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Healing Crystals and stones: Types of Crystals and stones:
Diamonds: types of diamonds are distinguished physically by their characteristics. The three categories are crystal, the carbon, and the anthracitic diamond. What distinguishes them is the specific gravity of diamond which is 5.53. Carbons specific gravity ranges from 3.01 to 3.40, and anthracitic diamond is merely 1.66 specific gravity. At lower levels, diamonds show impurities in the stone as compared to crystals, however, chemically share the hardness as a pure diamond. The carbon diamond is put use in practical settings because it is low in price and high in hardness. Also, the carbon diamond is not colorless and appears in black or grey translucent forms in thin slabs. in regards to chemical, the diamond is carbon.
Amethyst: The visual properties and paramagnetic resonance is a result of abstract centers of color inside of the crystal that is a result of reacting to ionizing radiation on previous centers that surface from the transference of Fe+3 for Si+3 in the a-quartz structure. it is these conditions that make part of the electron paramagnetic resonance spectrum of an amethyst crystal. The amethyst is equally occupied by Si+3 and unequally occupied by Fe+3, a characteristic that gives the answer to the crystals optical biaxiality.[1]
Opal: Is not a crystalline structure but rather it is an amorphous form of silica. Threes significant attributes make of the typical appearance of opals, first, its color is is linked to flakes throughout each opal that are uniform in size and vary in length. Second, is how the opal changes in the light as it is rotated with respect to the eyes viewing it. The third important feature of opals is the validity of spectrally pure colors that are seen.[2]. Opals were understood by the power of electron microscopes and it was discovered that they are riddled with equal geometric patterns of small holes throughout the surface. From one surface to another the shapes and patterns vary between one opal grain to another, every fracture surface has them. Regular arrays of holes in the body of opals play a role in the three-dimensional diffraction gratings, giving it the characteristic of a fire stone.
- ^ {{cite journal |last1=Barry |first1=T.I. |last2=Moore |first2=W.J. |title=Amethyst: Optical Properties and Paramagnetic Resonance |journal=American Association for the Advancement of Science |date=Apr. 17 1964 |volume=144 |issue=3616 |page=289-290 |url=www.jstor.org/stable/1713340. |
- ^ {{cite journal |last1=Darragh |first1=P.J. |title=Opals |journal=Scientific American |date=1976 |volume=234 |issue=4 |page=84-95 |url=www.jstor.org/stable/24950330.|