What is the definition of groundmass?

Definition of groundmass : the fine-grained or glassy base of a porphyry in which the larger distinct crystals are embedded.

What is groundmass geology?

groundmass. / (ˈɡraʊndˌmæs) / noun. the matrix of igneous rocks, such as porphyry, in which larger crystals (phenocrysts) are embedded.

What is the relationship between phenocrysts and groundmass?

A phenocryst is an early forming, relatively large and usually conspicuous crystal distinctly larger than the grains of the rock groundmass of an igneous rock. Such rocks that have a distinct difference in the size of the crystals are called porphyries, and the adjective porphyritic is used to describe them.

What is a phenocrysts in geology?

A phenocryst is a large crystal in an igneous rock. It is a cognate crystal, almost invariably early formed, and is genetically distinct from a xenocryst (Iddings, 1889). Its derivation is from Greek phaneros, conspicuous, and kristallos, a crystal.

What is a Xenocryst in geology?

A xenocryst is an individual foreign crystal included within an igneous body. Examples of xenocrysts are quartz crystals in a silica-deficient lava and diamonds within kimberlite diatremes.

What is the difference between matrix and cement?

Matrix is the fine-grained stuff (silt and clay size) that was in the sediment along with the sand whereas cement is the mineral matter, introduced later, that binds the sediment into rock.

What is the meaning of phaneritic?

[ făn′ə-rĭt′ĭk ] Of or relating to an igneous rock in which the crystals are so coarse that individual minerals can be distinguished with the naked eye.

What is phaneritic and aphanitic?

APHANITIC TEXTURE – Igneous rocks that form on the earth’s surface have very fine-grained texture because the crystals are too small to see without magnification. PHANERITIC TEXTURE – Igneous rocks with large, visible crystals because the rock formed slowly in an underground magma chamber.

Is porphyry a marble?

The Roman emperors had a preference for porphyry, the red marble that was extracted from Mons Porphyretes, from a quarry that was in the eastern Egyptian desert and the only one from which the purple porphyry was extracted.

Is porphyry a crystal?

Porphyry (/ˈpɔːrfəri/ POR-fə-ree) is a textural term for an igneous rock consisting of coarse-grained crystals such as feldspar or quartz dispersed in a fine-grained silicate-rich, generally aphanitic matrix or groundmass. The larger crystals are called phenocrysts.

How is groundmass created?

In lavas, the fine groundmass is formed when the magma is erupted on to the Earth’s surface and is cooled rapidly by air convection over the flow.

What’s the difference between xenolith and Xenocryst?

Xenocrysts are a type of xenolith—one type of rock trapped in another type of rock. Here, the crystal pyroxene is trapped in the volcanic kimberlite. A xenolith is a piece of rock trapped in another type of rock. Most of the time, a xenolith is a rock embedded in magma while the magma was cooling.

Is Garnet a xenolith?

Clinopyroxene, olivine, and garnet constitute the bulk of the xenoliths, and orthopyroxene is present in small amounts.

Is lithology and geology the same?

The main difference between lithology and geology is that lithology describes the properties of a unit of rock, whereas geology describes the occurrence and changing of rock on Earth’s crust over a long time period.

Is lithology a part of geology?

Geology has several branches that deepen the studies of different parts. One of the branches of geology is lithology. It is the science that studies rocks, including the origin, age, composition, structure and distribution throughout the planet.

What is matrix in concrete?

The concrete matrix phase, composed of mineral aggregates glued together with a binder, supports the functional fillers and holds them in place. From: Self-Sensing Concrete in Smart Structures, 2014.

What is matrix in mortar?

Cement and lime These ingredients are called the ‘matrix’. The matrix causes the mortar to set. The matrix can be cement and rock lime or hydrated lime. Cement is made of clay and chalk. The lime provides water retention, elasticity, workability and adhesion.