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Clarity:
Semi-transparent
to opaque
Optic Character: AGG
Cause
of Color: Many
causes; dependent on the variety
Fluorescence:Generally
Inert
Fracture
:
Concoidal, sometimes granular
Luster
:
Vitreous
when polishe; dull to waxy rough
Cleavage : None
Durability:
Good
Characteristics
for Identification:
Dependent
on Variety
Locality:
Commonly found around the world
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Chalcedony
SiO2
(Silicon Dioxide)
Chalcedony
is microcrystalline quartz. The word is often used to encompass
all varieties of microcrystalline quartz such as jasper,
carnelian, chrysoprase
and bloodstone. The mineral
is very abundant and found all over the world.The most common
variety is a muted blue-gray tone (unnamed) found in geodes
and vugs. Curiously, this variety has no folk lore associated
with it. New age practitioners see this translucent gray
stone as lacking in "vibes".
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