Slate in the context of "Metamorphic rock"

A blackboard or a chalkboard is a reusable writing surface on which text or drawings are made with sticks of calcium sulphate or calcium carbonate, better known as chalk.

Blackboards were originally made of smooth, thin sheets of black or dark grey slate stone.

A quarry is a type of open-pit mine in which dimension stone, rock, construction aggregate, riprap, sand, gravel, or slate is excavated from the ground. The operation of quarries is regulated in some jurisdictions to manage their safety risks and reduce their environmental impact.

The word quarry can also include the underground quarrying for stone, such as Bath stone.

A boundary marker, border marker, boundary stone, or border stone is a robust physical marker that identifies the start of a land boundary or the change in a boundary, especially a change in direction of a boundary. There are several other types of named border markers, known as boundary trees, pillars, monuments, obelisks, and corners. Border markers can also be markers through which a border line runs in a straight line to determine that border. They can also be the markers from which a border marker has been fixed.

Bluestone is a cultural or commercial name for a number of natural dimension or building stone varieties, including:

• basalt in Victoria, Australia, and in New Zealand
• dolerites in Tasmania, Australia; and in Britain (including Stonehenge)
• feldspathic sandstone in the US and Canada
• limestone in the Shenandoah Valley in the US, from the Hainaut quarries in Soignies, Belgium, and from quarries in County Carlow, County Galway and County Kilkenny in Ireland
• slate in South Australia

It is unrelated to human-made blue brick.

The lithology of a rock unit is a description of its physical characteristics visible at outcrop, in hand or core samples, or with low magnification microscopy. Physical characteristics include colour, texture, grain size, and composition. Lithology may refer to either a detailed description of these characteristics, or a summary of the gross physical character of a rock. Examples of lithologies in the second sense include sandstone, slate, basalt, or limestone.

Lithology is the basis of subdividing rock sequences into individual lithostratigraphic units for the purposes of mapping and correlation between areas. In certain applications, such as site investigations, lithology is described using a standard terminology such as in the European geotechnical standard Eurocode 7.

Kavaklıdere is a municipality and district of Muğla Province, Turkey. Its area is 302 km, and its population is 10,909 (2022). It is notable for its marble and slate industry and the vast forests extending across the district. Its marbles exported to Italy are usually re-exported by that country under Italian labels.

Formerly a township part of Yatağan District, it was made into a separate district in 1990.

The Research Range (Russian: Исследовательский хребет) is a mountain range at the northern end of the Ural Mountains. It extends north of the Arctic Circle, and forms the border between the Komi Republic and the Khanty–Mansi Autonomous Okrug. The Research Range is 175 km long and the highest point is Mount Narodnaya (Гора Народная) or People's Mountain, at 1,894 m.

The Research Range starts approximately at Mount Narodnaya and runs northeastward past Vorkuta almost to the Kara Sea and the Arctic Ocean. The primary rocks are metamorphic, mostly quartzites and slate. There are numerous glaciers near the tops and on the upper slopes of the mountains, the rest is mostly arctic desert and tundra. In the foothills and steep river valleys, there is some taiga forest.

The little penguin (Eudyptula minor) is the smallest species of penguin in the world, and originates from New Zealand. It is commonly known as the fairy penguin, little blue penguin, or blue penguin, owing to its slate-blue plumage and is also known by its Māori name kororā. It is a marine neritic species that dives for food throughout the day and returns to burrows on the shore at dusk. Eudyptula minor feathers are dense in melanosomes, which increase water resistance and give them their unique blue colour.

The Australian little penguin (Eudyptula novaehollandiae), from Australia and the Otago region of New Zealand, was initially described as Spheniscus novaehollandiae in 1826 and was later classified as Eudyptula minor novaehollandiae, a subspecies of the little penguin.