enow.com Web Search

Search results

1. Results from the WOW.Com Content Network

2. Rutilated quartz - Wikipedia

   en.wikipedia.org/wiki/Rutilated_quartz

   Rutilated quartz used as a gemstone. Rutilated quartz is a variety of quartz which contains acicular (needle-like) inclusions of rutile. [1] It is used for gemstones. These inclusions mostly look golden, but they also can appear silver, copper red or black.

3. Rutile - Wikipedia

   en.wikipedia.org/wiki/Rutile

   Rutile is an oxide mineral composed of titanium dioxide (TiO 2), the most common natural form of TiO 2. Rarer polymorphs of TiO 2 are known, including anatase, akaogiite, and brookite. Rutile has one of the highest refractive indices at visible wavelengths of any known crystal and also exhibits a particularly large birefringence and high ...

4. 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

5. Asterism (gemology) - Wikipedia

   en.wikipedia.org/wiki/Asterism_(gemology)

   Rutile causes the relative bright relief of a star in a host material such as corundum, which has a refractive index between 1.760 and 1.778, much lower than that of rutile. The stars are caused by the light reflecting from needle-like inclusions of rutile aligned perpendicularly to the rays of the star.

6. Portal:Minerals - Wikipedia

   en.wikipedia.org/wiki/Portal:Minerals

   Rutile is an oxide mineral composed of titanium dioxide (TiO 2), the most common natural form of TiO 2. Rarer polymorphs of TiO 2 are known, including anatase , akaogiite , and brookite . Rutile has one of the highest refractive indices at visible wavelengths of any known crystal and also exhibits a particularly large birefringence and high ...

7. 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.

8. Crystal healing - Wikipedia

   en.wikipedia.org/wiki/Crystal_healing

   Crystal healing is a pseudoscientific alternative-medicine practice that uses semiprecious stones and crystals such as quartz, agate, amethyst or opal. Despite the common use of the term "crystal", many popular stones used in crystal healing, such as obsidian, are not technically crystals. Adherents of the practice claim that these have healing ...

9. Acicular (crystal habit) - Wikipedia

   en.wikipedia.org/wiki/Acicular_(crystal_habit)

   Minerals with an acicular habit include mesolite, natrolite, [2] malachite, gypsum, rutile, brochantite and bultfonteinite. Crystals of dimethyltryptamine have an acicular habit, [3] but this substance is not regarded as a mineral by the International Mineralogical Association. A acicular phase of steel is bainite.