Where is a good place to get a list of rock types ?
I аm аftеr a list thаt hаѕ second year amount knowledge οf thе broad types οf rocks.
A brеаk down οf sedimentary, metamorphic аnd igneous rocks wіth a decent explanation.
I’m nοt a Geology student οr Geologist bυt I hаνе аn interest іn, аnd keep fοr getting аll thе rock types.
Check this site. You can click on the links, and search around through the text. VERY HELPFUL!
Rocks are classified by mineral and chemical composition, by the texture of the constituent particles and by the processes that formed them. These indicators separate rocks into igneous, sedimentary and metamorphic. They may also be classified according to particle size, in the case of conglomerates and breccias or in the case of individual stones. The transformation of one rock type to another is described by the geological model called the rock cycle.
Igneous rocks are formed when molten magma cools and are divided into two main categories: plutonic rock and volcanic. Plutonic or intrusive rocks result when magma cools and crystallizes slowly within the Planet’s crust (example granite), even as volcanic or extrusive rocks result from magma reaching the surface either as lava or fragmental ejecta (examples pumice and basalt) .[1]
Sedimentary rocks are formed by deposition of either clastic sediments, organic matter, or chemical precipitates (evaporites), followed by compaction of the particulate matter and cementation during diagenesis. Sedimentary rocks form at or near the Planet’s surface. Mud rocks comprise 65% (mudstone, shale and siltstone); sandstones 20 to 25% and carbonate rocks 10 to 15% (mineral and dolostone).[1]
Metamorphic rocks are formed by subjecting any rock type (including previously-formed metamorphic rock) to different temperature and pressure conditions than those in which the original rock was formed. These temperatures and pressures are always higher than those at the Planet’s surface and must be sufficiently high so as to change the original minerals into other mineral types or else into other forms of the same minerals (e.g. by recrystallisation).There are also Foliated and nonfoliated rock types.
The three classes of rocks: the igneous, the sedimentary and the metamorphic — are subdivided into many groups. There are, but, no hard and quick boundaries between linked rocks. By increase or diminution in the proportions of their constituent minerals they pass by every gradation into one another, the distinctive structures also of one kind of rock may often be traced gradually merging into those of another. Hence the definitions adopted in establishing rock nomenclature merely correspond to selected points (more or less arbitrary) in a continuously graduated run. This is frequently urged as a reason for reducing rock classification to its simplest possible terms, and using only a few indiscriminate rock designations. But it is clear that many rumor has it that trivial differences tend regularly to recur, and have a real significance, and so long as any variation can be shown to be of this nature it deserves recognition