For this compilation of gem stone information and data, following but not only the following sources were studied and used:

Gemstone Feng Shui – Sandra Kynes
The Little Book of Crystal Tips & Cures – Philip Permutt
Healing Crystals – Michael Gienger
The Crystal Bible – Judy Hall
The Crystal Bible Volume 2- Judy Hall
Cunningham’s Encyclopedia of Crystal, Gem & Metal Magic – Scott Cunningham
The Book of Stones – Robert Simmons & Naisha Ahsian
Crystal Prescriptions – Judy Hall
Crystal Awareness – Catherine Bowman
The Power of Gems and Crystals – Soozi Holbeche
Crystal Power – Michael G. Smith
Healing Crystals and Gemstones – Dr. Flora Peschek- Bohmer and Gisela Schreiber
Moldavite: Starborn Stone of Transformation – Robert Simmons and Kathy Warner
Crystal Healing Volume 2 – Katrina Raphaell
The Complete Crystal Guidbook – Uma Silbey
Crystal Prosperity – Judy Hall
Wikipedia –

All photographs not made by Tubular X Consulting, were taken from wiki vommons under one of the public licences. The authors are attributed in each of these photographs.