greisen
Noun: A type of granitic rock that has been altered by hot, acidic fluids, resulting in a composition primarily of quartz and mica (typically light-colored mica like muscovite). It is a rock formed by a geological process called greisenization.
The word "greisen" is a specialized geological term. It is used as a countable noun to refer to a specific rock type or rock body. * The miners explored a vein of greisen rich in tin ore. * This deposit is characterized by extensive greisen zones. * The geologist identified the rock sample as greisen.
- Greisenization (n): The hydrothermal alteration process that forms greisen. This related term is used to describe the action, while "greisen" names the resulting rock.
- The greisenization of the granite released metals into the fluid.
- Greisenized (adj): Describing a rock that has undergone the process to become greisen.
- The greisenized granite host rock contains valuable minerals.
As a specialized geological term, "greisen" does not have other common meanings outside this context.
- Altered granite
- Hydrothermally altered rock (this is a broader, descriptive synonym)
There are no common idioms using the word "greisen."
There are no phrasal verbs using the word "greisen."
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a granitic rock composed of quartz and mica
