Question about lunar meteorites

[rockpassion]

Can someone tell me if lunar meteorites react to acid? Like if you put a lunar meteorite in vinigar. because that is what i saw on youtube that a meteorite dealer cleaned his lunar with vinigar but deluted of coarse.

 

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[Red-Coat]

Yes. Lunar meteorites are generally basaltic or feldspar-rich and potentially contain a variety of minerals which will react with acids... but slowly/weakly. Also, a number of lunar meteorites exhibit subsequent deposition of calcite in cracks and fissures arising from terrestrial weathering/alteration and that will react more strongly.

If what lies behind your question is whether or not it's a helpful diagnostic test, the answer is "no". Many terrestrial rocks have similar compositions and would exhibit the same reaction.

 

[rockpassion]

Yes. Lunar meteorites are generally basaltic or feldspar-rich and potentially contain a variety of minerals which will react with acids... but slowly/weakly. Also, a number of lunar meteorites exhibit subsequent deposition of calcite in cracks and fissures arising from terrestrial weathering/alteration and that will react more strongly.

If what lies behind your question is whether or not it's a helpful diagnostic test, the answer is "no". Many terrestrial rocks have similar compositions and would exhibit the same reaction.

Thanks very clear answer. Found an interresting rock that has allot of glassy shockveins. And it reacts slowly to acid. And it has no trace fossils or fossils at all in it. The matrix looks like a troctolite lunar.

 

[GoldReport]

Disclaimer: I'm not a meteorite expert.

Why do you think this is a meteorite? In your picture, the rock looks like a generic silicate. The lack of fossils doesn't prove anything.

Actual meteorites are very very rare which is the main reason I question your claim in the first place, no offense. Best to take it to a university where a geologist could confirm one way or another.

 

[rockpassion]

Disclaimer: I'm not a meteorite expert.

Why do you think this is a meteorite? In your picture, the rock looks like a generic silicate. The lack of fossils doesn't prove anything.

Actual meteorites are very very rare which is the main reason I question your claim in the first place, no offense. Best to take it to a university where a geologist could confirm one way or another.

is oke. i will do that.

 

[Red-Coat]

Troctolite is more common on Earth than on the Moon. There are only 14 known lunar meteorites with a troctolitic anorthosite composition. Plus a small non-meteoritic sample of troctolite brought back from the Moon by the Apollo 17 mission.

There’s no indication of scale from your picture, but large crystals like that aren’t seen in meteorites. If it’s crystalline quartz then that only rarely occurs in meteorites in small quantities and not in large enough sizes to be seen with the naked eye. I’m not seeing shock veins, but rather cracking from cooling during crystallisation.

The absence of fossils is meaningless since the rock is clearly igneous rather than sedimentary.

 

[rockpassion]

Troctolite is more common on Earth than on the Moon. There are only 14 known lunar meteorites with a troctolitic anorthosite composition. Plus a small non-meteoritic sample of troctolite brought back from the Moon by the Apollo 17 mission.

There’s no indication of scale from your picture, but large crystals like that aren’t seen in meteorites. If it’s crystalline quartz then that only rarely occurs in meteorites in small quantities and not in large enough sizes to be seen with the naked eye. I’m not seeing shock veins, but rather cracking from cooling during crystallisation.

The absence of fossils is meaningless since the rock is clearly igneous rather than sedimentary.

The first photo is of a broken chip from the main mass and there are clear veins running troughout the rock and the dark lines you see in the first photo are the veins. but those are hard to capture on camera. here is the main mass or the rock.

 

[rockpassion]

When you would cut a slice of my rock it would look alot like nwa 8687

 

[Red-Coat]

When you would cut a slice of my rock it would look alot like nwa 8687

As would many Earth rocks.

 

[rockpassion]

going off topic maybe but i found this on the internet, is it genuine: https://www.panspermia.org/zhmur2.htm

 

[Red-Coat]

going off topic maybe but i found this on the internet, is it genuine: https://www.panspermia.org/zhmur2.htm

Depends on what you mean by 'genuine'.

Brig Klyce is an advocate of the fringe theory of ‘Panspermia’ which proposes that life exists throughout the Universe, distributed by space dust and that organisms such as bacteria, complete with their DNA, could be transported by means such as comets through space to planets including Earth. The theory purports that life did not originate on Earth, but instead evolved elsewhere and seeded life as we know it.

He has an agenda, and note that what you found was published on his own ‘Cosmic Ancestry’ website, not in any reputable mainstream science publications. It would never have passed peer review for such publications. More on 'Cosmic Ancestry' beliefs here:

Cosmic_ancestry

Cosmic ancestry Cosmic ancestry is a hypothesis of the origin of life on Earth, based on the panspermia views of Fred Hoyle and Chandra Wickramasinghe and

www.bionity.com

 

[rockpassion]

Depends on what you mean by 'genuine'.

