Maw Sit Sit
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About Maw Sit Sit
'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.
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.Unique Identifiers
Mindat ID:
42915
Long-form identifier:
mindat:1:1:42915:9
Pronunciation of Maw Sit Sit
Pronunciation:
| Play | Recorded by | Country |
|---|---|---|
| Jolyon Ralph | United Kingdom |
Common Associates
Associated Minerals Based on Photo Data:
| 4 photos of Maw Sit Sit associated with Kosmochlor | NaCrSi2O6 |
| 4 photos of Maw Sit Sit associated with Chromojadeite | Na(Al,Cr)Si2O6 |
| 1 photo of Maw Sit Sit associated with Manganese Dendrites | |
| 1 photo of Maw Sit Sit associated with Albite | Na(AlSi3O8) |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Maw Sit Sit
mindat.org URL:
https://www.mindat.org/min-42915.html
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References for Maw Sit Sit
Localities for Maw Sit Sit
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The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Myanmar | |
| GIA 2018 |
Myanmar