Examlex
In what mode of 802.11i operation is a central authentication server used?
Quartzite
A very hard rock consisting chiefly of quartz grains joined by secondary silica that causes the rock to break across rather than around the grains; formed by metamorphism or by silica cementation of a quartz sandstone.
Slate
A compact, fine-grained, low-grade metamorphic rock that possesses slaty cleavage.
Hornfels
Hornfels is a metamorphic rock formed by the contact between mudstone or other clay-rich rock and a hot igneous body, characterized by its hardness and fine grain.
Greenstone
Metamorphosed basalt or other mafic volcanic rock, typically found in ancient geological formations.
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