Gimelist
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Name of majorite endmember $\ce{Mg3(FeSi)Si3O12}$
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3 votes

Yes, it's called (unsuprisingly) majorite. This is an IMA-approved name, first described from a meteorite. More information: https://www.mindat.org/min-2546.html

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Why the "Mission to Earth’s core" proposal suggests using liquid iron instead of lead?
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I've already commented on this before here. This will not work regardless of whether this is iron or lead or anything else. The fact that it was published in Nature does not mean it is true, always ...

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Why don't pyroxenites and peridotites appear in Streckeisen's QAPF diagram?
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3 votes

Why don't pyroxenites and peridotites appear on this diagram? Because they do not have any quartz, feldspars, or felspathoids. The same Wikipedia page also says this: QAPF diagrams are also not ...

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Why is the core of Earth in a reduced state? ($\text{Fe}$ and $\text{Ni}$)
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Because there wasn't enough oxygen to oxidise all of it. There is only so much oxygen on Earth. Most of it went to oxidise the elements that have higher affinities to oxygen: silicon, magnesium, ...

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Why Do Supercontinents Form?
3 votes

Just to reiterate some of the points previously said here: Continental crust fragments that collided are sticky. This results in mountain belts that essentially "glue" the two crusts together. ...

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Radiometric dating data sets
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3 votes

It sounds like there are two primary ones: No, these are not the two "primary ones". The method used depends on what you are dating, and what age you expect it to be. Radiocarbon dating is relevant ...

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Subrelluric forces in a volcanic eruption
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This term does not exist in volcanology. I can’t even think of a similar sounding term that can be misheard in the song, or misheard by the authors and then put in the song. It’s possible it exists ...

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Why are the mountains predominately grey or dark brown?
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3 votes

...which allow for exposure of various rocks, still mountains are mostly grey/brown. The colourful minerals are apparent when you look up close. When you look from far away, the minerals are all ...

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Can cooled/hardened lava rock return to a molten state?
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3 votes

Yes, at least partially. It is important to remember that a "rock" usually does not have a single melting point. It melts over an interval. Igneous (magmatic) rocks are made of combination of ...

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Was climate change inevitable anyway, or is there more to it?
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3 votes

Earth's climate has changed in the past and will change in the future. It would have changed even if we didn't start spewing enormous amounts of CO2 to the atmosphere. The main difference here is the ...

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How can I test my house water supply for hydrocarbon presence?
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This question might be better suited for Chemistry or another place, and I'm not certain Earth Science is the place for it. Without being an expert on groundwater, water supplies, or hydrocarbons I ...

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Could the earth be much older than the currently accepted number?
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The ages are not the only piece of information that we have. Gerrit covered most of the age issue in his answer. To summarise: We know the age of the solar system (4.5-4.6) and the oldest material we ...

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Why don't forest fires in Western Australia get as much attention as forest fires in the southeast of the country (including SA)?
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3 votes

Forest fires, and natural disasters in general, get attention when they affect people. Bush fires outside of metropolitan Perth or far away from populated areas do not affect many people. Therefore, ...

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Before the Great Oxygenation Event, where was the oxygen?
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I'd like to add to the other answers. Yes, it is correct that photosynthesis by cyanobacteria caused the rise of atmospheric oxygen. Some important points to talk about: Estimated fossil fuels are ...

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How vertically deep do lava conduits go?
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3 votes

As mentioned in the comments, lave caves and tubes are surface features. You get a lava tube when there's a lava flow and the external part in contact with air (or water) cools down and solidifies ...

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Which Earth minerals would Moon colonists miss the most?
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Which Earth minerals would Moon colonists miss the most? tl;dr All of them. As mentioned in the other answers here, it's about economics. Extracting an element from a mineral requires energy, ...

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Aspiring Geophysicist
3 votes

How flexible is your degree? I would suggest doing earth sciences with as many quantitative electives as possible. In grad school, you will have the chance to make up for any missing knowledge or ...

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gamma ray burst, extinction-level event
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3 votes

As bon noted in the comments, that it the time it would take the gamma rays to reach Earth. Gamme rays travel at the same speed as all other forms of electromagnetic radiation, including visible light,...

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Are Helium 3 and 4 being produced by earth's core?
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Are Helium 3 and 4 being produced by earth's core? tl;dr no. The paper you are referring to has major flaws in it. Claims that should not be in any respectable scientific journal such as: ...the ...

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What is the CI chondrite concentration of REEs/rare metals, in ppm/grams per ton?
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3 votes

You should start with the GERM Reservoir Database. Not the easiest to use website, but the most comprehensive. You can look up elemental concentrations in all kinds of "reservoirs", including ...

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Which one is the correct concept of Continental Crust and Oceanic Crust?
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3 votes

The SiAl-SiMa classification is very general. The continental crust is much more varied than that, but it is ok for a first approximation. The oceanic crust is dominantly mafic (aka SiMa), composed ...

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Melting basalt on the lunar surface - what would the resulting material be like?
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Melting lunar dust of basaltic composition will result (unsurprisingly) in basalt lava. There might be some volatile loss - if for some reason the basalt had some H2O or CO2 trapped in the solid you ...

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Ions & elements, which is the correct terminology to use when discussing chemical compounds in Earth Science?
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Elements are just one specific type of atom. Magnesium, oxygen, sulfur, etc. These are all elements. Compounds are several different types of atoms (that is, elements) bonded together. For example, ...

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What is the difference between mineral groups and series?
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3 votes

Yes, there is a difference. A mineral series represents mineral which have a well defined solid solution. One of the most known examples is olivine: olivine is not a strictly defined chemical ...

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Are all natural diamonds made of organic carbon material?
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But did plants and trees of 300 million years ago sink so deep? 300 million years ago (Carboniferous) was a time when large amount of organic carbon was buried to a depth of several kilometres and ...

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Is Desert Sandstone a chemical sedimentary rock?
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3 votes

No, it's not. The overwhelming majority of the material in the rock is clastic, not chemical. Chemical sedimentary rocks are rocks where (almost) all of the material was precipitated, such as ...

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What are the dominant elements that oxygen is bonded to on earth?
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This answer is basically an expanded version of my comments on this answer here. If you consider the crust and the mantle, then the most abundant metals are magnesium, silicon, iron, nickel, calcium, ...

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Can miniature shells be seen in Earth's sand at this resolution?
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3 votes

Quoting from the NASA website: The image covers an area 1.4 inches by 1.1 inches (3.6 by 2.7 centimeters). It was taken by the Mars Hand Lens Imager (MAHLI) camera on the rover's arm on Dec. 5, ...

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Old moon in the new moon's arm
3 votes

You can think of it as the "reverse" of moonshine. When you walk outside at night and there's a full moon, you can actually see quite a lot around you. Same thing - this happens on the moon when ...

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What was the likely composition of Earth's early crust (how did crustal composition evolve)?
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3 votes

Gordon's answer is correct to a first order approximation. However, the zircons that were found in Jack Hills are from the Hadean, more than 4 billion years ago. The fact that zircons that old exist ...

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