Gold Sheen Obsidian
SpiritRock Shop
Museum Specimens

“The various colors of obsidian are a result of several factors. Clear varieties of obsidian contain very few opaque
impurities or microscopic mineral crystals. Red or brown obsidian generally results from tiny crystals or inclusions
of hematite or limonite (iron oxide). Abundant, microscopic crystals of minerals like magnetite, hornblende,
pyroxene, plagioclase and biotite, combined with tiny fragments of rock, likely produce the jet-black varieties of
obsidian. Microscopic crystals of various types of feldspars may yield the unique blue, green, purple or bronze
colors associated with rainbow obsidian. The reflectance of rainbow obsidian is likely attributed to a preferred
orientation of microscopic crystals of feldspar or mica oriented along flow layers.
A certain amount of water always is present in obsidian. Very small inclusions of water vapor in the form of
bubbles often are trapped in the glass. Tiny gas bubbles that have been stretched nearly flat along the flow layers
in obsidian generally cause the reflectance of gold sheen and silver sheen obsidian. Some of these bubbles are
visible to the naked eye. The bubbles can be seen readily with a strong magnifying glass or a microscope.
Obsidian is relatively unstable from a geologic perspective. It is rare to find obsidian older than about 20 million
years, which is very young in comparison to most continental rocks that form the Earth's crust. Over a long period
of time, obsidian gradually changes from glass to rock in a process known as "devitrification." In this process, the
silica molecules within the glass slowly rearrange into organized crystal patterns. The "snowflakes" in snowflake
obsidian are quartz crystals that have formed through devitrification of the original obsidian. The crystals that
develop through devitrification cause obsidian to lose its conchoidal fracture and glassy texture.”

information source courtesy of...http://volcano.oregonstate.edu/obsidian
Item # OBGS03160340
Gold Sheen Obsidian Rough

$10.00
Gold Sheen Obsidian Rough from Utah (photographed dry in its natural state)
This specimen weighs 4.8oz or 0.3 pounds ( 138g ) and measures 2.8 x 2.3 x 1.1 inches (72 x 60 x 29mm)
This piece has good sheen! (sheen seen at correct viewing angle determines cutting or polishing angles)
Click on any photo to see a larger version
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Obsidian is relatively soft with a typical hardness rating of 5 to 5.5.  Obsidian, unlike crystals, has no regular
structure and therefore fractures in smooth conchoidal (curved) shapes. Quality Gold Sheen Obsidian is in high
demand for making jewelery. Photos above we took of specimens we procured in South Western Utah during our
2012 rock finding trip to Utah.

The Nevada, Utah and California area, referred to as the Great Basin, is an ideal location to find
Obsidian. There are a myriad of colors, patterns and mixes of Obsidians, making them a very
desirable collector item.
Below are some pieces from our 2012 trips to Utah. (Photos of rough shown dry)

Nice Gold Sheen Obsidian is getting hard to find.....
It is from the Black Rock Desert in western Utah where it was geologically deposited
approximately 2.5 million years ago (the late Tertiary Period), during volcanic eruptions in the
Black Spring area of the Black Rock Desert area in western Utah.
Item # OBGS1012G8
Gold Sheen Obsidian Rough
Gold Sheen Obsidian Rough from Utah (photographed dry in its natural state)
This specimen weighs 13.7oz or 0.86 pounds (390g ) and measures 3.2 x 3.1 x 2 inches (8.3 x 8 x 5.1cm)
This piece has good sheen! (sheen seen at correct viewing angle determines cutting or polishing angles)
Item # OBGS03160440
Gold Sheen Obsidian Rough

