enow.com Web Search

Search results

1. Results from the WOW.Com Content Network

2. Tourmaline - Wikipedia

   en.wikipedia.org/wiki/Tourmaline

   Tri-chromatic elbaite crystals on quartz, Himalaya Mine, San Diego Co., California, US. Tourmaline is a six-member ring cyclosilicate having a trigonal crystal system. It occurs as long, slender to thick prismatic and columnar crystals that are usually triangular in cross-section, often with curved striated faces. The style of termination at ...

3. Gemstones of Pakistan - Wikipedia

   en.wikipedia.org/wiki/Gemstones_of_Pakistan

   The image shows striated anatase crystals (in black), brookite blade and quartz crystals covering a feldspar matrix from Kharan. [3] Chaman: Quartz Various types of quartz found are diamond, window, quartz on prehnite, and faden. Image shows translucent light sea-foam green prehnite with quartz crystals. [3] Taftan: Quartz and brookite

4. 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 ...

5. Mineral - Wikipedia

   en.wikipedia.org/wiki/Mineral

   The major examples of these are quartz, the feldspars, the micas, the amphiboles, the pyroxenes, the olivines, and calcite; except for the last one, all of these minerals are silicates. [39] Overall, around 150 minerals are considered particularly important, whether in terms of their abundance or aesthetic value in terms of collecting.

6. Pegmatite - Wikipedia

   en.wikipedia.org/wiki/Pegmatite

   Quartz crystals with masses measured in thousands of pounds [5] and micas over 10 meters (33 ft) across and 4 meters (13 ft) thick have been found. [8] Spodumene crystals over 12 meters (40 ft) long have been found in the Black Hills of South Dakota , and beryl crystals 8.2 meters (27 ft) long and 1.8 meters (6 ft) in diameter have been found ...

7. List of gemstones by species - Wikipedia

   en.wikipedia.org/wiki/List_of_gemstones_by_species

   Actinolite. Nephrite (var.); Adamite; Aegirine; Afghanite; Agrellite; Algodonite; Alunite; Amblygonite; Analcime; Anatase; Andalusite. Chiastolite; Andesine ...