Brig Klyce is an advocate of the fringe theory of ‘Panspermia’ which proposes that life exists throughout the Universe, distributed by space dust and that organisms such as bacteria, complete with their DNA, could be transported by means such as comets through space to planets including Earth. The theory purports that life did not originate on Earth, but instead evolved elsewhere and seeded life as we know it.

He has an agenda, and note that what you found was published on his own ‘Cosmic Ancestry’ website, not in any reputable mainstream science publications. It would never have passed peer review for such publications. More on 'Cosmic Ancestry' beliefs here:

Cosmic_ancestry

Cosmic ancestry Cosmic ancestry is a hypothesis of the origin of life on Earth, based on the panspermia views of Fred Hoyle and Chandra Wickramasinghe and

www.bionity.com

oke so no fossils or microfossils on the moon then? And you are sure my rock is igneous or could it be limestone?

 

[Red-Coat]

oke so no fossils or microfossils on the moon then? And you are sure my rock is igneous or could it be limestone?

Well, it looks igneous. Definitely not sedimentary, so not limestone.

 

[rockpassion]

Well, it looks igneous. Definitely not sedimentary, so not limestone.

oke very interesting, i have inserted a new photo of the hole rock. can you tell anything from it how it was formed. the main features are the large stable cracks and what looks like vesicles.

 

[Red-Coat]

I’ve long given up on trying to identify most rocks from pictures alone unless they have very obvious distinctive features. All I would say is this.

The appearance is broadly similar to what has become colloquially known as “Manten Stone” and given that name by the Japanese aquarium designer Takashi Amano. Also sometimes called “elephant rock”. Amano popularised its decorative use in aquariums because its holes, nooks and crannies were a haven for small aquatic creatures and algae and it didn’t leach anything noxious into the water.

The term is a non-geological generic for a variety of igneous volcanic rocks (not a single rock type) formed under extreme pressure which have subsequently experienced significant exposure weathering after solidification. The stuff he originally used was from high elevation mountain ranges in Asia, but later users have sourced it principally from Lithuania and the Baltic region. However, it’s just a generic term and various other locations around the world have volcanic rocks of a similar nature in a variety of greyish and fawn hues. Some examples:

 

[rockpassion]

I’ve long given up on trying to identify most rocks from pictures alone unless they have very obvious distinctive features. All I would say is this.

The appearance is broadly similar to what has become colloquially known as “Manten Stone” and given that name by the Japanese aquarium designer Takashi Amano. Also sometimes called “elephant rock”. Amano popularised its decorative use in aquariums because its holes, nooks and crannies were a haven for small aquatic creatures and algae and it didn’t leach anything noxious into the water.

The term is a non-geological generic for a variety of igneous volcanic rocks (not a single rock type) formed under extreme pressure which have subsequently experienced significant exposure weathering after solidification. The stuff he originally used was from high elevation mountain ranges in Asia, but later users have sourced it principally from Lithuania and the Baltic region. However, it’s just a generic term and various other locations around the world have volcanic rocks of a similar nature in a variety of greyish and fawn hues. Some examples:

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after closer examenation with my 10x loupe the rock contains micro fossils after all. so a micro fossil limestone hence the reaction to the acid as i mentioned in the beginning of the thread.

 

[Red-Coat]

after closer examenation with my 10x loupe the rock contains micro fossils after all. so a micro fossil limestone hence the reaction to the acid as i mentioned in the beginning of the thread.

If you say so, but it has no likeness to any limestone I've ever seen.

 

[rockpassion]

If you say so, but it has no likeness to any limestone I've ever seen.

the fossils are 2 mm or less, very strange because if i look at the broken off fragment i also don't see a limestone but rather a metamorphic rock as you mentioned yourself. should i keep it or give it away.? it could be rare. This is what one looks like: https://www.alamy.com/stock-photo-f...00e0a3a140b407caefae2aa59c4dcf95&searchtype=0

 

[Red-Coat]

the fossils are 2 mm or less, very strange because if i look at the broken off fragment i also don't see a limestone but rather a metamorphic rock as you mentioned yourself. should i keep it or give it away.? it could be rare. This is what one looks like: https://www.alamy.com/stock-photo-f...00e0a3a140b407caefae2aa59c4dcf95&searchtype=0

Since I remain sceptical that you have correctly identified it as a micro-fossil-bearing limestone, I have no particular view on whether you should keep it, sell it, or consign it to the flower bed.

 

[rockpassion]

Since I remain sceptical that you have correctly identified it as a micro-fossil-bearing limestone, I have no particular view on whether you should keep it, sell it, or consign it to the flower bed.

well it is way to heavy to be moved so it will stay put in my livingroom, and i would love to be proven wrong if it turns out not being a rock with micro fossils. It is a cool find. And i will do some microscope work on it at the natural historie museum depot but that will only be i march at the latest.