Our grandson, Colton, has spent this weekend with us. We enjoy his visits very much. He sits here at the bench and plays with my desktop computer, and looks at the tools and gemstones. He actually helps me with some tasks when I am working at the bench making jewelry. He constantly expresses the desire to learn how to do it. This weekend, he wanted to learn how to cut stones (put that off to next visit as the lapidary machine is under a pile), and then he asked about the anvil. He told me it was heavy, then asked how to use it. So I told him about shaping metal with a hammer. He wanted to try, so I gave him a copper link for a future necklace, that needs some forming. He proceeded to work with hammer and anvil to flatten the round link.
Monday, May 26, 2014
Friday, May 16, 2014
The title Precious Beryl refers to all colors of beryl that are not emerald or aquamarine (previous blogs). Beryl is a high temperature and high pressure metamorphic mineral. The colors in precious beryl are caused by different impurities included in the chemical makeup of the crystal. All forms of precious beryl have the same basic properties:
Color: yellow, gold, yellow-green, pink, red and colorless
Streak Color: white (usually only rough is tested for streak)
Moh's hardness: 7 1/2 to 8
Fracture: conchoidal (like the bulls eye in glass when shot by a BB)
Refractive Index: 1.562 - 1.602
These forms are:
Illustration 1: Bixbite/Red Beryl
Bixbite (Red Beryl): probably the rarest gemstone, found in a rasberry red color, the mineral is Bixbite, the gemstone is usually called Red Beryl. Some gemologists include red beryl as being a sub-group of Morganite.
Golden Beryl: color varies from lemon to golden yellow; Heliodore is frequently included as a subgroup. Inclusions are rare.
Goshenite: named after a type locality in Goshen, MA (USA); this is the "white" / colorless variety of beryl. Goshenite can be used as a diamond simulant.
Morganite: also called pink beryl, this stone was named after financier J.P. Morgan.
Because of the large variety of color, precious beryl can be confused with other colored stones (all gemstones other than diamond are called colored stones). Some greenish beryls can be heated and will change in color to blue (aquamarine).
Posted by John Rasmussen at 4:27 PM