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PhotosClarification about combeite

5th Apr 2022 00:07 UTCTony Peterson Expert OP

00925610017367632652780.jpg
Combeite, Wollastonite
Ol Doinyo Lengai, Ngorongoro District, Arusha region, Tanzania
Copyright © Andrew Hodgson
There is indeed combeite in this excellent photo, but the central portion with good cleavage is wollastonite. Combeite comprises the reaction rim of rounded crystals surrounding the wollastonite, as in this photomicrograph:



5th Apr 2022 03:01 UTCFrank K. Mazdab 🌟 Expert

you're correct Tony... I'll send Andrew a note...

I actually have a thin section of this material currently in-process, and I can't wait to get it back to see the wonders it holds.

5th Apr 2022 07:43 UTCUwe Kolitsch Manager

Message sent.

5th Apr 2022 14:55 UTCTony Nikischer 🌟 Manager

Correct! See image for Specimen ID: 76M-434 

The reaction rim is the combeite, the core is wollastonite. 

5th Apr 2022 20:02 UTCAndrew Hodgson

That's very helpful - thanks everyone.

5th Apr 2022 20:59 UTCFrank K. Mazdab 🌟 Expert

fixed mineral list and caption, and re-approved for site-wide viewing.
 
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