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2. Rock (geology) - Wikipedia

   en.wikipedia.org/wiki/Rock_(geology)

   Most rocks contain silicate minerals, compounds that include silica tetrahedra in their crystal lattice, and account for about one-third of all known mineral species and about 95% of the earth's crust. [6] The proportion of silica in rocks and minerals is a major factor in determining their names and properties. [7]

3. List of rock types - Wikipedia

   en.wikipedia.org/wiki/List_of_rock_types

   Phosphorite – Sedimentary rock containing large amounts of phosphate minerals – A non-detrital sedimentary rock that contains high amounts of phosphate minerals; Sandstone – Type of sedimentary rock; Shale – Fine-grained, clastic sedimentary rock; Siltstone – Sedimentary rock which has a grain size in the silt range

4. List of minerals - Wikipedia

   en.wikipedia.org/wiki/List_of_minerals

   This is a list of minerals which have Wikipedia articles. ... Rock crystal (quartz) Rose quartz (pink variety of quartz) Roumanite (amber) Ruby (red gem corundum) S

5. Mineral - Wikipedia

   en.wikipedia.org/wiki/Mineral

   Rocks can also be composed entirely of non-mineral material; coal is a sedimentary rock composed primarily of organically derived carbon. [34] [38] In rocks, some mineral species and groups are much more abundant than others; these are termed the rock-forming minerals.

6. Geology - Wikipedia

   en.wikipedia.org/wiki/Geology

   Solidified lava flow in Hawaii Sedimentary layers in Badlands National Park, South Dakota Metamorphic rock, Nunavut, Canada. Geology (from Ancient Greek γῆ (gê) 'earth' and λoγία () 'study of, discourse') [1] [2] is a branch of natural science concerned with the Earth and other astronomical objects, the rocks of which they are composed, and the processes by which they change over time. [3]

7. List of U.S. state minerals, rocks, stones and gemstones

   en.wikipedia.org/wiki/List_of_U.S._state...

   Leaders of states in the U.S. which have significant mineral deposits often create a state mineral, rock, stone or gemstone to promote interest in their natural resources, history, tourism, etc. Not every state has an official state mineral, rock, stone and/or gemstone, however.