Compare and contrast sedimentary rocks that have a granular texture with sedimentary rocks that have a nongranular texture.
I have worked on this, and this is a question following an experiment so it's kind of hard to explain. The rocks in the experiment were coquina limestone, sandstone, shale, melaconglomerate, and rock salt. Tell me if you think this is ok: The sedimentary rocks that have a granular texture are coquina limestone, sandstone, and melaconglomerate. The sedimentary rocks that have a nongranular texture are shale and rock salt. The granular rocks are made of large sand or pebble grains but the nongranular rocks are not grainy or they have clay. The granular rocks are flaky, gritty, and the sediments are easily seen in some but the non granular rocks have no reaction to acid ,so they don't contain calcite, and some are soft. All the rocks have minerals in them, like rock salt has halite and sandstone has quartz. Melaconglomerate has smaller mineral fragments. Most of the granular rocks are detrital, except for coquina limestone which is organic and the nongranular rocks are detrital and chemical.
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That looks like you have made a good analysis. I would suggest one improvement. Talk about one type at a time. Use paragraph separation so that it is easy to see what the differences are.
That's what I said but in a shortened version, Jenny
To compare and contrast sedimentary rocks with a granular texture and those with a nongranular texture, we need to understand the characteristics of each type of rock.
Sedimentary rocks with a granular texture are composed of grains or particles that are visible to the naked eye. These grains can be different sizes, shapes, and compositions. Examples of granular sedimentary rocks include sandstone, conglomerate, and breccia. Here are some key features of granular sedimentary rocks:
1. Grain size: Granular rocks have varying grain sizes, depending on the type of rock. For example, sandstone consists of small grains of sand, while conglomerate contains larger pebbles and cobbles.
2. Grain sorting: Granular rocks can have either well-sorted or poorly-sorted grains. Well-sorted grains are similar in size, indicating long transportation distances, while poorly-sorted grains have a wide range of sizes, suggesting shorter transportation distances.
3. Grain shape: Granular rocks may have rounded or angular grains. Rounded grains typically result from transportation and weathering, while angular grains may suggest limited transport or proximity to the source.
In contrast, sedimentary rocks with a nongranular texture lack visible grains or particles. Instead, they have a homogeneous or cryptocrystalline appearance. Examples of nongranular sedimentary rocks include limestone, chert, and shale. Here are some characteristics of nongranular sedimentary rocks:
1. Composition: Nongranular rocks are often made up of microscopic crystals, microfossils, or organic matter. For instance, limestone is primarily composed of calcite crystals, while chert consists of microcrystalline quartz.
2. Texture: Nongranular rocks often exhibit a smooth, compact, or layered texture. Limestone can have a crystalline texture, whereas shale often displays a finely laminated texture due to the compression of clay particles.
3. Fossil content: Nongranular rocks may contain abundant fossils or organic remains due to the preservation of organisms within the compacted sediment. Limestone, for example, frequently contains fossilized shells or coral fragments.
In summary, sedimentary rocks with a granular texture are characterized by visible grains of varying sizes, shapes, and compositions, while sedimentary rocks with a nongranular texture lack visible grains and are often more homogeneous or cryptocrystalline in appearance. The presence of visible grains, grain size and sorting, grain shape, and fossil content are some of the key factors that differentiate these two types of sedimentary rocks.