For practising gemologists only. Neodymium pentaphosphate is a rare experimental synthetic material that shows reversible lamellar twinning under polarized light when gentle pressure is applied perpendicular to twinning planes. Take a look.
Useful link:
https://www.gia.edu/gems-gemology/spring-2020-microworld-reversible-twinning-ndp
P.J.Joseph's Weblog On Colored Stones, Diamonds, Gem Identification, Synthetics, Treatments, Imitations, Pearls, Organic Gems, Gem And Jewelry Enterprises, Gem Markets, Watches, Gem History, Books, Comics, Cryptocurrency, Designs, Films, Flowers, Wine, Tea, Coffee, Chocolate, Graphic Novels, New Business Models, Technology, Artificial Intelligence, Robotics, Energy, Education, Environment, Music, Art, Commodities, Travel, Photography, Antiques, Random Thoughts, and Things He Like.
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Showing posts with label John I. Koivula. Show all posts
Showing posts with label John I. Koivula. Show all posts
Saturday, August 15, 2020
Saturday, August 01, 2020
Unknown Inclusion In Triphane Spodumene
Raman microspectrometry wasn't able to identify the orange inclusion. This was because the crystal faces of the spodumene were etched, which interfered with the passage of the laser in spodumene. Take a look.
Useful link:
https://www.gia.edu/gems-gemology/spring-2020-microworld-unknown-inclusion-in-triphane-spodumene
Useful link:
https://www.gia.edu/gems-gemology/spring-2020-microworld-unknown-inclusion-in-triphane-spodumene
Wednesday, October 30, 2019
Wednesday, October 09, 2019
Lazurite In Spinel
Take a look.
Useful link:
https://www.gia.edu/gems-gemology/spring-2019-microworld-lazurite-in-spinel
Useful link:
https://www.gia.edu/gems-gemology/spring-2019-microworld-lazurite-in-spinel
Monday, September 30, 2019
Saturday, August 24, 2019
Inclusions In Natural, Treated, Synthetic, And Imitation Opal
Take a look at a wide range of interesting inclusions in opal.
Useful link:
https://www.gia.edu/gems-gemology/summer-2019-suggested-reading-opal-chart
Useful link:
https://www.gia.edu/gems-gemology/summer-2019-suggested-reading-opal-chart
Thursday, April 25, 2019
Quarterly Crystal: Bubble In Fluorite
Fluid inclusions are always a delight to observe.
Useful link:
https://www.gia.edu/gems-gemology/winter-2018-microworld-quarterly-crystal-bubble-in-fluorite
Useful link:
https://www.gia.edu/gems-gemology/winter-2018-microworld-quarterly-crystal-bubble-in-fluorite
Sunday, April 07, 2019
Chart: Inclusions In Natural, Synthetic, And Treated Diamond
A good reference chart from the GIA.
Useful link:
https://www.gia.edu/gems-gemology/winter-2018-inclusions-natural-synthetic-treated-diamond
Useful link:
https://www.gia.edu/gems-gemology/winter-2018-inclusions-natural-synthetic-treated-diamond
Thursday, February 21, 2019
Prismatic Rutile In Quartz
One of a kind gem inclusion.
Useful link:
https://www.gia.edu/gems-gemology/winter-2018-microworld-prismatic-rutile-in-quartz
Useful link:
https://www.gia.edu/gems-gemology/winter-2018-microworld-prismatic-rutile-in-quartz
Thursday, March 01, 2018
Inclusions In Natural, Synthetic, And Treated Ruby
A good comparison study.
Useful link:
https://www.gia.edu/gems-gemology/winter-2017-inclusions-natural-synthetic-ruby
Useful link:
https://www.gia.edu/gems-gemology/winter-2017-inclusions-natural-synthetic-ruby
Thursday, December 21, 2017
Barite In Fluorite
Crystal update.
Useful link:
https://www.gia.edu/gems-gemology/fall-2017-microworld-quarterly-crystal-barite-fluorite
Useful link:
https://www.gia.edu/gems-gemology/fall-2017-microworld-quarterly-crystal-barite-fluorite
Thursday, October 12, 2017
Monday, October 02, 2017
Saturday, September 30, 2017
Tuesday, August 15, 2017
Tuesday, May 02, 2017
Thursday, August 11, 2016
Friday, June 03, 2016
Sunday, April 03, 2016
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