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Geology
Alphabetical index
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Granulite
Granulite is metamorphic rock formed by high temperatures ...
Greisen
Greisen is a micaceous rock occurring on the edge of granite ...
Growth twin
A growth twin results from the association of two (single ...
Hadean
The Hadean (4.55 to 3.9 bn years ago) is the oldest eon in ...
Haüy indices
Haüy indices are small integers (p, q, r) used to define the ...
Heavy minerals
Heavy minerals are those with a density higher than 2.87 ...
Heavy mud
Heavy mud is a mixture of water, clay and barytine injected ...
Hexagonal system
The hexagonal system is a crystal system of which the unit ...
Holocene
The Holocene epoch is the second Quaternary epoch. It began ...
Holohedry
A holohedric crystal is one that has all the symmetry ...
Hololecratic
Hololecratic rocks are igneous rocks rich in light minerals ...
Hornfel
Hornfel is a rock created by contact metamorphism, of ...
Hotspot
In geology, a hotspot is a place on the surface of a planet ...
Hydraulic fracture
Hydraulic fracturing (fracking) is the massive fissuring of ...
Hydrogeology
Hydrogeology is the science of subterranean water. This ...
Hydromorphy
Hydromorphy is the saturation of the pores of soil by water ...
Hydrothermal deposit
A hydrothermal deposit is a deposit formed by the deposit of ...
Hyperaluminous
Hyperaluminous describes a rock with an Al/(Na+K+2Ca) ratio ...
Hypocentre
The hypocentre is the starting point of seismic rupture on a ...
Ice core
An ice core is a cylindrical ice sample taken from the ice ...
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