weathered eucrite?

[rockpassion]

I got my hands on this very interesting rock. It is weathered but smooth to the touch and has alot of dimples. Could this be a eucrite?

 

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[ToddsPoint]

It looks like a typical ultra mafic rock. Like diabase maybe. The white could be plagioclae feldspar and the dark green pyroxene. Fine grained igneous rocks like that were used by Indians to make celts and axes. It’s tough and can take a beating. What is the source of this rock?

 

[rockpassion]

It looks like a typical ultra mafic rock. Like diabase maybe. The white could be plagioclae feldspar and the dark green pyroxene. Fine grained igneous rocks like that were used by Indians to make celts and axes. It’s tough and can take a beating. What is the source of this rock?

bought it from a private collection and have asked him where the stone is from. but i have yet to get the answer. P.S. how can you tell the difference between a weathered eucrite and a weathered possible diabase??

 

[rockpassion]

UPDATE: The rock has been found in a pile of rocks on a farmers field in Friesland (Netherlands). What is realy unusual is that the rock has several windows ground into the stone and the finder of the rock didn't do that. So an old rock from a field probably glacial with ground windows into the rock? And those are real grind windows and not scars from a glacier.

 

[Red-Coat]

Sorry, but I don’t see any reason to suspect that this is a meteorite. The ‘dimples’ are not typical of regmaglypts and I see no evidence of a fusion crust… weathered or not. The routes you’re using to try and find a meteorite (and you seem desperate to do so) are unlikely to be productive I’m afraid and, in any case, for most meteorites simply looking at pictures is not a fruitful method of determination… unless there are distinctive aerodynamic features from atmospheric flight or corroborative evidence from a witnessed fall.

Eucrites are essentially plagioclase-pigeonite basalts with minor accessory minerals and have a composition similar to basaltic earth rocks which are the most common magmatic materials found on Earth. You would need detailed analysis to distinguish them from meteoritic material.

For stony meteorites, the most useful of the ‘simple’ analytical pointers is chromium content, which is usually significantly higher in stony meteorites than in Earth rocks. For those in the HED class (Howardites, Eucrites, Diogenites) the chromium content is generally in the region of 1,000 – 10,000 ppm. Even then, it’s not conclusive since occasional terrestrial rocks can overlap with or exceed those values.

Conclusive determination requires additional testing for other analytical parameters, including things like Fe/Mn ratios and specialist testing for oxygen isotope ratios in relation to the Terrestrial Fractionation Line.

I don't see any 'grind windows' in your pictures. Could you please show us what you mean by this?

 

[rockpassion]

Sorry, but I don’t see any reason to suspect that this is a meteorite. The ‘dimples’ are not typical of regmaglypts and I see no evidence of a fusion crust… weathered or not. The routes you’re using to try and find a meteorite (and you seem desperate to do so) are unlikely to be productive I’m afraid and, in any case, for most meteorites simply looking at pictures is not a fruitful method of determination… unless there are distinctive aerodynamic features from atmospheric flight or corroborative evidence from a witnessed fall.

Eucrites are essentially plagioclase-pigeonite basalts with minor accessory minerals and have a composition similar to basaltic earth rocks which are the most common magmatic materials found on Earth. You would need detailed analysis to distinguish them from meteoritic material.

For stony meteorites, the most useful of the ‘simple’ analytical pointers is chromium content, which is usually significantly higher in stony meteorites than in Earth rocks. For those in the HED class (Howardites, Eucrites, Diogenites) the chromium content is generally in the region of 1,000 – 10,000 ppm. Even then, it’s not conclusive since occasional terrestrial rocks can overlap with or exceed those values.

Conclusive determination requires additional testing for other analytical parameters, including things like Fe/Mn ratios and specialist testing for oxygen isotope ratios in relation to the Terrestrial Fractionation Line.

I don't see any 'grind windows' in your pictures. Could you please show us what you mean by this?

You are wright that i am pretty desperate to find a meteorite beause it is the coolest thing on earth to do so. And it al started with a documentary of a meteorite hunter finding a lunar meteorite. That was when i was 10 or 11 years old and i wanted to find one myself. And since i have not got a dessert to find meteorites and the chance of finding a fresh meteorite even after a witnessed fall is pretty much zero. I concentrate on ancient or old falls that have weathered and specificly achondrites because the contain less iron as chondrites that weather away pretty quick in a moist envoirement. I search everywhere where there are rocks and spotting the odd one out.

This stone i found is the best example that i have found in 40 years of searching, because it is a stone that probably dates back to the ice age because most rocks from Friesland are glacial deposits and in between those rock could lie a weathered meteorite altough the chance is small. What is interesting about this rock are de dimples which shouldn't be there because most glacial rocks are rounded by the ice.

This rock is the closest i can get to a eucrite and olny the top 5 scientists can distinguis the difference between a earth diabase or dolerite and a eucrite. Adn you are wright that will take alott of testing maybe an XRF would help a bit. Anyway i am very happy with tis rock even if it is a pseudo meteorite. And the grinded spots on the stone can not be photographed to show them can not capture the right. But they are clearly hand ground flat small and larger spots on the rock. So not done with a grinder. It is a mystery why, because the rock came out of the ground like that.

 

[Red-Coat]

Yes. I know the problem. Neither of us are in very promising locations for finding meteorites.

Maybe you already know this but, for the Netherlands, there have only been 6 confirmed meteorite finds (one of which was a diogenite) plus 2 ‘doubtfuls’ (from Dordrecht) and 1 pseudometeorite (Loerbeek). The confirmed ones have been found as single stones, not showers, with two exceptions (as far as I know):

The Utrecht fall of 1843 yielded a 7kg L6 Chondrite 5km east of the city and a second 2.7kg stone three days later about 3km away at Loevenhoutje. No others were found, although the possibility remains.

The Glanerbrug fall of 1990 yielded around 500g of LL Chondrite as numerous fragments after a meteorite hit the roof of a house near Enschede. But they all represented broken pieces from a single stone and, despite intensive searches, no additional stones were found outside the immediate impact area.

 

[rockpassion]

Yes. I know the problem. Neither of us are in very promising locations for finding meteorites.

Maybe you already know this but, for the Netherlands, there have only been 6 confirmed meteorite finds (one of which was a diogenite) plus 2 ‘doubtfuls’ (from Dordrecht) and 1 pseudometeorite (Loerbeek). The confirmed ones have been found as single stones, not showers, with two exceptions (as far as I know):

The Utrecht fall of 1843 yielded a 7kg L6 Chondrite 5km east of the city and a second 2.7kg stone three days later about 3km away at Loevenhoutje. No others were found, although the possibility remains.

The Glanerbrug fall of 1990 yielded around 500g of LL Chondrite as numerous fragments after a meteorite hit the roof of a house near Enschede. But they all represented broken pieces from a single stone and, despite intensive searches, no additional stones were found outside the immediate impact area.

Decided to clean the stone with some soapy water and a dark vein apeared on the rock what do you think shockvein?

 

[Red-Coat]

Decided to clean the stone with some soapy water and a dark vein apeared on the rock what do you think shockvein?

No. Looks more like a heat/shrinkage feature.