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Chalcedony

Mineral: crypto-crystalline quartz  
Formula: SiO2  
Mohs: 7  
Colour: Various,  including translucent blue
Crystal Habit:  microcrystalline (crypto-crystalline)
Crystal System:  Trigonal
Source:  Worldwide
As a cryptocrystalline form of silica (silica dioxide) it is composed of very fine inter-growths of the minerals quartz and morganite.  Other varieties of Chalcedony include Agate,  Aventurine, Bloodstone, Carnelian, Sard, Chrysophase and all Jaspers.  

Many non-banded forms of chalcedony - such as Moss agate - are often erroneously called 'agates '. True agate is concentrically banded. Mottled and included chalcedonies are more properly called simply chalcedony Petrified wood (agatized wood) is the name given to fossil wood where the replacement of the wood is by chalcedony, but the banding in this case is due to the wood structure - not concentric deposition of the chalcedony - and the material is chalcedony, not true agate.

Metaphysical
Blue Chalcedony. Known as the ‘Creative Stone’.
Mineral: crypto-crystalline quartz  
Formula: SiO2  
Mohs: 7  
Colour: translucent blue
Source:  India
Astrological sign:  Cancer & Sagittarius
Keywords: calm, balance, centeredness, inner knowledge, communication.  
Element:  Water  
Chakra:  Throat (5th) Brow (6th)

Use:  alleviates hostilities, irritability & melancholy. It enhances generosity, responsiveness & receptivity. Opens the mind to assimilate new ideas & helps acceptance of new situations. Also to provide a pathway for receiving thought transmissions.

Healing: for helping with dementia, senility & to increase mental stability. Soothing all physical & emotional throat problems.  Can be used as an elixir.

The Care, Cleansing and Energisyng of Crystals & Minerals

*Warning! Not all crystals and minerals can be used to make an elixir.  If in doubt  - don’t!