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  2. Turquoise - Wikipedia

    en.wikipedia.org/wiki/Turquoise

    Turquoise. Turquoise is an opaque, blue-to-green mineral that is a hydrous phosphate of copper and aluminium, with the chemical formula Cu Al 6(PO 4)4(OH)8·4 H 2 O. It is rare and valuable in finer grades and has been prized as a gemstone for millennia due to its hue.

  3. Composite material - Wikipedia

    en.wikipedia.org/wiki/Composite_material

    A black carbon fibre (used as a reinforcement component) compared to a human hair. Composites are formed by combining materials together to form an overall structure with properties that differ from that of the individual components. A composite material (also called a composition material or shortened to composite, which is the common name) is ...

  4. Old Copper complex - Wikipedia

    en.wikipedia.org/wiki/Old_Copper_complex

    The Old Copper complex or Old Copper culture is an archaeological culture from the Archaic period of North America's Great Lakes region. Artifacts from some of these sites have been dated from 7500 to 1000 BCE. [1][page needed] It is characterized by widespread copper artifacts, including tools and weapons, as well as ornamental objects.

  5. Marble - Wikipedia

    en.wikipedia.org/wiki/Marble

    Marble is a metamorphic rock consisting of carbonate minerals (most commonly calcite (CaCO 3) or dolomite (CaMg (CO 3) 2) that have recrystallized under the influence of heat and pressure. [1] It has a crystalline texture, and is typically not foliated (layered), although there are exceptions. In geology, the term marble refers to metamorphosed ...

  6. Carrara marble - Wikipedia

    en.wikipedia.org/wiki/Carrara_marble

    Carrara marble, or Luna marble (marmor lunense) to the Romans, is a type of white or blue-grey marble popular for use in sculpture and building decor. It has been quarried since Roman times in the mountains just outside the city of Carrara in the province of Massa and Carrara in the Lunigiana , the northernmost tip of modern-day Tuscany , Italy.

  7. Engineered stone - Wikipedia

    en.wikipedia.org/wiki/Engineered_stone

    Engineered stone. Engineered stone is a composite material made of crushed stone bound together by an adhesive to create a solid surface. The adhesive is most commonly polymer resin, with some newer versions using cement mix. This category includes engineered quartz (SiO 2), polymer concrete and engineered marble stone. [1]

  8. Artificial stone - Wikipedia

    en.wikipedia.org/wiki/Artificial_stone

    Artificial stone. German doorway in cast stone. Artificial stone is a name for various synthetic stone products produced from the 18th century onward. Uses include statuary, architectural details, fencing and rails, building construction, civil engineering work, and industrial applications such as grindstones .

  9. Conservation and restoration of movable cultural property

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

    Types of metals include "gold, silver, copper, iron, lead, tin, nickel, zinc, aluminum, chromium, titanium, and their alloys". [22] Metal sculptures are prone to corrosion from air pollution and moisture in the air. [23] Interventive treatments for metals is an irreversible procedure that need consideration prior to work.

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