The molten matter within the earth, the source of the material of lava flows, dikes of eruptive rocks, etc.
Mud or fine earth deposited from running or standing water.
A relatively small (sand- to boulder-sized) fragment of debris in a solar system that produces a meteor when it hits the atmosphere
A mineral consisting, like quartz, of silica, but inferior to quartz in hardness and specific gravity, of the chemical formula SiO2·nH2O.
A form of fine-grained quartz that is nearly transparent or has a milky translucence; it fractures conchoidally.
A mineral with orthorhombic crystals, Ca2Al3(SiO4)(Si2O7)O(OH).
any of several hard minerals of cubic symmetry that are mixed oxides of magnesium and aluminium and are used as gemstones of various colours
one of the major groups of rock that makes up the crust of the Earth; formed by the deposition of either the weathered remains of other rocks, the results of biological activity, or precipitation from solution
A semi-precious stone, one of the two types of stone commonly referred to as jade, (the other being jadeite).
The name of a group of hydrous aluminosilicate minerals characterized by highly perfect cleavage, so that they readily separate into very thin leaves, more or less elastic.
one of the major groups of rock that makes up the crust of the Earth; formed by the deposition of either the weathered remains of other rocks, the results of biological activity, or precipitation from solution
The name of a group of hydrous aluminosilicate minerals characterized by highly perfect cleavage, so that they readily separate into very thin leaves, more or less elastic.