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Tawmaw (Tawhmaw; Taw Maw), Myitkyina-Mogaung District, Kachin State, Burma (Myanmar)

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Jade locality 120 kilometers northwest of Mogaung.
Transformation zone environment of an ophiolitic complex.
Amphibolites and chloritites at the contact between albitite (plagiogranite) vein (with chromite xenocrystals) and a serpentinite host-rock.
The albitite transformed to jadeitite.
Amphibolites formed by metasomatic reaction during HP/LT metamorphism (hydrous low-T eclogite facies or blue schist facies) (subduction).
Host rocks are magnetite chloritoschists, glaucophane schists and actinolitic schists.

Article on Mawsitsit, a gem material from this locality





Mineral List:
  		•  Albite
    Na[AlSi
     
    3
    		O
     
    8
    		]
    Reference: [C. Mével and J.R. Kiénast, Bull. Minéral. , 109, 6, 1986, pp. 617-633.]
  		•  'Chlorite Group'
    Reference: []
  		•  Chromite
    FeCr
     
    2
    		O
     
    4
    Reference: []
  		•  Diopside
    CaMg[Si
     
    2
    		O
     
    6
    		]
    Reference: [C. Mével and J.R. Kiénast, Bull. Minéral. , 109, 6, 1986, pp. 617-633.]
  		•  Eckermannite
    [Na][Na
     
    2
    		][(Mg,Fe
    2+
     
    		)
     
    4
    		Al][(OH)
     
    2
    		|Si
     
    8
    		O
     
    22
    		]
    Description: Rich in chromium (up to 11 %).
    Reference: []
  		•  Epidote
    {Ca
     
    2
    		}{Al
     
    2
    		Fe
    3+
     
    		}[O|OH|SiO
     
    4
    		|Si
     
    2
    		O
     
    7
    		]
    Reference: []
  		•  Epidote
    var: Tawmawite
    Ca
     
    2
    		(Al,Fe
    3+
     
    		,Cr)
     
    3
    		[O|OH|SiO
     
    4
    		|Si
     
    2
    		O
     
    7
    		]
    Reference: []
  		•  Glaucophane
    [ ][Na
     
    2
    		][Mg
     
    3
    		Al
     
    2
    		][(OH)
     
    2
    		|Si
     
    8
    		O
     
    22
    		]
    Description: Rich in chromium (up to 11 %).
    Reference: [C. Mével and J.R. Kiénast, Bull. Minéral. , 109, 6, 1986, pp. 617-633.]
  		•  Jadeite
    Na(Al,Fe
    3+
     
    		)[Si
     
    2
    		O
     
    6
    		]
    Reference: []
  		•  Jadeite
    var: Chromojadeite
    Na(Al,Cr)Si
     
    2
    		O
     
    6
    Description: Rims kosmochlor (around chromite) in katophorite.
    Reference: [C. Mével and J.R. Kiénast, Bull. Minéral. , 109, 6, 1986, pp. 617-633.]
    Site Photo
    Tawmaw (Tawhmaw; Taw Maw), Myitkyina-Mogaung District, Kachin State, Burma (Myanmar)
    © Pavel M. Kartashov
  		•  Katophorite
    Na[CaNa][Fe
    2+
    4
    		(Al,Fe
    3+
     
    		)][(OH)
     
    2
    		|AlSi
     
    7
    		O
     
    22
    		]
    Description: Rich in chromium (up to 11 %).
    Reference: [C. Mével and J.R. Kiénast, Bull. Minéral. , 109, 6, 1986, pp. 617-633.]
  		•  Kosmochlor
    NaCr[Si
     
    2
    		O
     
    6
    		]
    Description: Rims chromite.
    Reference: [American Mineralogist, Volume 69, pages 1180-1i,83' 1984]
    Site Photo
    Tawmaw (Tawhmaw; Taw Maw), Myitkyina-Mogaung District, Kachin State, Burma (Myanmar)
    © Knut Eldjarn
  		•  Nepheline
    (Na,K)[AlSiO
     
    4
    		]
    Description: Associated with albite, replaces jadeite.
    Reference: [C. Mével and J.R. Kiénast, Bull. Minéral. , 109, 6, 1986, pp. 617-633.]
  		•  Nybøite
    [Na][Na
     
    2
    		][Mg
     
    3
    		Al
     
    2
    		][(OH)
     
    2
    		|AlSi
     
    7
    		O
     
    22
    		]
    Reference: []
  		•  Richterite
    Na[CaNa][Mg
     
    5
    		][(OH)
     
    2
    		|Si
     
    8
    		O
     
    22
    		]
    Reference: [C. Mével and J.R. Kiénast, Bull. Minéral. , 109, 6, 1986, pp. 617-633.]
  		•  'Serpentine Group'
    D
     
    2
    		[Si
     
    2
    		O
     
    5
    		](OH)4 + or - nH
     
    2
    		O
    Description: In amphibolite, with amphibole and chromite.
    Reference: [C. Mével and J.R. Kiénast, Bull. Minéral. , 109, 6, 1986, pp. 617-633.]


    16 entries listed. 12 valid minerals.

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