About Chalcedony

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Keep reading to discover more about chalcedony

  • Mineralogy and geology*
  • Common Associations
  • Metaphysical, Spiritual and Healing* Properties*

How to pronounce CHALCEDONY 

Mineralogy and Geology of Chalcedony

Mineral formula: SiO2

Crystal system: trigonal

Crystal habit: fibrous aggregates of parallelly grown ("fibrous") quartz crystals of microscopic and sub-microscopic size. In larger specimens, the "fibers" grow in botryoidal, rounded and stalactitic habits. They often show concentric banding perpendicular to the fiber orientation and are then called Agate.

Cleavage: none

Fracture: conchoidal, sub-conchoidal

Color: colorless, white, to any shade of any color depending on included minerals

Luster: waxy, dull; can be vitreous when polished

Diaphaneity: translucent

Moh’s scale hardness: 6 ½ - 7

Streak: colorless

Specific gravity: 2.6

Named after: the town of Chalcedon, now called Kadıköy, and a district within the city of Istanbul, Turkey.

Geological occurrence: Chalcedony occurs in many different geological settings, including: nodules, vein fillings, crusts in volcanic rocks; as sinter-like crusts in low- to medium temperature hydrothermal veins; in silica-rich marine sedimentary rocks; as nodular concretions and layers in limestones and marls; as a metasomatic replacement in limestones and marls ("replacement chert"); as cement in sandstones; replacing other minerals as pseudomorphs; as a fossilizing material (petrified wood, coral agate).

 

Common Associations

  • Chakra – depends on color and type
  • Numerology - vibrates to the number 9
  • Planets – variable, depends on the type
  • Zodiac – Cancer, Sagittarius
  • Birthstone – variable, depends on the type of chalcedony
  • Wedding Anniversary – variable, depends on the type of chalcedony

 

Spiritual, Metaphysical and Healing Properties

Chalcedony has a nurturing energy, promoting feelings of brotherhood, benevolence, generosity, responsiveness, receptivity and good will. Chalcedony brings the mind, body, emotions and spirit into harmony by removing hostility, sadness, self-doubt, and other negative thoughts and emotions. Each type / color of chalcedony may have additional properties.

When working with crystal grids, chalcedony can be used in similar ways to quartz, although its energy is gentler.

 

Common Associations

  • Chakra – depends on color and type
  • Numerology - vibrates to the number 9
  • Planets – variable, depends on the type
  • Zodiac – Cancer, Sagittarius
  • Birthstone – variable, depends on the type of chalcedony
  • Wedding Anniversary – variable, depends on the type of chalcedony

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* Always consult with your medical professional for any physical or long-term healing issues.

* Mineralogical information is from mindat.org

* Metaphysical properties come from 

Love Is in the Earth (1995) Melody, Earth-Love Publishing House, 726 pp.

The Crystal Bible, A Definitive Guide to Crystals (2003) Judy Hall, Walking Stick Press, 399 pp.

Crystal Muse (2017) Heather Askinosie and Timmi Jandro, Hay House, 285 pp.

Crystal Gridwork (2018) Kiera Fogg, Weiser Books, 128 pp.