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Chaung-gyi, Mogok Township, Pyin-Oo-Lwin District, Mandalay Region, Myanmar

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Location is approximate, estimate based on other nearby localities.
 
Latitude & Longitude (WGS84): 22° North , 96° East (est.)
Margin of Error:~11km
Köppen climate type:Cwa : Monsoon-influenced humid subtropical climate
Other/historical names associated with this locality:Burma


The general area of Chaung-gyi (Big Stream) is situated about 7 km from Mogok township and it is only accessible by 4-wheel drive vehicle. The long, narrow Chaung-gyi valley runs from south-west to nort-heast. The Chaung-gyi-chaung is the main stream and flows south-west to north-east into the lowlands of Momeik.
The area is composed of igneous rocks (leucogranite, syenite), and metamorphic rocks (marble, calc-silicate, gneiss). The calc-silicate rocks are tightly folded and minor drag foldings are observed. The metamorphic rocks are often faulted and intruded by leucogranite and syenite. The Lisu, Shan, Nepali/Gurkha and Palaung ethnic minorities live in the Chaung-gyi valley in separate villages, and work in the numerous MGE-joint venture mines situated nearby. In 1999 there were about 50 legal joint ventures in and around Chaung-gyi, employing more than 1.000 miners working on the valley floor in one daylight shift. Some illicit mining takes place on the adjacent hillsides.
Gem mining is carried out through myaw-dwin, lebin-dwin and open-pit methods. The gems are found in the secondary deposits (mostly alluvium at the valley floor), as well as at the adjacent primary deposits (marbles, skarns and pegmatites). The stream supplies the water required for washing the gems found in the valley. Many gems and minerals including pitchblende, a radioactive mineral, are found at Chaung-gyi. - Ted Themelis (2008) Gems and Mines of Mogok

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Standard Detailed Strunz Dana Chemical Elements

Mineral List

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

13 valid minerals. 1 (TL) - type locality of valid minerals.

Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

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

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Alphabetical List Tree Diagram

Detailed Mineral List:

Almandine
Formula: Fe2+3Al2(SiO4)3
Beryl
Formula: Be3Al2(Si6O18)
Beryl var: Aquamarine
Formula: Be3Al2Si6O18
Beryl var: Goshenite
Formula: Be3Al2(Si6O18)
Cordierite
Formula: (Mg,Fe)2Al3(AlSi5O18)
Cordierite var: Iolite
Formula: (Mg,Fe)2Al3(AlSi5O18)
Corundum
Formula: Al2O3
Corundum var: Ruby
Formula: Al2O3
Localities: Reported from at least 6 localities in this region.
Corundum var: Sapphire
Formula: Al2O3
Corundum var: Star Ruby
Formula: Al2O3
Corundum var: Star Sapphire
Formula: Al2O3
Kornerupine
Formula: Mg3Al6(Si,Al,B)5O21(OH)
Kyawthuite (TL)
Formula: Bi3+Sb5+O4
Reference: Kampf, A.R., Rosman, G.R., Ma, C. (2016): Kyawthuite, Bi3+Sb5+O4, a new gem mineral from Mogok, Burma (Myanmar). Mineralogical Magazine: 81: 477-484
'Lapis lazuli'
Magnesiotaaffeite-2N’2S
Formula: Mg3Al8BeO16
Reference: Harald Schillhammer collection
'Magnesiotaaffeite-2N’2S2'
Formula: Mg3BeAl8O16
Reference: Malcherek, T. & Schlüter, J. (2016): Crystal structure of Cr-bearing Mg3BeAl8O16, a new polytype of magnesiotaaffeite-2N′2S. Acta Crystallographica, E72, 1060-1063.
'Moonstone'
Pyrite
Formula: FeS2
Quartz
Formula: SiO2
Schorl
Formula: Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Spinel
Formula: MgAl2O4
Localities: Reported from at least 6 localities in this region.
Topaz
Formula: Al2(SiO4)(F,OH)2
'Tourmaline'
Formula: A(D3)G6(T6O18)(BO3)3X3Z
Uraninite
Formula: UO2
Reference: Ted Themelis (2008) Gems and Mines of Mogok
Uraninite var: Pitchblende
Formula: UO2
Reference: Ted Themelis (2008) Gems and Mines of Mogok

