Breccia forms when shards of rock, over at least 0.08 inches in length, are cemented together a relatively short distance from where they were originally broken off. Often this occurs at the base of an outcrop of rock where mechanical weathering occurs.Know More
Breccia is a sedimentary rock where sharp, angular pieces of other rocks are stuck together. They can be bound together with either a mineral cement or a mix of smaller rock fragments. It is very similar to conglomerate, except conglomerate contains rounded pieces of rock instead of angular ones. Breccia constituents are sharp because they are not carried a great distance before becoming embedded in sediment. Otherwise, the edges would be worn down.
Breccia has no particular mineral composition, and is a term for any sedimentary rock matching its physical description. They are often a mix of different minerals, but if one type of mineral predominates, it can be called limestone breccia, granite breccia or whatever name best characterizes the source rock. Because of the variety of mineral compositions, the color and general appearance of breccias vary widely. There are few human uses for breccias, although the breccias from certain private quarries are used for various decorative applications.Learn more in Geology
Wind and rain erode rock to begin the formation of siltstone. The rock particles break down further as they travel with the water and then settle to the bottom of the water when it slows. Layers of silt accumulate, creating heat and pressure that cement the silt together into rock.Full Answer >
There is no definitive evidence to fully explain the formation of mica as the process is still under scientific study as of 2015. However, mica formation is said to be closely associated with the lack of orthoclase feldspar in pegmatites, which is where the mineral is predominantly found.Full Answer >
When an atom or group of atoms loses or gains electrons or protons, it becomes an ion. The primary difference between normal atoms and ions is that normal atoms typically have a neutral charge while ions are either positively or negatively charged. When atoms gain protons or lose electrons, they become positively charged. By contrast, atoms that lose protons or gain electrons become negatively charged.Full Answer >
Shale forms from the pressure of layers of sediment compressing bits of silt that settle into the clay on the bottom of bodies of water. The compressed clay and silt become shale over time. Shale is a sedimentary rock.Full Answer >