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http://www.mindat.org/min-3805.html
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Strontium Carbonate rare sulphide vein associated
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Strontium in hydrothermal biology associated spheroidalism.
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http://www.nrcresearchpress.com/doi/abs/10.1139/e03-060?journalCode=cjes
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The strontium strengthens the shells of the spheroids somehow, and the cores are less ordered, amorphous, and the shells and even the masses become somewhat angular, facets, when forming a residual semi-fluid after the spheroids are forming.
The association of the minerals has a progression towards a fixation of the strontium in the nanometer sized shells in very small crystalline 'cages'. Much of the Earth research gives a matching pattern for looking to strontium levels in the spheroids parts.
Certainly the geologists have suggested this now. I haven't been reading the other topics these past two weeks.
There is a suggestion that bio and geo actions could be incorporated in the mineral processes. Will more photos or tests confirm the similarities or point to a bio causation aspect?
Misplaced a few research links, but I'll find them for you.
Cute new spheroidalism type.
Strontium levels are elevated all over the Northern Lowlands of Mars. These may be common at many locations? Just a few suggestions and questions.
Do these look like a possible match to Opportunities new find?
Zeolites, water influence, many related aspects seem to be suggested.