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  2. List of gemstones by species - Wikipedia

    en.wikipedia.org/wiki/List_of_gemstones_by_species

    Download as PDF; Printable version; ... There are over 300 types of minerals that have been used as gemstones. Such as: ... Metal-coated crystals hyped as rainbow ...

  3. Quartz - Wikipedia

    en.wikipedia.org/wiki/Quartz

    Quartz crystal demonstrating transparency. Pure quartz, traditionally called rock crystal or clear quartz, is colorless and transparent or translucent and has often been used for hardstone carvings, such as the Lothair Crystal. Common colored varieties include citrine, rose quartz, amethyst, smoky quartz, milky quartz, and others. [33]

  4. Quartzite - Wikipedia

    en.wikipedia.org/wiki/Quartzite

    Quartzite is a very hard rock composed predominantly of an interlocking mosaic of quartz crystals. The grainy, sandpaper-like surface is glassy in appearance. Minor amounts of former cementing materials, iron oxide, silica, carbonate and clay, often migrate during recrystallization, causing streaks and lenses to form within the quartzite. [1]

  5. Gemstone - Wikipedia

    en.wikipedia.org/wiki/Gemstone

    Many gems are crystals which are classified by their crystal system such as cubic or trigonal or monoclinic. Another term used is habit, the form the gem is usually found in. [12] For example, diamonds, which have a cubic crystal system, are often found as octahedrons. [13] Gemstones are classified into different groups, species, and varieties.

  6. Hexagonal crystal family - Wikipedia

    en.wikipedia.org/wiki/Hexagonal_crystal_family

    In particular, there are crystals that have trigonal symmetry but belong to the hexagonal lattice (such as α-quartz). The hexagonal crystal family consists of the 12 point groups such that at least one of their space groups has the hexagonal lattice as underlying lattice, and is the union of the hexagonal crystal system and the trigonal ...

  7. Crystal habit - Wikipedia

    en.wikipedia.org/wiki/Crystal_habit

    In mineralogy, crystal habit is the characteristic external shape of an individual crystal or aggregate of crystals. The habit of a crystal is dependent on its crystallographic form and growth conditions, which generally creates irregularities due to limited space in the crystallizing medium (commonly in rocks ).

  8. Jasper - Wikipedia

    en.wikipedia.org/wiki/Jasper

    Jasper, an aggregate of microgranular quartz and/or cryptocrystalline chalcedony and other mineral phases, [1] [2] is an opaque, [3] impure variety of silica, usually red, yellow, brown or green in color; and rarely blue.

  9. Gemstones of Pakistan - Wikipedia

    en.wikipedia.org/wiki/Gemstones_of_Pakistan

    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: The image shows a large specimen of quartz crystals on brookite from Taftan. Chagai: Malachite, azurite, garnet, zircon, obsidian, lapis lazuli, and ...

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