GREY:MGXMF - Post by User
Post by
Wangotango67on Feb 23, 2023 1:07am
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Post# 35299968
EGGS + OPALS -
EGGS + OPALS - I will add,
When i was researching the Mt Nelson Super Group minerology,
There are some mineral anomalies that were not understood, such as the - yellow, egg looking
pods and opals.
I have come across other literature that discusses these yellow egg shaped pods found in dolomites which explain away these anomlaies as, coral reef ( various ) mineral pods. Same traits, yellow, light brown colorations.
As for the opals.... i couldn't help but think of,
Mt Nelson research papers that do mention - opals.
Which in my former post on page 15 of pdf - it mentions...
While the mineralogical identity of zaratite is not resolved, it is probable that it is initially an amorphous basic nickel carbonate that is undergoing crystallization with loss of water, forming a number of nickel carbonate hydrates. An analogy to opal may be drawn.
Do take note of the mention of nickel and magnesium in - pdf below.
Quite interesting.
A one can read....
There is a distinct mystery that revolves around - calcium, magnesium and - nickel.
The synthesis of hte nickel, is in my opinion, not really understood.
Yet... can be duplicated in the lab to form a specific carbonate.
And.... tempreture sensitive when decomposition is realavent.
HENCE - imagine a fire assay @ 1000 degrees over 1 hour long ?
Which points to the importance of, special assaying is needed to distinguish a sensitive nickel species that is prone to decomposition and also... with traits of similar crystal structures.
Here's the link to PDF - again....
https://rruff.info/doclib/MinMag/Volume_33/33-263-663.pdf
Cheers.....