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Pyrite2.EB.05aFeS2
Group 4 - Oxides and Hydroxides
Corundum4.CB.05Al2O3
var: Ruby4.CB.05Al2O3
var: Sapphire4.CB.05Al2O3
var: Star Ruby4.CB.05Al2O3
var: Star Sapphire4.CB.05Al2O3
Magnesiotaaffeite-2N’2S4.FC.25Mg3Al8BeO16
Quartz4.DA.05SiO2
Spinel4.BB.05MgAl2O4
Uraninite4.DL.05UO2
var: Pitchblende4.DL.05UO2
Group 9 - Silicates
'Almandine'9.AD.25Fe2+3Al2(SiO4)3
Beryl9.CJ.05Be3Al2(Si6O18)
var: Aquamarine9.CJ.05Be3Al2Si6O18
var: Goshenite9.CJ.05Be3Al2(Si6O18)
Cordierite9.CJ.10(Mg,Fe)2Al3(AlSi5O18)
var: Iolite9.CJ.10(Mg,Fe)2Al3(AlSi5O18)
Kornerupine9.BJ.50Mg3Al6(Si,Al,B)5O21(OH)
Schorl9.CK.05Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Topaz9.AF.35Al2(SiO4)(F,OH)2
Unclassified Minerals, Rocks, etc.
Kyawthuite (TL)-Bi3+Sb5+O4
Lapis lazuli-
Magnesiotaaffeite-2N’2S2-Mg3BeAl8O16
Moonstone-
Tourmaline-A(D3)G6(T6O18)(BO3)3X3Z

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 4 - SIMPLE OXIDES
A2X3
Corundum4.3.1.1Al2O3
Group 5 - OXIDES CONTAINING URANIUM OR THORIUM
AXO2·xH2O
Uraninite5.1.1.1UO2
Group 7 - MULTIPLE OXIDES
AB2X4
Magnesiotaaffeite-2N’2S7.2.11.1Mg3Al8BeO16
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
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
Topaz52.3.1.1Al2(SiO4)(F,OH)2
Group 58 - SOROSILICATES Insular, Mixed, Single, and Larger Tetrahedral Groups
Insular, Mixed, Single, and Larger Tetrahedral Groups with cations in [4] and higher coordination; single and double groups (n=1, 2)
Kornerupine58.1.1.1Mg3Al6(Si,Al,B)5O21(OH)
Group 61 - CYCLOSILICATES Six-Membered Rings
Six-Membered Rings with [Si6O18] rings; possible (OH) and Al substitution
Beryl61.1.1.1Be3Al2(Si6O18)
Six-Membered Rings with Al substituted rings
Cordierite61.2.1.1(Mg,Fe)2Al3(AlSi5O18)
Six-Membered Rings with borate groups
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, Rocks, etc.
Beryl
var: Aquamarine
-Be3Al2Si6O18
var: Goshenite-Be3Al2(Si6O18)
Cordierite
var: Iolite
-(Mg,Fe)2Al3(AlSi5O18)
Corundum
var: Ruby
-Al2O3
var: Sapphire-Al2O3
var: Star Ruby-Al2O3
var: Star Sapphire-Al2O3
Kyawthuite (TL)-Bi3+Sb5+O4
'Lapis lazuli'-
'Magnesiotaaffeite-2N’2S2'-Mg3BeAl8O16
'Moonstone'-
'Tourmaline'-A(D3)G6(T6O18)(BO3)3X3Z
Uraninite
var: Pitchblende
-UO2

