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• Methyl orange, sodium salt
  ...tt in 1876; and Z. Roussin in 1876. As an indicator, methyl orange forms a red color below pH 3.1, turns orange above pH 4.4 and becomes yellow in alkalin [[inorganic%20acid|mineral acids]]. Methyl orange is also used for dyeing
  2 KB (247 words) - 14:22, 1 October 2022
• Cadmium yellow
  ...(cadmopone) pigments. Cadmium sulfide also occurs in minor amounts in the mineral greenockite. * Soluble in concentrated mineral acids with the evolution of H2S. Insoluble in water.
  3 KB (434 words) - 14:59, 11 May 2022
• Lead
  ...ad has also been used for pigments ([[lead white]], [[litharge]], [[orange mineral]], etc.) and as a component in pottery glazes. It has also been used for ro Lead is on the ILFI [[Red list of Materials|Red list]] of building materials.
  4 KB (592 words) - 14:43, 3 November 2023
• Tenorite
  ...as an alteration product of [[cuprite]] forming a thin dark layer over the red. The presence of tenorite as a patina may indicate the object was heated be
  2 KB (269 words) - 11:35, 8 December 2022
• Rubidium
  ...rhodizite, lepidolite, and carnallite. It is also present in sea water and mineral springs. Rubidium was discovered by Robert Bunsen and Gustav Kirchhoff in 1 * Flame color is dark red to violet.
  2 KB (251 words) - 09:52, 28 June 2022
• Zircon
  ...rilliant gemstones because of their high refractive index. Clear yellow to red zircon, called [[hyacinth]] or jacinth, is also used as a gem. Ancient gems * Pleochroism = moderate purplish red to brown dichroism
  4 KB (545 words) - 14:54, 24 January 2023
• Asbestos
  ...several fibrous magnesium silicate minerals. The most widely used asbestos mineral is a type of serpentine called [[chrysotile|chrysotile]] (white asbestos). Asbestos is on the ILFI [[Red list of Materials|Red list]] of building materials.
  4 KB (554 words) - 14:32, 3 November 2023
• Topaz
  ...called topaz. In 1750, it was noted that yellow Brazilian topaz would turn red when heated and these were sold as Brazilian rubies. * Yellow topaz turns a soft red when heated
  4 KB (482 words) - 13:30, 4 January 2023
• Ultramarine violet
  ....); ultramarijn violet (Ned.); violeta de ultramarino (Port.); ultramarine red; ultramarine pink;
  2 KB (257 words) - 10:01, 23 June 2022
• Tourmaline
  ...an sapphire), brown (dravite), green (Brazilian emerald), red (rubellite), red/green parti-colored (watermelon) and, though rare, colorless (achroite). Op ...ack); tourmalin; turmaline; elbaite; indicolite (blue); rubellite (pink or red); dravite (brown); achroite (colorless); Brazilian sapphire (light blue); B
  4 KB (535 words) - 13:27, 4 January 2023
• Anhydrite
  ...strous sheen. It occurs in several colors such as white, gray, blue, pink, red, and lavender. Anhydrite was used in ancient Egypt for carved objects and v
  4 KB (486 words) - 14:00, 14 July 2023
• Strontium titanate
  ...rontium titanate is transparent and colorless, but may be doped to formed red, yellow,brown or blue.
  2 KB (283 words) - 10:53, 4 January 2023
• Rutile
  ...l. Small amounts of natural rutile may have been used as a pale yellow to red brown or nearly black pigment; however, it is difficult to grind and produc [[File:Rutilekes.jpg|thumb|Rultile mineral]]
  7 KB (1,050 words) - 10:55, 4 January 2023
• Steatite
  ...ne. Some ancient steatite carvings were glazed then fired which produced a mineral (enstatite) hard enough to scratch glass. Currently, soapstone is used for
  3 KB (449 words) - 15:03, 28 December 2022
• Zoisite
  An epidote type mineral used as an ornamental stone. Zoisite was named for Baron Zois van Edelstein * Pleochroism = strong; usually blue, purplish red and greenish yellow
  2 KB (310 words) - 13:09, 23 December 2022
• Acid
  3) turns [[litmus|litmus]] dye red, ...measured on the pH scale. A stronger acid has a lower pH value. Inorganic (mineral) acids, such as [[sulfuric%20acid|sulfuric]], [[nitric%20acid|nitric]], [[h
  2 KB (317 words) - 17:02, 19 April 2022
• Shellac
  [[File:MFA1991444 Shellac.jpg|thumb|Lacquer base of shellac and red ocher; MFA# 1991.444]] ...eotype]] and [[ambrotype]] cases, and gramophone records. Black pigmented, mineral-filled shellac was used for 78 rpm phonograph records, mirror frames, brooc
  5 KB (642 words) - 15:51, 30 May 2022
• Andalusite
  ...Connecticut). The stone is pleochroic and can exhibit a pink, gray, green, red, or bluish colors sometimes appearing to be iridescent. Andalusite occurs a ...eochroism = very strong, generally light yellowish green and dark brownish red
  3 KB (453 words) - 10:50, 21 December 2022
• Chromic acid
  Dark red deliquescent crystals of [[chromium trioxide]]. Chromic acid is made by mix Soluble in water, ethanol, mineral acids.
  2 KB (289 words) - 15:10, 29 May 2022
• Tanzanite
  A pale-color transparent mineral that has been used as a [[gemstone|gemstone]]. Tanzanite is a variety of [[ * Pleochroism = Strong; dichroism or trichroism, usually blue, purplish red and greenish yellow
  2 KB (316 words) - 15:25, 20 December 2022

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