Friday, December 27, 2013

Gemstone of the Week: Fire Obsidian

(Image of Fire Obsidian found on topgems.homestead.com
More images of Fire Obsidian





Fire Obsidian is very like the Rainbow Obsidian I blogged about last time. Just like Rainbow Obsidian, Fire Obsidian's interesting iridescence (or 'fire' as it is also called) is caused by the presence of Magnetite microcrystals. In Fire Obsidian, these microcrystals are in thin layers, which are roughly the thickness of the wavelength of light, whereas, in Rainbow Obsidian the layers of Magnetite microcrystals are in thicker volume and so gives the Obsidian larger bands of colour.  Fire Obsidian is only known to be found in Lake County, Oregon.

Tuesday, December 17, 2013

Gemstone of the Week: Rainbow Obsidian

(Image of rainbow obsidian found on gemrockauctions.com)

Rainbow Obsidian is another of the unusual varieties of Obsidian and is a such a gorgeous stone. The stunning multicoloured iridescence of this gem is caused by the presences of Magnetite nanoparticle inclusions. Rainbow Obsidian is found in very few locations. It may be found in Jalisca, Mexico; Modoc co. California, and  Lake Co. Oregon. Rainbow Obsidian is also known as iris Obsidian. Like most Obsidian, Rainbow Obsidian tends to be fairly inexpensive.

Tuesday, December 10, 2013

Barrelweave (Bracelet)(Sterling Silver/Lime Green/Purple)




("Barrelweave (Bracelet)" by Handmaden Designs LLC)

Sterling silver and enameled copper Barrelweave chainmaille bracelet.  Measures at just over 7.5 inches long and approximately 1/4 inch wide.

Monday, December 9, 2013

Gemstone of the Week: Gold Sheen/Silver Sheen Obsidian

(Image of (carved) Gold Sheen Obsidian found on popscreen.com)

(Image of Silver Sheen Obsidian found on YMCompanyGemstones on Etsy)

Gold Sheen and Silver Sheen Obsidian are two others of the lesser known, yet very interesting varieties of Obsidian. The shimmery affect that both Sheen Obsidians have is caused by the presence of trapped gas bubbles inside of the volcanic glass that were then stretched along the flow line of the Obsidian.