Rocks

Chalk is a soft, white, highly porous biochemical sedimentary rock composed almost entirely of calcite (CaCO₃) derived from the remains of coccolithophores, microscopic marine...

Lamprophyre is ultrapotassic igneous rock that is occurring as dikes, lopoliths, loccoliths, stocks and small intrussion. It is alkaline silica-undersaturated mafic or ultramafic rocks...

Amphibolite, a rock composed in large part or dominantly of minerals of the amphibole institution. The term has been implemented to rocks of both igneous or metamorphic foundation. In igneous rocks, the term hornblendite is greater not unusual and restrictive; hornblende is the maximum not unusual amphibole and is traditional of such rocks.

Siltstone is a clastic sedimentary rock that formed from grains whose sized between that of sandstone and mudstone. It can found different environmental conditions...

Mudstone is a really pleasant-grained sedimentary rock consisting of a aggregate of clay and silt-sized particles. Terms including claystone and siltstone are often used in location of mudstone, although these consult with rocks whose grain length falls inside a good deal narrower stages and underneath near exam those are frequently technically mudstones. Shale is frequently used to explain mudstones that are difficult and fissile (wreck along bedding planes). Marl is regularly used to explain carbonate-rich tender mudstones.

Diorite is coarse – grained intrusive igneous rock that commonly mineralogy is plagioclase feldspar and dark colored minerals such as hornblende and biotite.It usually occurs dikes, sills and intrusions with continental crust . Diorite is usually grey to dark-grey in colour, but it can also be black or bluish-grey, and frequently has a greenish cast.

Lapilli, which means "little stones" in Italian, refers to small rock fragments ejected during volcanic eruptions. These fragments typically range in size from 2...

Nuummite is a rare and unique metamorphic rock that is prized for its distinctive iridescent play of colors. It is primarily composed of two...

Scoria is a type of volcanic rock that forms from the solidification of molten lava. It is commonly found around and on the surface...

Basalt is the most abundant volcanic rock on Earth, covering more than 90% of the ocean floor and large continental regions shaped by ancient...

Breccia is a rock shaped from angular gravel and boulder-sized clasts cemented collectively in a matrix. The angular nature of the clasts suggests that they have now not been transported very far from their source. There are numerous modes of formation for breccia. Some constitute consolidated material accumulated on steep hill slopes or on the foot of cliffs.

Diatomite, also known as diatomaceous earth, is a naturally occurring, soft, siliceous sedimentary rock that is easily crumbled into a fine white to off-white...