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Maw Sit Sit

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About Maw Sit SitHide

'Maw Sit Sit' is a polymineralic material (a "rock") from Burma (Myanmar) which has achieved some prominence as both a gemstone and a carving material. While some have classed this as a "jadeite" (and it has been called 'Chrome Jade'), in reality the colour is due to another clinopyroxene, kosmochlor (NaCrSi2O6) and it should not, therefore, be considered a variety of jadeite. It was first noted in the early 1960s by the famed Swiss gemologist Eduard J. Gübelin during field investigations in Burma.

Composition of Maw Sit Sit is variable, but the main components are, in decreasing order of abundance, albite, chromian eckermannite, kosmochlor, chromite and natrolite (Gübelin, 1965; Colombo et al., 2000; see also Shi et al., 2012).

The components:

Kosmochlor – the main colouring mineral species in Maw Sit Sit is kosmochlor, a sodium chromium pyroxene previously called “ureyite”. (Ureyite was discredited as a mineral species when it was determined to be identical to kosmochlor.) Kosmochlor is the primary component of both the brilliant emerald-green and dark green-black patches.

Chromian Jadeite – a chromium-enriched, but still Al-dominant jadeite (Al>Cr).

● Cr-bearing Eckermannite – a chromium-enriched sodium-magnesium-iron amphibole-group mineral.

● Cr-bearing Albite – a chromium-enriched albite.

Visit gemdat.org for gemological information about Maw Sit Sit.


Pronounciation of Maw Sit SitHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Common AssociatesHide

Associated Minerals Based on Photo Data:
Kosmochlor1 photo of Maw Sit Sit associated with Kosmochlor on mindat.org.
Albite1 photo of Maw Sit Sit associated with Albite on mindat.org.
Chromojadeite1 photo of Maw Sit Sit associated with Chromojadeite on mindat.org.

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Maw Sit SitHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Gübelin, E. (1964): Maw-sit-sit: A new decorative gemstone from Burma. Gems & Gemology, 11 (8), 227-238.
Gübelin, E. (1965): Maw-sit-sit proves to be jade-albite. J. Gemmology 9 (11), 372-379.
Hänni, H.A. & Meyer, J. (1997): Maw-sit-sit (kosmochlore jade): A metamorphic rock with a complex composition from Myanmar (Burma). Proceedings of the 26th International Gemmological Conference, Idar-Oberstein, Germany, pp. 22-24.
Colombo, F., Rinaudo, C. and Trossarelli, C. (2000): The mineralogical composition of maw-sit-sit from Myanmar. Journal of Gemmology 27 (2), 87-92.
Qi, L., Lu, X., Liu, W. and Ouyang, Q. (2003): Maw-sit-sit jade from Burma: A particular jade formed by dynamic metamorphism and metasomatism. Journal of Gems and Gemmology 5 (4), 1-7.
Shi, G., Harlow, G. E., Wang, J., Wang, J., Ng, E., Wang, X., Cao, S. & Cui, W. (2012). Mineralogy of jadeitite and related rocks from Myanmar: a review with new data. European Journal of Mineralogy, 24, 345-370.
Franz, L., Sun, T.T., Hänni, H.A., de Capitani, C., Thanasuthipitak, T., Atichat, W. (2014): A comparative study of jadeite, omphacite and kosmochlor jades from Myanmar, and suggestions for a practical nomenclature. Journal of Gemmology, 34 (3), 210-229.

Internet Links for Maw Sit SitHide

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