Rainbow Obsidian: Iridescent Obsidian
What Causes the Color of Rainbow Obsidian
The color of rainbow obsidian is caused by the presence of tiny inclusions of magnetite, which refract light in different directions. These inclusions are typically less than 0.01 millimeter in size and are arranged in a regular pattern. When light hits the inclusions, it is scattered in all directions, creating the iridescent sheen that is characteristic of rainbow obsidian.
The iridescence of rainbow obsidian is a result of a phenomenon called thin-film interference. Thin-film interference is a phenomenon that occurs when light passes through a thin layer of material. The light waves are reflected off of the top and bottom surfaces of the layer, and the waves interfere with each other. This interference can produce a variety of colors, depending on the thickness of the layer and the wavelength of the light.
In the case of rainbow obsidian, the thin layers are created by the magnetite inclusions. The magnetite inclusions are less dense than the surrounding glass, so they cause the light to bend as it passes through them. This bending creates the thin layers that are responsible for the iridescence.
Rainbow Obsidian
Velvet rainbow obsidian from the Cenozoic of Mexico.
Photo: James St. John
Where is Rainbow Obsidian found
Here are some specific places where you might encounter this mesmerizing gem:
California:
While there are a few scattered deposits around the world, the vast majority of rainbow obsidian is found in the Warner Mountains of northeastern California, USA. More specifically, it's concentrated in the Modoc National Forest, near the Oregon border. Within this region, there are four main mines known for their rainbow obsidian:
Pink Lady Mine: This mine is famous for its pink obsidian, but it also produces some beautiful rainbow specimens.
Lassen Creek Rainbow Mine: As the name suggests, this mine is known for its high-quality rainbow obsidian with vibrant colors.
Needles Mine: This mine is unique for its deposits of elongated obsidian needles, some of which exhibit the rainbow effect.
Middle Fork Davis Creek Mine: This mine offers a variety of obsidian, including rainbow obsidian with multiple color flashes.
Mexico: Several areas in Mexico, particularly Chihuahua and Jalisco, are known for producing high-quality rainbow obsidian. Local markets and artisans often offer unique pieces, but be cautious about authenticity and ethical sourcing practices.
Guatemala: Certain regions in Guatemala, like Lake Atitlán, are known for their rainbow obsidian deposits. Indigenous communities often craft beautiful jewelry and carvings from this stone, offering a chance to connect with local culture and support artisanal practices.
Armenia: The Garni Gorge in Armenia is another source of rainbow obsidian, with some shops and artisans in the area offering unique pieces. Research responsible sourcing practices and ensure you're buying from reputable vendors.
Iceland: While less common, rainbow obsidian can also be found in certain parts of Iceland, particularly in volcanic regions. Visiting specialized shops or connecting with local gem enthusiasts might lead you to this rare treasure.
Rainbow Obsidian FAQs
Is Rainbow Obsidian expensive
The price of Rainbow Obsidian can vary significantly depending on its quality, size, and color intensity. High-quality stones with vivid colors and large sizes can fetch higher prices. However, compared to other precious gemstones, Rainbow Obsidian is generally considered relatively affordable.
Is rainbow obsidian real or fake
Rainbow obsidian is a naturally occurring variety of obsidian. While some stones might be treated to enhance their color, genuine rainbow obsidian exhibits its iridescent sheen due to its inherent mineral composition and structure.
Rainbow Obsidian
Rainbow Obsidian, from Davis Creek, California
How can you tell if rainbow obsidian is real
The most reliable way to authenticate rainbow obsidian is through gemological testing. However, some visual clues can also be helpful. Genuine rainbow obsidian will typically display:
Natural color variation: The colors appear organic and blend smoothly, not uniform or concentrated in specific areas.
Surface texture: The stone should be smooth and glassy, not overly polished or treated with artificial coatings.
Depth of color: The iridescent sheen should appear to come from within the stone, not just a surface layer.
The color of rainbow obsidian is caused by the presence of tiny inclusions of magnetite, which refract light in different directions. These inclusions are typically less than 0.01 millimeter in size and are arranged in a regular pattern. When light hits the inclusions, it is scattered in all directions, creating the iridescent sheen that is characteristic of rainbow obsidian.
The iridescence of rainbow obsidian is a result of a phenomenon called thin-film interference. Thin-film interference is a phenomenon that occurs when light passes through a thin layer of material. The light waves are reflected off of the top and bottom surfaces of the layer, and the waves interfere with each other. This interference can produce a variety of colors, depending on the thickness of the layer and the wavelength of the light.
In the case of rainbow obsidian, the thin layers are created by the magnetite inclusions. The magnetite inclusions are less dense than the surrounding glass, so they cause the light to bend as it passes through them. This bending creates the thin layers that are responsible for the iridescence.
Rainbow Obsidian
Velvet rainbow obsidian from the Cenozoic of Mexico.
Photo: James St. John
Where is Rainbow Obsidian found
Here are some specific places where you might encounter this mesmerizing gem:
California:
While there are a few scattered deposits around the world, the vast majority of rainbow obsidian is found in the Warner Mountains of northeastern California, USA. More specifically, it's concentrated in the Modoc National Forest, near the Oregon border. Within this region, there are four main mines known for their rainbow obsidian:
Pink Lady Mine: This mine is famous for its pink obsidian, but it also produces some beautiful rainbow specimens.
Lassen Creek Rainbow Mine: As the name suggests, this mine is known for its high-quality rainbow obsidian with vibrant colors.
Needles Mine: This mine is unique for its deposits of elongated obsidian needles, some of which exhibit the rainbow effect.
Middle Fork Davis Creek Mine: This mine offers a variety of obsidian, including rainbow obsidian with multiple color flashes.
Mexico: Several areas in Mexico, particularly Chihuahua and Jalisco, are known for producing high-quality rainbow obsidian. Local markets and artisans often offer unique pieces, but be cautious about authenticity and ethical sourcing practices.
Guatemala: Certain regions in Guatemala, like Lake Atitlán, are known for their rainbow obsidian deposits. Indigenous communities often craft beautiful jewelry and carvings from this stone, offering a chance to connect with local culture and support artisanal practices.
Armenia: The Garni Gorge in Armenia is another source of rainbow obsidian, with some shops and artisans in the area offering unique pieces. Research responsible sourcing practices and ensure you're buying from reputable vendors.
Iceland: While less common, rainbow obsidian can also be found in certain parts of Iceland, particularly in volcanic regions. Visiting specialized shops or connecting with local gem enthusiasts might lead you to this rare treasure.
Rainbow Obsidian FAQs
Is Rainbow Obsidian expensive
The price of Rainbow Obsidian can vary significantly depending on its quality, size, and color intensity. High-quality stones with vivid colors and large sizes can fetch higher prices. However, compared to other precious gemstones, Rainbow Obsidian is generally considered relatively affordable.
Is rainbow obsidian real or fake
Rainbow obsidian is a naturally occurring variety of obsidian. While some stones might be treated to enhance their color, genuine rainbow obsidian exhibits its iridescent sheen due to its inherent mineral composition and structure.
Rainbow Obsidian
Rainbow Obsidian, from Davis Creek, California
How can you tell if rainbow obsidian is real
The most reliable way to authenticate rainbow obsidian is through gemological testing. However, some visual clues can also be helpful. Genuine rainbow obsidian will typically display:
Natural color variation: The colors appear organic and blend smoothly, not uniform or concentrated in specific areas.
Surface texture: The stone should be smooth and glassy, not overly polished or treated with artificial coatings.
Depth of color: The iridescent sheen should appear to come from within the stone, not just a surface layer.
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07 September 2024
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