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On-dan, Mogok Township, Pyin-Oo-Lwin District, Mandalay Region, Myanmari
Regional Level Types
On-dan- not defined -
Mogok TownshipTownship
Pyin-Oo-Lwin DistrictDistrict
Mandalay RegionRegion
MyanmarCountry

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Key
Latitude & Longitude (WGS84):
22° North , 96° East (est.)
Estimate based on other nearby localities or region boundaries.
Margin of Error:
~31km
Other/historical names associated with this locality:
Burma


The general area is located 58 km NW of Mogok township, encompassing an area of ~36 square kilometers, bordering from 96°12'30"E. to 96°15'45"E. and from 22°55'00"N. to 23°00'00"E. and elevation ranging from 930 to 1,460 m ASL.
The occurrence of the sapphires has been known since the 1940s. The principal rocks are leucogranite, biotite microgranite, augite granite, diorite, syenite, ruby-bearing marble, pure marble, diopside marble, calc-silicate rocks, and gneiss.

Most of the blue sapphires are large in size, but low in quality and appear more "drier" than those sapphires found at Yadanar-kaday-kadar, Kyauk-Pyat-That and elsewhere on Mogok. The best sapphires from On-dan (with few exceptions) can be marketed as commercial-grade cabochons of low value. Very few sapphires are of good faceting grade. Spinel, almandine, garnet, schorl, and quartz are found in the general area.
- Ted Themelis (2008) Gems and Mines of Mogok.

Regions containing this locality

Eurasian PlateTectonic Plate
AsiaContinent

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List

Mineral list contains entries from the region specified including sub-localities

8 valid minerals.

Detailed Mineral List:

Almandine
Formula: Fe2+3Al2(SiO4)3
Chondrodite
Formula: (Mg,Fe2+)5(SiO4)2(F,OH)2
Reference: Ted Themelis (2008) Gems & mines of Mogok
Corundum
Formula: Al2O3
Corundum var: Sapphire
Formula: Al2O3
Elbaite
Formula: Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
Reference: Jordi Fabre
Quartz
Formula: SiO2
Reference: Ted Themelis (2008) Gems & mines of Mogok
Schorl
Formula: Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Spinel
Formula: MgAl2O4
Reference: Ted Themelis (2008) Gems & mines of Mogok
Thorite
Formula: Th(SiO4)
Reference: Ted Themelis (2008) Gems & mines of Mogok
'Tourmaline'
Formula: A(D3)G6(Si6O18)(BO3)3X3Z
Reference: Jordi Fabre
'Tourmaline var: Rubellite'
Formula: A(D3)G6(T6O18)(BO3)3X3Z
Reference: Jordi Fabre

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
Corundum4.CB.05Al2O3
var: Sapphire4.CB.05Al2O3
Quartz4.DA.05SiO2
Spinel4.BB.05MgAl2O4
Group 9 - Silicates
Almandine9.AD.25Fe2+3Al2(SiO4)3
Chondrodite9.AF.45(Mg,Fe2+)5(SiO4)2(F,OH)2
Elbaite9.CK.05Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
Schorl9.CK.05Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Thorite9.AD.30Th(SiO4)
Unclassified Minerals, Rocks, etc.
'Tourmaline'-A(D3)G6(Si6O18)(BO3)3X3Z
'var: Rubellite'-A(D3)G6(T6O18)(BO3)3X3Z

List of minerals arranged by Dana 8th Edition classification

Group 4 - SIMPLE OXIDES
A2X3
Corundum4.3.1.1Al2O3
Group 7 - MULTIPLE OXIDES
AB2X4
Spinel7.2.1.1MgAl2O4
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with cations in [6] and >[6] coordination
Almandine51.4.3a.2Fe2+3Al2(SiO4)3
Insular SiO4 Groups Only with cations in >[6] coordination
Thorite51.5.2.3Th(SiO4)
Group 52 - NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] coordination only
Chondrodite52.3.2b.2(Mg,Fe2+)5(SiO4)2(F,OH)2
Group 61 - CYCLOSILICATES Six-Membered Rings
Six-Membered Rings with borate groups
Elbaite61.3.1.8Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
Schorl61.3.1.10Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Mixtures, etc.
Corundum
var: Sapphire
-Al2O3
'Tourmaline'-A(D3)G6(Si6O18)(BO3)3X3Z
'var: Rubellite'-A(D3)G6(T6O18)(BO3)3X3Z

List of minerals for each chemical element

HHydrogen
H SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
H ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
LiLithium
Li ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
BBoron
B SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
B ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
B Tourmaline (var: Rubellite)A(D3)G6(T6O18)(BO3)3X3Z
B TourmalineA(D3)G6(Si6O18)(BO3)3X3Z
OOxygen
O AlmandineFe32+Al2(SiO4)3
O Corundum (var: Sapphire)Al2O3
O ThoriteTh(SiO4)
O SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
O Chondrodite(Mg,Fe2+)5(SiO4)2(F,OH)2
O QuartzSiO2
O SpinelMgAl2O4
O ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
O Tourmaline (var: Rubellite)A(D3)G6(T6O18)(BO3)3X3Z
O CorundumAl2O3
O TourmalineA(D3)G6(Si6O18)(BO3)3X3Z
FFluorine
F Chondrodite(Mg,Fe2+)5(SiO4)2(F,OH)2
NaSodium
Na SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Na ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
MgMagnesium
Mg Chondrodite(Mg,Fe2+)5(SiO4)2(F,OH)2
Mg SpinelMgAl2O4
AlAluminium
Al AlmandineFe32+Al2(SiO4)3
Al Corundum (var: Sapphire)Al2O3
Al SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Al SpinelMgAl2O4
Al ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
Al CorundumAl2O3
SiSilicon
Si AlmandineFe32+Al2(SiO4)3
Si ThoriteTh(SiO4)
Si SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Si Chondrodite(Mg,Fe2+)5(SiO4)2(F,OH)2
Si QuartzSiO2
Si ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
Si TourmalineA(D3)G6(Si6O18)(BO3)3X3Z
FeIron
Fe AlmandineFe32+Al2(SiO4)3
Fe SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
ThThorium
Th ThoriteTh(SiO4)

References

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Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Ted Themelis (2008) Gems and Mines of Mogok.

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