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Gems of the Feldspar Group
Fissue Filler: a Time Bomb
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about various aspects of our research
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GemRocks
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Lookalikes
4
Imitations
12
Toxic Minerals
3
News
Cinnabar (vermilion) - Quartz / Opal
Eclipse / Bumblebee Stone (Calcite with arsenic sulfides)
Lead in Amazonite - Caution
Obsidian: natural product versus artificial glass
Fluorite-Opal-Jasper (»Tiffany Stone«)
Ye Ming Zhu - luminescent stones
»Rainbow Calsilica« - a colorful man-made rock
POLYBERN in a new look
Snakeskin Agate, Fire Agate and Fire Carnelian
»GE POL« Diamonds - an overview
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GO
EPI-Lab
About Us
Informations
New Gemrocks
Lookalikes
Imitations
Toxic Minerals
Topics
Alexandrite Imitations
What is »Aventurine«?
Chloromelanite
»Chrysanthemum Stones«
Corals
Fire Opal
Gems of the Feldspar Group
Fissue Filler: a Time Bomb
Larimar
Magnesite
Obsidian Imitations
What is »Prasem« ?
"Smaragdite"
Turquoise Imitations
Services
Documentation
Prices
Contact