Showing posts with label John I. Koivula. Show all posts
Showing posts with label John I. Koivula. Show all posts
Saturday, August 15, 2020

Reversible Twinning In Neodymium Pentaphosphate

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For practising gemologists only. Neodymium pentaphosphate is a rare experimental synthetic material that shows reversible lamellar twinning ...
Saturday, August 01, 2020

Unknown Inclusion In Triphane Spodumene

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Raman microspectrometry wasn't able to identify the orange inclusion. This was because the crystal faces of the spodumene were etched, w...
Wednesday, October 30, 2019

Dioptase In And On Quartz

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Take a look. Useful link: https://www.gia.edu/gems-gemology/summer-2019-microworld-quarterly-crystal-dioptase-quartz
Wednesday, October 09, 2019

Lazurite In Spinel

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Take a look. Useful link: https://www.gia.edu/gems-gemology/spring-2019-microworld-lazurite-in-spinel
Monday, September 30, 2019

Inclusions In Natural, Treated, Synthetic, And Imitation Opal

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Take a look. Useful link: https://www.gia.edu/gems-gemology/summer-2019-suggested-reading-opal-chart
Saturday, August 24, 2019

Inclusions In Natural, Treated, Synthetic, And Imitation Opal

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Take a look at a wide range of interesting inclusions in opal. Useful link: https://www.gia.edu/gems-gemology/summer-2019-suggested-rea...
Thursday, April 25, 2019

Quarterly Crystal: Bubble In Fluorite

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Fluid inclusions are always a delight to observe. Useful link: https://www.gia.edu/gems-gemology/winter-2018-microworld-quarterly-crystal...
Sunday, April 07, 2019

Chart: Inclusions In Natural, Synthetic, And Treated Diamond

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A good reference chart from the GIA. Useful link: https://www.gia.edu/gems-gemology/winter-2018-inclusions-natural-synthetic-treated-diam...
Thursday, February 21, 2019

Prismatic Rutile In Quartz

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One of a kind gem inclusion. 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

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A good comparison study. Useful link: https://www.gia.edu/gems-gemology/winter-2017-inclusions-natural-synthetic-ruby
Thursday, December 21, 2017

Barite In Fluorite

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Crystal update. Useful link: https://www.gia.edu/gems-gemology/fall-2017-microworld-quarterly-crystal-barite-fluorite
Thursday, October 12, 2017

Quarterly Crystal: Molybdenite Phantoms In Quartz

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A must read. Useful link: https://www.gia.edu/gems-gemology/summer-2017-microworld-quarterly-crystal-molybdenite-phantoms-quartz
Monday, October 02, 2017

Cosalite In Quartz

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Take a look. Useful link: https://www.gia.edu/gems-gemology/summer-2017-microworld-cosalite-quartz
Saturday, September 30, 2017

Inclusions In Natural, Synthetic, And Treated Sapphire

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Take a look. Useful link: https://www.gia.edu/gems-gemology/summer-2017-inclusions-sapphire
Tuesday, August 15, 2017

Astrophyllite In Bastnäsite-(Ce)

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Take a look. Useful link: https://www.gia.edu/gems-gemology/spring-2017-microworld-astrophyllite-bastnasite
Tuesday, May 02, 2017

Quarterly Crystal: Growth Features On Titanite

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Take a look. Useful link: https://www.gia.edu/gems-gemology/winter-2016-microworld-quarterly-crystal-growth-features-titanite
Thursday, August 11, 2016

Multiphase Fluid Inclusions In Blue Sapphires From The Ilmen Mountains, Southern Urals

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Take a look. Useful link: http://www.gia.edu/gems-gemology/summer-2016-gemnews-multiphase-fluid-inclusions-blue-sapphires-ilmen-mountains...
Friday, June 03, 2016

A Fantastic Display Of Phase Changes In A Sapphire’s Fluid Inclusion

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Take a look. Useful link: http://www.gia.edu/gems-gemology/spring-2016-microworld-fantastic-display-phase-changes-sapphires-fluid-inclusi...
Sunday, April 03, 2016

“Dragon’s Eye” Fire Agate

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Take a look. Useful link: http://www.gia.edu/gems-gemology/winter-2015-microworld-dragons-eye-fire-agate