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2. Tiger's eye - Wikipedia

   en.wikipedia.org/wiki/Tiger's_eye

   Tiger's eye (also called tiger eye) is a chatoyant gemstone that is usually a metamorphic rock with a golden to red-brown colour and a silky lustre.As members of the quartz group, tiger's eye and the related blue-coloured mineral hawk's eye gain their silky, lustrous appearance from the parallel intergrowth of quartz crystals and altered amphibole fibres that have mostly turned into limonite.

3. Pietersite - Wikipedia

   en.wikipedia.org/wiki/Pietersite

   Polished Pietersite. Pietersite is a commercial term for a variety of the mineral chalcedony.Originating from Namibia and China, where it is mined for use as a decorative stone due to its chaotic chatoyancy and brecciated structure.

4. Rookwood Pottery Company - Wikipedia

   en.wikipedia.org/wiki/Rookwood_Pottery_Company

   Tiger Eye produces a golden shimmer deep within the glaze; however, the results of this glaze were unpredictable. [ citation needed ] Rookwood also produced pottery in the Japonism trend, after Storer invited Japanese artist Kitaro Shirayamadani to come to Cincinnati in 1887 to work for the company. [ 6 ]

5. Quartz - Wikipedia

   en.wikipedia.org/wiki/Quartz

   [22] [27] However, there is a significant change in volume during this transition, [28] and this can result in significant microfracturing in ceramics during firing, [29] in ornamental stone after a fire [30] and in rocks of the Earth's crust exposed to high temperatures, [31] thereby damaging materials containing quartz and degrading their ...

6. List of gemstones by species - Wikipedia

   en.wikipedia.org/wiki/List_of_gemstones_by_species

   Eilat stone; Epidosite; Glimmerite; Goldstone (glittering glass) Hawk's eye; Helenite (artificial glass made from volcanic ash) Iddingsite; Kimberlite; Lamproite; Lapis lazuli; Libyan desert glass; Llanite; Maw sit sit; Moldavite; Obsidian; Apache tears; Pallasite; Peridotite (also known as olivinite) Siilinjärvi carbonatite; Soapstone (also ...

7. Lake Superior agate - Wikipedia

   en.wikipedia.org/wiki/Lake_Superior_agate

   Lake Superior Agate - Duluth, Minnesota. The Lake Superior agate is a type of agate stained by iron and found on the shores of Lake Superior.Its wide distribution and iron-rich bands of color reflect the gemstone's geologic history in Minnesota, Wisconsin, Nebraska, Iowa, Kansas, and Michigan.