zr(SiO₄)

Locality: Bemainty, Didy, Ambatondrazaka District, Alaotra-Mangoro, Madagascar

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
ⓘ	Graphite	1.CB.05a	C
Group 4 - Oxides and Hydroxides
ⓘ	Corundum	4.CB.05	Al₂O₃
ⓘ	var. Ruby	4.CB.05	Al₂O₃
ⓘ	var. Sapphire	4.CB.05	Al₂O₃
ⓘ	var. Padparadscha	4.CB.05	Al₂O₃
ⓘ	Quartz	4.DA.05	SiO₂
ⓘ	var. Rose Quartz	4.DA.05	SiO₂
Group 9 - Silicates
ⓘ	Zircon	9.AD.30	Zr(SiO₄)
ⓘ	Beryl var. Aquamarine	9.CJ.05	Be₃Al₂Si₆O₁₈
ⓘ		9.CJ.05	Be₃Al₂(Si₆O₁₈)

List of minerals for each chemical element

Be	Beryllium
Be	ⓘ Beryl var. Aquamarine	Be₃Al₂Si₆O₁₈
Be	ⓘ Beryl	Be₃Al₂(Si₆O₁₈)
C	Carbon
C	ⓘ Graphite	C
O	Oxygen
O	ⓘ Beryl var. Aquamarine	Be₃Al₂Si₆O₁₈
O	ⓘ Beryl	Be₃Al₂(Si₆O₁₈)
O	ⓘ Corundum	Al₂O₃
O	ⓘ Quartz	SiO₂
O	ⓘ Quartz var. Rose Quartz	SiO₂
O	ⓘ Corundum var. Ruby	Al₂O₃
O	ⓘ Corundum var. Sapphire	Al₂O₃
O	ⓘ Zircon	Zr(SiO₄)
O	ⓘ Corundum var. Padparadscha	Al₂O₃
Al	Aluminium
Al	ⓘ Beryl var. Aquamarine	Be₃Al₂Si₆O₁₈
Al	ⓘ Beryl	Be₃Al₂(Si₆O₁₈)
Al	ⓘ Corundum	Al₂O₃
Al	ⓘ Corundum var. Ruby	Al₂O₃
Al	ⓘ Corundum var. Sapphire	Al₂O₃
Al	ⓘ Corundum var. Padparadscha	Al₂O₃
Si	Silicon
Si	ⓘ Beryl var. Aquamarine	Be₃Al₂Si₆O₁₈
Si	ⓘ Beryl	Be₃Al₂(Si₆O₁₈)
Si	ⓘ Quartz	SiO₂
Si	ⓘ Quartz var. Rose Quartz	SiO₂
Si	ⓘ Zircon	Zr(SiO₄)
Zr	Zirconium
Zr	ⓘ Zircon	Zr(SiO₄)

Fossils

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Other Databases

Wikipedia:	https://en.wikipedia.org/wiki/Didy
Wikidata ID:	Q3027268
GeoNames ID:	11927266

Localities in this Region

Madagascar

Alaotra-Mangoro
- Ambatondrazaka District
  - Didy
    - Bemainty
    - Didy ruby deposit

Other Regions, Features and Areas that Intersect

Somali PlateTectonic Plate

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Didy, Ambatondrazaka District, Alaotra-Mangoro, Madagascar i
Regional Level Types
Didy Commune
Ambatondrazaka District District
Alaotra-Mangoro Region
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