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2. Wulfenite - Wikipedia

   en.wikipedia.org/wiki/Wulfenite

   Crystals are deep red in color and usually very well-formed. Wulfenite was approved as the official state mineral of Arizona in 2017. [5] The Los Lamentos locality in Mexico produced very thick tabular orange crystals. Another locality is Mount Peca in Slovenia. The crystals are yellow, often with well-developed pyramids and bipyramids.

3. Sodium tetrachloroaurate - Wikipedia

   en.wikipedia.org/wiki/Sodium_tetrachloroaurate

   The conventional method of preparation of sodium tetrachloroaurate involves the addition of tetrachloroauric acid solution to sodium chloride or sodium carbonate to form a mixture. The mixture is stirred at 100 °C, and then subjected to evaporation, cooling, crystallization , and drying to obtain the orange crystals of sodium tetrachloroaurate.

4. Enhydro agate - Wikipedia

   en.wikipedia.org/wiki/Enhydro_agate

   Enhydro geode, found in Brazil. Enhydro agates are nodules, agates, or geodes with water trapped inside its cavity. [1] Enhydros are closely related to fluid inclusions, but are composed of chalcedony. The formation of enhydros is still an ongoing process, with specimens dated back to the Eocene Epoch. [2]

5. Ammonium dichromate - Wikipedia

   en.wikipedia.org/wiki/Ammonium_dichromate

   At room temperature and pressure, the compound exists as orange, acidic crystals soluble in water and alcohol. It is formed by the action of chromic acid on ammonium hydroxide with subsequent crystallisation. [3] The (NH 4) 2 Cr 2 O 7 crystal (C2/c, z = 4) contains a single type of ammonium ion, at sites of symmetry C 1 (2,3). Each NH +

6. Recrystallization (chemistry) - Wikipedia

   en.wikipedia.org/wiki/Recrystallization_(chemistry)

   Once the solution is saturated crystals can be formed. → Solvent added (clear) to compound (orange) to give compound solution (orange) → Vessel sealed but a small hole allows solvent vapour (clear) to slowly evaporate from compound solution (orange) over time to give crystals (orange) and a saturated solution (pale-orange).

7. Geode - Wikipedia

   en.wikipedia.org/wiki/Geode

   Very large amethyst and regular quartz geodes 'Crystal cave' is both an informal term for any large crystal-lined geode and also used for specific geoheritage locations such as the Crystal Cave (Ohio), discovered in 1887 at the Heineman Winery on Put-In-Bay, Ohio, the Cave of the Crystals (Mexico), and the Pulpi Geode, discovered in 1999 in Spain.

8. Orange water harbour remains 'real frustration' - AOL

   www.aol.com/news/orange-water-harbour-remains...

   Two years since a harbour's water turned orange, frustration continues over the lack of a solution. Tests have identified iron ochre getting into Whitehaven's Queens Dock in Cumbria through a ...

9. Cerium(IV) sulfate - Wikipedia

   en.wikipedia.org/wiki/Cerium(IV)_sulfate

   These salts are yellow to yellow/orange solids that are moderately soluble in water and dilute acids. Its neutral solutions slowly decompose, depositing the light yellow oxide CeO 2. Solutions of ceric sulfate have a strong yellow color. The tetrahydrate loses water when heated to 180-200 °C. It is insoluble in glacial acetic acid and pure (96 ...