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6 votes

What determines the color of light emitted by thermoluminescent stones?

Essentially all of it is a matter of molecular physics, just like with all other types of luminescence. The only difference is where the energy is coming from, how it’s retained, and how it’s released....
Austin Hemmelgarn's user avatar
5 votes

What determines the color of light emitted by thermoluminescent stones?

The light emitted by a mineral due to thermoluminescence is caused by electrons shedding extra energy obtained during radiation exposure; this can be in the form of heat, light, or ionising radiation. ...
Ash's user avatar
  • 4,550
3 votes

Simple explanation of what "preferential lattice expansion due to excessive magnesium adsorption", means

Dolomite is a form of calcite in which magnesium replaces some percentage of the calcium in what is otherwise a calcium carbonate rock. Magnesium has the same charge, and thus bonding behaviours, as ...
Ash's user avatar
  • 4,550
2 votes

Is the association of fluorescent minerals calcite, fluorite, and apatite with fluorescent rare-Earth minerals a coincidence?

No it is not by chance. As an ion, rare-Earth metals and compounds behave like alkaline Earth metals, so they form near each other. For example, neodymium has similar chemical properties to barium. ...
Lalith_Aditya's user avatar
2 votes

If the Earth's core were made up of copper/other metals other than iron-nickel alloy, what would the magnetosphere be like?

As explained in some comments, it is the dynamo effect from the flow of liquid metal that creates the magnetic field, not the magnetic properties the solid metal might reveal under surface conditions. ...
Oscar Lanzi's user avatar
  • 3,936
1 vote

What useful information could an ancient "mining compass" yield?

Geologists still use geological compasses in both open pit and underground mining to measure orientation of geological structures, as they map in the field, to analyze and document the geometry of ...
Fred's user avatar
  • 24.7k
1 vote

What is a good definition for "lattice bound" and is iron within octahedral sites of illite considered lattice bound or interstitial?

We definitely have +2 and +3 ions bonded within the same type of site. And it's not just iron; magnesium can become involved among the +2 ions and aluminum among the +3 ions. As for whether they are &...
Oscar Lanzi's user avatar
  • 3,936

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