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DKW Crystals
Herkimer ‘Diamond’.
Mineral: macro-crystalline silicone dioxide  
Formula: SiO2  
Mohs: 7-7.5  
Colour:  colourless/clear  
Source:  USA

Are, in fact, double terminated, quartz crystals first discovered in Herkimer County, New York State, USA.  They are also known as the Little Falls Diamond and Middleville Diamond. Although they are highly lustrous, both clear and cloudy quartz, Herkimer’s can have inclusions, impurities caught inside, some enclosing water (enhydro) which has been caught inside the crystals as they have grown, others can have phantoms, a crystal within a crystal.  Other double terminated quartz crystals of the same configuration are found in India, Pakistan and are referred to as Herkimer-like!

Metaphysical
Herkimer Diamond.  Known as the ‘Attunement’ stone.  
Astrological Sign: Sagittarius  
Keywords: dreams, visions, psychic & telepathic abilities
Element: Storm  
Chakra:  Crown (7th) Brow (6th)
Use: facilitates the manifestation of dreams, clairvoyance & telepathic communication. As a double terminated quartz, it can re-direct & strengthen energy along the meridians, Chakras & to other crystals & minerals.
Healing: for tension, memory & general healing. Dispersing toxins accumulated in the body  Can be used as an elixir & has  piezo-electric potential.
The information on the crystals & minerals has been researched from numerous sources.
If you would like to expand your knowledge further, there are several web sites and books we recommend:
Web Sites
Books
www.mindat.org
HEALING CRYSTALS
Michael Gienger Earthdancer Findhorn Press  ISBN 978-1-84409-067-9
www.wikipedia.org
LOVE IS IN THE EARTH  
Melody  Earth-Love publishing House  ISBN 0-9628190-3-4
www.dkwcrystals.co.uk
THE BOOK OF STONES
Robert Simmons & Naisha Ahsian  Heaven & Earth Publishing LLC   
ISBN 0-9621910-3-5
QUARTZ CRYSTALS
Isable Silveira Earthdancer Findhorn Press  ISBN 978-1-84409-148-5