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  2. Terra preta - Wikipedia

    en.wikipedia.org/wiki/Terra_preta

    Terra preta (Portuguese pronunciation: [ˈtɛʁɐ ˈpɾetɐ], literally "black soil" in Portuguese), also known as Amazonian dark earth or Indian black earth, is a type of very dark, fertile anthropogenic soil found in the Amazon Basin.

  3. Soil color - Wikipedia

    en.wikipedia.org/wiki/Soil_color

    Hue: indicates the dominant spectral (i.e., rainbow) color, which in the soil is generally yellow or red. Each page of the Munsell soil color book displays a different hue. Examples include 10YR, 5YR, and 2.5Y. Value: indicates lightness or darkness. The value increases from the bottom of each page to the top, with lower numbers representing ...

  4. Terracotta - Wikipedia

    en.wikipedia.org/wiki/Terracotta

    Terracotta and tile were used extensively in the town buildings of Victorian Birmingham, England. Terracotta was marketed as a miracle material, largely impervious to the elements. Terracotta, however, can be damaged by water penetration, exposure, or failure through faulty design or installation.

  5. Architectural terracotta - Wikipedia

    en.wikipedia.org/wiki/Architectural_terracotta

    The Bell Edison Telephone Building in Birmingham is a late 19th-century red brick and architectural terracotta building. Architectural terracotta refers to a fired mixture of clay and water that can be used in a non-structural, semi-structural, or structural capacity on the exterior or interior of a building. [1]

  6. Clay - Wikipedia

    en.wikipedia.org/wiki/Clay

    Clay is a type of fine-grained natural soil material containing clay minerals [1] (hydrous aluminium phyllosilicates, e.g. kaolinite, Al 2 Si 2 O 5 4). Most pure clay minerals are white or light-coloured, but natural clays show a variety of colours from impurities, such as a reddish or brownish colour from small amounts of iron oxide. [2] [3]

  7. Clay mineral - Wikipedia

    en.wikipedia.org/wiki/Clay_mineral

    Clay minerals can be classified as 1:1 or 2:1. A 1:1 clay would consist of one tetrahedral sheet and one octahedral sheet, and examples would be kaolinite and serpentinite. A 2:1 clay consists of an octahedral sheet sandwiched between two tetrahedral sheets, and examples are talc, vermiculite, and montmorillonite.

  8. Earthenware - Wikipedia

    en.wikipedia.org/wiki/Earthenware

    Terracotta flower pots with terracotta tiles in the background Due to its porosity, fired earthenware, with a water absorption of 5-8%, must be glazed to be watertight. [ 11 ] Earthenware has lower mechanical strength than bone china, porcelain or stoneware, and consequently articles are commonly made in thicker cross-section, although they are ...

  9. Conservation and restoration of ancient Greek pottery

    en.wikipedia.org/wiki/Conservation_and...

    The information learned from vase paintings forms the foundation of modern knowledge of ancient Greek art and culture. Most ancient Greek pottery is terracotta, a type of earthenware ceramic, dating from the 11th century BCE through the 1st century CE. The objects are usually excavated from archaeological sites in broken pieces, or shards, and ...

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