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2. Chalcedony - Wikipedia

   en.wikipedia.org/wiki/Chalcedony

   Chrysoprase (also spelled chrysophrase) is a green variety of chalcedony, which has been colored by nickel oxide. (The darker varieties of chrysoprase are also referred to as prase. However, the term prase is also used to describe green quartz and to a certain extent is a color-descriptor, rather than a rigorously defined mineral variety.)

3. Category:Quartz varieties - Wikipedia

   en.wikipedia.org/wiki/Category:Quartz_varieties

   Varieties of the mineral Quartz. Subcategories. This category has the following 2 subcategories, out of 2 total. C. Chert (3 C, 23 P) Q. Quartz gemstones (2 C, 18 P)

4. Quartz - Wikipedia

   en.wikipedia.org/wiki/Quartz

   Since antiquity, varieties of quartz have been the most commonly used minerals in the making of jewelry and hardstone carvings, especially in Europe and Asia. Quartz is the mineral defining the value of 7 on the Mohs scale of hardness, a qualitative scratch method for determining the hardness of a material to abrasion.

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6. List of minerals - Wikipedia

   en.wikipedia.org/wiki/List_of_minerals

   Amethyst crystals – a purple quartz Apophyllite crystals sitting right beside a cluster of peachy bowtie stilbite Aquamarine variety of beryl with tourmaline on orthoclase Arsenopyrite from Hidalgo del Parral, Chihuahua, Mexico Aurichalcite needles spraying out within a protected pocket lined by bladed calcite crystals Austinite from the Ojuela Mine, Mapimí, Durango, Mexico Ametrine ...

7. Category:Quartz - Wikipedia

   en.wikipedia.org/wiki/Category:Quartz

   Quartz varieties (2 C, 10 P) Pages in category "Quartz" The following 6 pages are in this category, out of 6 total. This list may not reflect recent changes. ...

8. Smoky quartz - Wikipedia

   en.wikipedia.org/wiki/Smoky_quartz

   Smoky quartz is a brownish grey, translucent variety of quartz that ranges in clarity from almost complete transparency to an almost-opaque brownish-gray or black crystals. [6] The color of smoky quartz is produced when natural radiation, emitted from the surrounding rock, activates color centers around aluminum impurities within the ...

9. Category:Quartz gemstones - Wikipedia

   en.wikipedia.org/wiki/Category:Quartz_gemstones

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