Blue Chalcedony
Translucent chalcedony in a soft, even blue.
- Family
- Chalcedony
- Formula
- SiO₂
- Mohs
- 6.5 to 7
- System
- Trigonal
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Science
Chalcedony is the general name for microcrystalline quartz; blue chalcedony is the plain, unbanded translucent variety with a light scattering effect that gives it a milky glow. The finest comes from Turkey and Namibia.
- Mineral
- Chalcedony (variety)
- Formula
- SiO₂
- Crystal system
- Trigonal
- Mohs hardness
- 6.5 to 7
- Specific gravity
- 2.58 to 2.64
- Refractive index
- 1.530 to 1.540
- Lustre
- Waxy to vitreous
- Colours
- Blue, Lavender
Composition
SiO₂. Made of Silicon, Oxygen.
Origin
- TurkeySarıcakaya
- Namibia
- India
- United StatesCalifornia, Oregon
Filled dots are primary sources
Rarity
Natural blue is uncommon; much commercial material is dyed.
- 1 Abundant
- 2 Common
- 3 Uncommon
- 4 Rare
- 5 Exceptional
Hardness
Blue Chalcedony sits at 6.5 to 7 on the Mohs scale. It will scratch glass and holds a polish in daily wear.
Energy
Associations from crystal-healing tradition, recorded here as folklore. They are not medical claims.
Chakras
- Throat
Element
- Water
Zodiac
- Cancer
- Sagittarius
Planets
- Moon
Properties
- Calm
- Listening
- Goodwill
- Emotional balance
Lore
The name is from Chalcedon, an ancient port on the Bosphorus. Roman orators wore it to improve their speech, and it was a sailor's charm against drowning.
Its modern reputation follows the ancient one: a stone for the throat and for speaking with care.
- StructureIntergrown fibres of quartz and moganite, too small to see.
- GlowLight scattering off the fibres produces the milky look.