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Star garnet locality, Ambatosoratra Commune, Ambatondrazaka District, Alaotra-Mangoro, Madagascari
| Regional Level Types | |
|---|---|
| Star garnet locality | Pegmatite |
| Ambatosoratra Commune | Commune |
| Ambatondrazaka District | District |
| Alaotra-Mangoro | Region |
| Madagascar | Country |
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A pegmatite located about 25 km NE of the town of Ambatondrazaka (in the Ambatosoratra Commune). Almandine material displaying a nice asterism (so-called "star garnet") was found here in 1997.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| โ Almandine Formula: Fe2+3Al2(SiO4)3 Habit: Dominant form is {110}, but strongly distorted trigonal crystals with {211} and {431} as dominant forms with {221} and {111} has also been observed |
| โ 'K Feldspar' |
| โ Muscovite Formula: KAl2(AlSi3O10)(OH)2 |
| โ Quartz Formula: SiO2 |
| โ Schorl Formula: NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH) |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| โ | Quartz | 4.DA.05 | SiO2 |
| Group 9 - Silicates | |||
| โ | Almandine | 9.AD.25 | Fe2+3Al2(SiO4)3 |
| โ | Schorl | 9.CK.05 | NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH) |
| โ | Muscovite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
| Unclassified | |||
| โ | 'K Feldspar' | - | |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | โ Muscovite | KAl2(AlSi3O10)(OH)2 |
| H | โ Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| B | Boron | |
| B | โ Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| O | Oxygen | |
| O | โ Almandine | Fe32+Al2(SiO4)3 |
| O | โ Muscovite | KAl2(AlSi3O10)(OH)2 |
| O | โ Quartz | SiO2 |
| O | โ Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| Na | Sodium | |
| Na | โ Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| Al | Aluminium | |
| Al | โ Almandine | Fe32+Al2(SiO4)3 |
| Al | โ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Al | โ Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| Si | Silicon | |
| Si | โ Almandine | Fe32+Al2(SiO4)3 |
| Si | โ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Si | โ Quartz | SiO2 |
| Si | โ Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| K | Potassium | |
| K | โ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Fe | Iron | |
| Fe | โ Almandine | Fe32+Al2(SiO4)3 |
| Fe | โ Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
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