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6 votes
1 answer
133 views

What causes a change in composition from basanite to nephelinite?

5 votes
1 answer
74 views

why igneous phosphate rocks contain less uranium than sedimentary rocks?

2 votes
1 answer
115 views

What are the favourable conditions for the formation of porphyry copper deposits?

3 votes
1 answer
88 views

solubility of rare earth sulphides at different pH?

10 votes
2 answers
230 views

What makes the conditions at the core/mantle boundary ideal for aluminum to combine with other elements besides oxygen?

1 vote
0 answers
23 views

Oxygen fractionation rate of heated swimming pool in cold, dry air

1 vote
4 answers
213 views

Why is phosphorus concentrated in living organisms rather than the lithosphere, aesthenosphere, crust, mantle, core?

0 votes
0 answers
76 views

What is the theoretical limit for the deepest/largest cavities possible in Earth?

26 votes
0 answers
1k views

How are Mauna Loa $\ce{CO2}$ monthly trends computed?

13 votes
3 answers
8k views

What is the white coating "patina" we often see on deposited chalcedony/agate?

6 votes
4 answers
1k views

USGS' 2022 list of critical minerals lists 48 elements and only two minerals; why?

1 vote
2 answers
195 views

What is a reasonable method of estimating the volume percent of a mineral in a rock given some composition data?

0 votes
1 answer
86 views

How can the ratios of some elements isotopes provide the fractional abundance?

0 votes
2 answers
82 views

Is Enhanced Oil Recovery (EOR) volumetrically self-consistent?

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