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Kato

A nice Fall day in the Sacramento Mountains

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Kato
4 hours ago, Fossildude19 said:

I'd say you're looking at some ichnofossils there, rather than crinoids.

 

F3.large.jpg.   F8.large.jpg

@Fossildude19      

 

Thank you!

 

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Tidgy's Dad

Nice ichnofossils. :)

Interesting report and photos, I love the bornite. 

 

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FranzBernhard
12 hours ago, Kato said:

In one location samples present as Bornite.

I am more inclined that these are manganese oxide or hematite coatings with iridescent surface.

Some tests would be required: 

- What happens if you put a fragment in a flame? Did you get a pungent/stinging smell of SO2?

- How does a fresh break look like? Bornite would be metallic pinkish, turning to red and blue within hours.

@ynot

Franz Bernhard

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ynot
1 hour ago, FranzBernhard said:

I am more inclined that these are ..... hematite coatings with iridescent surface.

Bornite does not form botryoidal structures so the piece in question is not that mineral.

It does look like iridescent hematite to Me also.

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Kato
7 hours ago, FranzBernhard said:

I am more inclined that these are manganese oxide or hematite coatings with iridescent surface.

Some tests would be required: 

- What happens if you put a fragment in a flame? Did you get a pungent/stinging smell of SO2?

- How does a fresh break look like? Bornite would be metallic pinkish, turning to red and blue within hours.

@ynot

Franz Bernhard

@FranzBernhard @ynot

 

Thank you. Hematite seems the most likely candidate given the geology of that immediate area. I had just taken some 40x magnification shots and it definitely is botryoidal.

 

Given that recommendation I did some research and found the possibility of Turgite a mixture of hematite and goethite. Apparently there is an entire hillside exposed somewhere in New Mexico.

 

 

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