Tumbled eye agate: Some pieces of agate display concentric circles known as "eyes." These round markings are actually small hemispheres within the outer husk of the agate nodule. Most pieces of agate do not have "eyes," so stones that do have them are especially prized by collectors. ...
Agate, Maybe Not. The name "grape agate" has stuck as a marketing term. However, the name is a misnomer. Misnomers are names that are scientifically incorrect. There are no arguments with "grape" because of its purple color. But, the use of "agate" as a species/variety name draws ...
The chemical properties of an element or substance are determined when it is transformed through a chemical reaction to a new state. The chemical properties of an element describe how it reacts when it comes into contact with other substances. For example, the alkali metals all react violently ...
What are the borate minerals?Boron:Boron is a chemical element that has the atomic number 5. It is described as a metalloid because its properties fall between those of metals and nonmetals. It was discovered in 1808 by Louis-Josef Gay-Lussac and Louis-Jacques Thenard....
What are the piezoelectric properties of quartz? The piezoelectric properties of quartz refer to its ability to generate an electrical charge in response to applied mechanical stress. 3 What is the difference in hardness between alabaster and quartz? Quartz is significantly harder than alabaster, makin...
Aventurine: Colors, Properties, Benefits, Uses What is a Herkimer Diamond? As the hot water cools and pressure changes within the cavity, layers of chalcedony and other minerals start to deposit. These layers build up, forming the core of the "stalactite" - the agate. ...
Birthstone Meanings and Stone Properties by Month When each of us is born, elements throughout the universe are aligned in uniquely specific formations. Because every aspect of creation is connected, our birth stars and planets are positioned in ways that are meant to impact our lives, both posi...
When making a piece of jewellery, there a several criteria which can define ‘good’. These are not only the aesthetics of the finished piece but also the impact of earlier actions on subsequent ones. This suggests that the manner in which an action is coordinated is influenced by the ...
At the melting point not only the aggregate state changes; quite a lot of other physical characteristics also change significantly. Amongst these are the thermodynamic values, specific heat capacity, enthalpy, and rheological properties such as volume or viscosity. Last but not le...
The name "tanzanite" was given because the world's only known tanzanite deposit of commercial importance is in northern Tanzania. The name reflects the gem’s limited geographic origin. The mines are all located in an area of about eight square miles in the Merelani Hills, near the base of...