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  2. 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

  3. 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 ...

  4. 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 ...

  5. List of minerals by optical properties - Wikipedia

    en.wikipedia.org/wiki/List_of_minerals_by...

    Optical properties of common minerals Name Crystal system Indicatrix Optical sign Birefringence Color in plain polars Anorthite: Triclinic: Biaxial (-) 0.013

  6. List of minerals of Pakistan - Wikipedia

    en.wikipedia.org/wiki/List_of_minerals_of_Pakistan

    Topaz on matrix from Dassu in Gilgit Baltistan Brookite and Quartz mineral from Balochistan. Gemstones, also known as semi-precious stones or gems, are minerals widely used in jewelry and for ornamental purposes. Northern and western regions of Pakistan are rich in high quality gemstones. Some of the major gemstones are enlisted below; [4] Peridot

  7. Elbaite - Wikipedia

    en.wikipedia.org/wiki/Elbaite

    Elbaite is allochromatic, meaning trace amounts of impurities can tint crystals, and it can be strongly pleochroic. Every color of the rainbow may be represented by elbaite, some exhibiting multicolor zonation. Microscopic acicular inclusions in some elbaite crystals show the cat's eye effect in polished cabochons.

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