Search results
Results from the WOW.Com Content Network
Green quartz is sometimes called green amethyst; the scientific name is prasiolite. [9] Other names for green quartz are vermarine and lime citrine. Amethyst frequently shows color zoning, with the most intense color typically found at the crystal terminations. One of gem cutters' tasks is to make a finished product with even color. Sometimes ...
Colorless beryls, also called goshenite, become pure yellow when irradiated, which are called golden beryl or heliodor. [1] Quartz crystals turn "smoky" or light gray upon irradiation if they contain an aluminum impurity, or amethyst if small amounts of iron are present in them; either of the results can be obtained from natural radiation as well.
Herkimer diamonds are double-terminated quartz crystals discovered within exposed outcrops of dolomite in and around Herkimer County, New York, and the Mohawk River Valley in the US. [ 1 ] [ 2 ] They are not diamonds ; the "diamond" in their name is due to both their clarity and well-formed faces.
Prasiolite (also known as green quartz, green amethyst or vermarine) is a green variety of quartz. Since 1950, almost all natural prasiolite has come from a small Brazilian mine, [citation needed] but it has also been mined in the Lower Silesia region of Poland. Naturally occurring prasiolite has also been found in the Thunder Bay area of ...
Liesegang rings (/ ˈ l iː z ə ɡ ɑː ŋ /) (also called Liesegangen rings or Liesegang bands) are colored bands of cement observed in sedimentary rocks that typically cut across bedding. [ 1 ] [ 2 ] These secondary ( diagenetic ) sedimentary structures exhibit bands of ( authigenic ) minerals that are arranged in a regular repeating pattern ...
[9] [10] They are a form of breccia, which is a textural term for any rock composed of angular fragments. [10] [11] Eye agates have one or more circular, concentric rings on their surface. [12] These "eyes" are actually hemispheres that form on the husk of the agate and extend inward like a bowl.
Lonsdaleite (named in honour of Kathleen Lonsdale), also called hexagonal diamond in reference to the crystal structure, is an allotrope of carbon with a hexagonal lattice, as opposed to the cubical lattice of conventional diamond.
Qasem Soleimani wearing an aqeeq ring. An aqeeq ring also has religious importance in Islam as it is considered sunnah to wear one. Muhammad wore a carnelian / aqiq ring set with silver as a commemoration of the removal of idols from the Grand Mosque in Mecca in 630 CE. Many Muslims do the same, including both Shia and Sunni clergy. [1]