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May 7, 2017 Weekly Geology Guest, Opal

May 6, 2017
Greetings from the Bluff Park Back Porch, way up yonder on Shades Mountain (1,109′) in Alabama:
We will start Segment 1 with Gems (Diamonds, Emeralds, Rubies, Opal, and Jade).  For this week we will look at OPAL.  A riotous rainbow of colors.
Opal Gemstone Pendant.  Smithsonian
 
NOVA, Treasures of the Earth
1.    NOVA, Treasures of the Earth, Gems.

2.    NOVA, Treasures of the Earth, Metals.

http://www.pbs.org/video/2365886855/

3.    NOVA, Treasures of the Earth, Power (Fossil Fuels).

http://www.pbs.org/video/2365892300/

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OPAL
“Opal is a hydrated amorphous form of silica (SiO2·nH2O); its water content may range from 3 to 21% by weight.  It is deposited at a relatively low temperature and may occur in the fissures of almost any kind of rock.
The internal structure of precious opal makes it diffract light. Depending on the conditions in which it formed, it can take on many colors. Precious opal ranges from clear through white, gray, red, orange, yellow, green, blue, magenta, rose, pink, slate, olive, brown, and black. Of these hues, the black opals are the most rare, whereas white and greens are the most common. Opals vary in optical density from opaque to semitransparent.”

Opal.  Virgin Valley, Nevada. 2007.  by Chris Ralph of Nevada-outback-gems.com
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>    Search:  NOVA, Treasures of the Earth, opal.
References include:
–    Wikipedia
–    PBS, NOVA > Treasures of the Earth.
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Editors Note:  It is the intent of this site to keep this discussion as simple as possible, so as to educate the interested general public and not to discuss with the geology crowd the latest geologic theories and nuances.  Thanks, R
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“No copyright infringement intended.
The rights belong to their respective owners”

Copyright Disclaimer: Under Section 107 of the Copyright Act 1976, allowance is made for “fair use” for purposes such as criticism, comment, news reporting, teaching, scholarship, and research. Fair use is a use permitted by copyright statute that might otherwise be infringing. Non-profit, educational or personal use tips the balance in favor of fair use.

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Author’s Request:  If you see any pictures that you know the source and photographer, let me know immediately.  Thanks!  R

Images have been searched by TinEye Reverse Image Search.  http://tineye.com/
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Next week I will venture into another green mineral, JADE.
 
Enjoy the adventure!
 
Thanks,

 

R
1. Opal, Fire. Nova Gems

1. Opal, Fire. Nova Gems

2. Opalized Ammonite Fossil. by Mihai Andrei .

2. Opalized Ammonite Fossil. by Mihai Andrei .

3. Opal - Limb Cast. Wollo Province, Ethiopia. LGF Foundation

3. Opal – Limb Cast. Wollo Province, Ethiopia. LGF Foundation

4. Opal replacement of Belemnite fossi. Australia. www.irocks.com

4. Opal replacement of Belemnite fossi. Australia. http://www.irocks.com

5. Wood Opal-yellow, 20-cm.. Clover Ck., Lincoln Co., ID. by unknown

5. Wood Opal-yellow, 20-cm.. Clover Ck., Lincoln Co., ID. by unknown

1. Opals-Australian. by Paul Oglesby

1. Opals-Australian. by Paul Oglesby

2. Opal. Australia. Natiional Museum of Natural History. by Emily Curewitz

2. Opal. Australia. Natiional Museum of Natural History. by Emily Curewitz

3. Opal, 11.02ct. Opal Abysinnia. by unknown

3. Opal, 11.02ct. Opal Abysinnia. by unknown

4. Opal, Black, 16.42cts. Lightning Ridge, NSW, Australia. by Daniel Mekis

4. Opal, Black, 16.42cts. Lightning Ridge, NSW, Australia. by Daniel Mekis

5. Opal, Rainbow Shield Mintabie Pendant. 25.61c. Mintabie, S. Australia. by Dpulitzer

5. Opal, Rainbow Shield Mintabie Pendant. 25.61c. Mintabie, S. Australia. by Dpulitzer

6. Opal, Ethiopian Welo, Jupiter, 20c. Opal_and_Diamond_Pendant. 2015. Doxymo

6. Opal, Ethiopian Welo, Jupiter, 20c. Opal_and_Diamond_Pendant. 2015. Doxymo

7. Opal. Sebastian Zylkowski

7. Opal. Sebastian Zylkowski

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