List of minerals for each chemical element

HHydrogen
H KornerupineMg3Al6(Si,Al,B)5O21(OH)
H SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
H TopazAl2(SiO4)(F,OH)2
BeBeryllium
Be Beryl (var: Aquamarine)Be3Al2Si6O18
Be BerylBe3Al2(Si6O18)
Be Beryl (var: Goshenite)Be3Al2(Si6O18)
Be Magnesiotaaffeite-2N’2SMg3Al8BeO16
Be Magnesiotaaffeite-2N’2S2Mg3BeAl8O16
BBoron
B KornerupineMg3Al6(Si,Al,B)5O21(OH)
B SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
B TourmalineA(D3)G6(T6O18)(BO3)3X3Z
OOxygen
O AlmandineFe32+Al2(SiO4)3
O Beryl (var: Aquamarine)Be3Al2Si6O18
O BerylBe3Al2(Si6O18)
O Cordierite(Mg,Fe)2Al3(AlSi5O18)
O CorundumAl2O3
O Beryl (var: Goshenite)Be3Al2(Si6O18)
O Cordierite (var: Iolite)(Mg,Fe)2Al3(AlSi5O18)
O KornerupineMg3Al6(Si,Al,B)5O21(OH)
O KyawthuiteBi3+Sb5+O4
O Magnesiotaaffeite-2N’2SMg3Al8BeO16
O Magnesiotaaffeite-2N’2S2Mg3BeAl8O16
O Uraninite (var: Pitchblende)UO2
O QuartzSiO2
O Corundum (var: Ruby)Al2O3
O Corundum (var: Sapphire)Al2O3
O SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
O SpinelMgAl2O4
O Corundum (var: Star Ruby)Al2O3
O Corundum (var: Star Sapphire)Al2O3
O TopazAl2(SiO4)(F,OH)2
O TourmalineA(D3)G6(T6O18)(BO3)3X3Z
O UraniniteUO2
FFluorine
F TopazAl2(SiO4)(F,OH)2
NaSodium
Na SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
MgMagnesium
Mg Cordierite(Mg,Fe)2Al3(AlSi5O18)
Mg Cordierite (var: Iolite)(Mg,Fe)2Al3(AlSi5O18)
Mg KornerupineMg3Al6(Si,Al,B)5O21(OH)
Mg Magnesiotaaffeite-2N’2SMg3Al8BeO16
Mg Magnesiotaaffeite-2N’2S2Mg3BeAl8O16
Mg SpinelMgAl2O4
AlAluminium
Al AlmandineFe32+Al2(SiO4)3
Al Beryl (var: Aquamarine)Be3Al2Si6O18
Al BerylBe3Al2(Si6O18)
Al Cordierite(Mg,Fe)2Al3(AlSi5O18)
Al CorundumAl2O3
Al Beryl (var: Goshenite)Be3Al2(Si6O18)
Al Cordierite (var: Iolite)(Mg,Fe)2Al3(AlSi5O18)
Al KornerupineMg3Al6(Si,Al,B)5O21(OH)
Al Magnesiotaaffeite-2N’2SMg3Al8BeO16
Al Magnesiotaaffeite-2N’2S2Mg3BeAl8O16
Al Corundum (var: Ruby)Al2O3
Al Corundum (var: Sapphire)Al2O3
Al SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Al SpinelMgAl2O4
Al Corundum (var: Star Ruby)Al2O3
Al Corundum (var: Star Sapphire)Al2O3
Al TopazAl2(SiO4)(F,OH)2
SiSilicon
Si AlmandineFe32+Al2(SiO4)3
Si Beryl (var: Aquamarine)Be3Al2Si6O18
Si BerylBe3Al2(Si6O18)
Si Cordierite(Mg,Fe)2Al3(AlSi5O18)
Si Beryl (var: Goshenite)Be3Al2(Si6O18)
Si Cordierite (var: Iolite)(Mg,Fe)2Al3(AlSi5O18)
Si KornerupineMg3Al6(Si,Al,B)5O21(OH)
Si QuartzSiO2
Si SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Si TopazAl2(SiO4)(F,OH)2
SSulfur
S PyriteFeS2
FeIron
Fe AlmandineFe32+Al2(SiO4)3
Fe Cordierite(Mg,Fe)2Al3(AlSi5O18)
Fe Cordierite (var: Iolite)(Mg,Fe)2Al3(AlSi5O18)
Fe PyriteFeS2
Fe SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
SbAntimony
Sb KyawthuiteBi3+Sb5+O4
BiBismuth
Bi KyawthuiteBi3+Sb5+O4
UUranium
U Uraninite (var: Pitchblende)UO2
U UraniniteUO2

References

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Ted Themelis (2008) Gems and Mines of Mogok

Localities in this Region
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