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Meteorites

 

Almost pure iron and nickel:

Iron_Meteorite-10Pub2.png

Iron_Meteorite-10Pub2.png

 

On 10/6/19 6:49 PM, GEOelectronics@... wrote:
Almost pure iron and nickel:
The photo nicely shows grain, did you etch the surface after polishing??
I have been thinking about doing that with some specimens I have.

AnotherWally


--

AnotherWally
anotherwally@...
 

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Hi AWally, etching not needed for XRF but is needed to classify the meteorite.

The Widmanst?tten pattern is fascinating, no?

Geo



?

On 2019/10/06 11:08 PM, AnotherWally wrote:



On 10/6/19 6:49 PM, GEOelectronics@... wrote:
Almost pure iron and nickel:

The photo nicely shows grain, did you etch the surface after polishing??
I have been thinking about doing that with some specimens I have.

AnotherWally


--?

AnotherWally
anotherwally@...
 

Hi Geo,

Do you know what temperature the cooled SDD is set to operate at?

Randall
 

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Yes it is monitored and controlled precisely, the one being used today is programed to 219K (~ -65F)

Geo

?

On 2019/10/07 12:50 PM, Randall Buck wrote:



Hi Geo,

Do you know what temperature the cooled SDD is set to operate at?

Randall
 

Suppose this is why nature's stainless steel really does rust?

Dave - W?LEV


On Mon, Oct 7, 2019 at 1:49 AM <GEOelectronics@...> wrote:
Almost pure iron and nickel:

Iron_Meteorite-10Pub2.png



--
Dave - W?LEV
Just Let Darwin Work
Just Think
 
Edited

Meteroite sample- the one that got away

Had a nice one picked out, but only made ot as far as the freight elevator......

Meteorite.png
Spreadum2.png

 

I had the opposite experience many years ago

I took my meteorite , which I had since childhood,
to a geology professor for confirmation as to type.

When I returned, he said,he "couldn't find it"

Randall

----- Original Message -----
From: GEOelectronics@...
To: [email protected]
Sent: Mon, 07 Oct 2019 17:08:50 -0700 (PDT)
Subject: Re: [XRF] Meteorites

Meteroite sample- the one that got away

Had a nice one picked out, but only made ot as far as the freight elevator......
 

We have a rock shop in Fort Collins, Co. which has a NiFe meteorite on display open to touch, feel, drool over, ask 'how much' and what ever else strikes your fancy.? No problem with steeling it.? So heavy you or five additional strong college students males could not pick it up.

Dave - W?LEV


On Tue, Oct 8, 2019 at 12:08 AM <GEOelectronics@...> wrote:
Meteroite sample- the one that got away

Had a nice one picked out, but only made ot as far as the freight elevator......



--
Dave - W?LEV
Just Let Darwin Work
Just Think
 

I, too, have a NiFe small meteorite I found on our property in the Front Range of the Rockies.? Also, a slabbed and polished large chunk of caprolite, dinosaur poop, with a chunk of basalt from the Jurassic it pooped on sticking out of it.? Also quite interesting under the microscope for all the partially digested plant matter in the specimen.? Also several bone pieces found on the property which is at the pinnacle of all species extinctions:? "The Great Dying".? This is pegged at the upper Permian /? lower Triassic boundary.? Also a few flora fossils in the conglomerates from the dam burst holding back the western Rocky Mts. ocean at the same time.? I've always contemplated taking all to CSU in Fort Collins for an "analysis" and critical identification.?? But,...........same as you........I'm afraid I'd never get them back.

Dave - W?LEV


On Tue, Oct 8, 2019 at 12:33 AM Randall Buck <rbuck@...> wrote:

I had the opposite experience many years ago

I took my meteorite , which I had since childhood,?
to a geology professor for confirmation as to type.

When I returned, he said,he "couldn't find it"

Randall




----- Original Message -----
From: GEOelectronics@...
To: [email protected]
Sent: Mon, 07 Oct 2019 17:08:50 -0700 (PDT)
Subject: Re: [XRF] Meteorites

Meteroite sample- the one that got away

Had a nice one picked out, but only made ot as far as the freight elevator......









--
Dave - W?LEV
Just Let Darwin Work
Just Think
 

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Bummer? Randall....

Geo

?

On 2019/10/07 07:33 PM, Randall Buck wrote:


I had the opposite experience many years ago

I took my meteorite , which I had since childhood, ?
to a geology professor for confirmation as to type.

When I returned, he said,he "couldn't find it"

Randall




----- Original Message -----
From: GEOelectronics@...
To: [email protected]
Sent: Mon, 07 Oct 2019 17:08:50 -0700 (PDT)
Subject: Re: [XRF] Meteorites

Meteroite sample- the one that got away

Had a nice one picked out, but only made ot as far as the freight elevator......
 
Edited

This picture is of a different Si-PIN + electronics stack being tested on the same jig. This one is set to 214K temp. The scan after only 60 seconds. Same Fe-Ni meteorite.

Since the earlier tests the filtering/shielding on the back of the @59.5 has been fiddled with quite a bit. Once the configuration is as best as I can make it, I'll work on making it thinner, to reduce the air space between the front of the adaptor and the actual sensor. Every fraction of an inch increases count time and degrades the lowest energy actually resolved. Right now the rear filter is? a mixture of iron, lead and copper, each addressing one of the interfering signals from the exciter daughters.
In the photo, the part with the flat ribbon cable is the sensor and its preamp.
That small assembly is temporarily rubber-banded to an aluminum slab for heat sinking. The chunk of lead behind it is acting as an electronic shield to keep the electronics stack from inducing RFI back into the sensor. When installed into their respective boxes, the whole assembly will be pocket sized and require a single 5V Power supply.
Geo

Fe-Ni-Meteorite-60s.composite.jpg

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