Rocks

Rhyolite is a felsic extrusive rock. Due to the high silica content, rhyolite lava is very viscous. It flows slowly, like tooth paste squeezed out of a tube, and tends to pile up and biçim lava domes. If rhyolite magma is gas rich it can erupt explosively, forming a frothy solidified magma called pumice (a very lightweight, light-coloured, vesicular form of rhyolite)

Hornfels is a fine-grained metamorphic rock These properties are because of first-class grained non-aligned crystals with platy or prismatic behavior. Hornfels is the group designation for a series of contact metamorphic rocks which have been baked and indurated by means of the warmth of intrusive igneous loads and had been rendered massive, difficult, splintery, and in a few cases exceedingly tough and sturdy.

Pegmatite is an igneous rock that form end of the stage a magma’s crystallization. Pegmatites contain exceptionally large crystals and they contain rarely minerals than other types of rocks. They have interlocking crystals usually larger than 2.5 cm in size. Generally most Pegmatites are found in sheets of rock that are dikes and veins Also near large masses of igneous rocks called batholiths.

Coquina is a sedimentary rock that is primarily composed of fragmented shell and coral debris. The name "coquina" is derived from the Spanish word...

Obsidian is an igneous rock that forms when molten rock material cools so rapidly that atoms are unable to arrange themselves into a crystalline structure. It is an amorphous material known as a "mineraloid." The result is a volcanic glass with a smooth uniform texture that breaks with a conchoidal fracture .

Conglomerateis a sedimentary rock shaped from rounded gravel and boulder sized clasts cemented collectively in a matrix. The rounding of the clasts indicates that they've been transported a long way from their authentic source (e.G. Through a river or glacier), or that they've resided in a high energy surroundings for a while

Larvikite is a unique and visually striking igneous rock that belongs to the family of feldspar-rich plutonic rocks known as syenites. It is primarily...

Trachyte, light-coloured, very fine-grained extrusive igneous rock that is composed chiefly of alkali feldspar with minor amounts of dark-coloured minerals such as biotite, amphibole, or pyroxene. Compositionally, trachyte is the volcanic equivalent of the plutonic (intrusive) rock syenite. Most trachytes show porphyritic texture in which abundant,

Basalt is the most common rock on Earth’s surface. Specimens are black in color and weather to dark green or brown. Basalt is rich in iron and magnesium and is mainly composed of olivine, pyroxene, and plagioclase. Most specimens are compact, fine-grained, and glassy. They can also be porphyritic, with phenocrysts of olivine, augite, or plagioclase. Holes left by gas bubbles can give basalt a coarsely porous texture.

Arkose is a type of sedimentary rock characterized by its high mineral content of feldspar, particularly orthoclase. It is often considered a type of...

Septarian, also known as Septarian Nodule or Dragon Stone, is a distinctive type of sedimentary rock that is characterized by its unique, striking appearance....

Flint is a naturally occurring sedimentary rock composed primarily of microcrystalline quartz, or silicon dioxide (SiO2). It is renowned for its historical significance and...