$12.00
Item # OBGS1012G10
Gold Sheen Obsidian Rough
Gold Sheen Obsidian Rough from Utah (photographed dry in its natural state)
This specimen weighs 10.3oz or 0.64 pounds (292g ) and measures 3.3 x 3 x 1.8 inches (8.5 x 7.6 x 4.6cm)
This piece has good sheen! (sheen seen at correct viewing angle determines cutting or polishing angles)
Item # OBGS1012G11
Gold Sheen Obsidian Rough
Gold Sheen Obsidian Rough from Utah (photographed dry in its natural state)
This specimen weighs 8.1oz or 0.5 pounds (230g ) and measures 3.8 x 2.2 x 1.8 inches (9.8 x 5.8 x 4.6cm)
This piece has good sheen! (sheen seen at correct viewing angle determines cutting or polishing angles)
Gold Sheen Obsidian Rough from Utah (photographed dry in its natural state)
This specimen weighs 7.8oz or 0.49 pounds (223g ) and measures 2.8 x 2 x 1.97 inches (72 x 53 x 50mm)
This piece has good sheen! (sheen seen at correct viewing angle determines cutting or polishing angles)
Item # OBGS1012G12
Gold Sheen Obsidian Rough
Gold Sheen Obsidian Rough from Utah (photographed dry in its natural state)
This specimen weighs 4.8oz or 0.3 pounds (138g ) and measures 3 x 2 x 1.1 inches (7.3 x 5.1 x 3.0cm)
This piece has good sheen! (sheen seen at correct viewing angle determines cutting or polishing angles)
Item # OBGS1012G13
Gold Sheen Obsidian Rough
Item # OBGS03160540
Gold Sheen Obsidian Rough

$11.00
Gold Sheen Obsidian Rough from Utah (photographed dry in its natural state)
This specimen weighs 5.9oz or 0.37 pounds (169g ) and measures 2.3 x 1.9 x 1.8 inches (60 x 48 x 46mm)
This piece has good sheen! (sheen seen at correct viewing angle determines cutting or polishing angles)
Item # OBGS1012G15
Gold Sheen Obsidian Rough
Gold Sheen Obsidian Rough from Utah (photographed dry in its natural state)
This specimen weighs 17.1oz or 1.07 pounds (486g ) and measures 4.7 x 2.8 x 2.1 inches (12 x 7.3 x 5.4cm)
This piece has good sheen! (sheen seen at correct viewing angle determines cutting or polishing angles)
The above listings are the last of our specimens
from our 2012 trip to Utah
Gold Sheen Obsidian Rough from Utah (photographed dry in its natural state)
This specimen weighs 5.4oz or 0.34 pounds (154g ) and measures 2.7 x 2.1 x 1.6 inches (6.9 x 5.5 x 4.1cm)
This piece has good sheen! (sheen seen at correct viewing angle determines cutting or polishing angles)
Item # OBGS03161271
XXL Grade AA Gold
Sheen Obsidian Rough

$95.00
XXL Grade AA Gold Sheen Obsidian Rough
(photographed dry in its natural state)
This specimen weighs 4lb 15.5oz or 4.87 pounds (2250g ) and
measures 6.7 x 5.9 x 2.8 inches (17 x 15.1 x 7.1cm)
This piece has outstanding sheen and impressive multi angle
viewing
! (sheen seen at correct viewing angle determines
cutting or polishing angles) This is one of the strongest gold
sheens we have run across. We procured it from a dealer in
Tennessee, it is from Mexico
Item # OBGS01132550
Tri-Flow with Gold
Sheen Mix Obsidian
Rough

$46.00
Tri-Flow with Gold Sheen Mix Obsidian Rough
(photographed dry in its natural state)
This specimen weighs 29.4oz or 1.84 pounds (836g ) and measures 4.4 x 3.7 x 2.8 inches (11.1 x 9.5 x 7.2cm)
This amazing piece of Obsidian from Glass Butte in the high desert area of Central Oregon has a
basic Tri-Flow configuration with Black, Mahogany and Clear obsidian coloration but adds an extra
kick with Paintbrush Stroke looking Gold Sheen in the mix! This one should be Very Interesting to cut
or work. Lots of material for various work cutting or cabbing or knapping or...just  keep it as a natural
specimen.
What does
Tri-Flow
Obsidian look
like and how do
you tell if it is
Tri-Flow?

This is a photo I took today of a thin sliver of Tri-Flow Obsidian. The Black, Mahogany and
Clear layers are very easy to see in almost any type of light. These photos were taken
outdoors in natural sunlight. The clear layers show the green grass color.

The best way to determine if it is a Tri-Flow is to break off a small piece and hold it up to
the light to look for the clear layers. After being around obsidian for a while you will be
able to just look at the natural specimen and see the "extra depth" of color created by the
additional clear obsidian, much like a layer of clear coat paint on a car.
Be very Careful handling Obsidian. It is one of the sharpest known
glass like substances in the world!