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Home / Gem Library / Gemstones Varieties / Chalcedony November 23, 2017

Natural Chalcedony

The name chalcedony is applied to any fine grained quartz with a fibrous or crypto- crystalline microstructure. It often displays some kind of distinctive banding. The name agate is used for the sub variety of chalcedony which displays distinctive banding with successive layers differing in color and degree of translucency.


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Our Chalcedony(s) are available in various shapes, sizes and colors. 60 Chalcedony(s), too many to look through? You may select any combination of search options. Colors grade into each other and you can search for more than one color at once. For a better selection, try selecting two or three colors, -- your first choice plus the two closest colors.

Shape Length (mm) Width (mm)
Category Weight (cts) Price (USD)
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violetish blue
bluish purple
bluish violet
purple





Chalcedony Profile

Color information: grayish, purple, white, green, blue, lavender, yellow, brown.
Refractive Index: 1.530 - 1.539
Chemical Composition: SiO2
Hardness: 6.5
Density: 2.57 2.64
Crystal Group: Hexagonal
Ocurrence: Brazil, U.SA. Germany, India, Uruguay, Austarlia, Egypt, Italy, Scotland, South Africa, Namibia, Madagascar, Mexico, Tanzania, and many other localities throughout the world.
Sign of the Zodiac: N/A
Month of the year: N/A
Chalcedony Chalcedony Chalcedony Chalcedony
The individual fibers of chalcedony and its subvarieties are not physically separable; they occur as parallel or near parallel aggregates or as spherules. The fiber direction is perpendicular to the layering while the banding is parallel to the free surface or cavity in which the chalcedony occurs.

The hardness of chalcedony is variable around 6.5; somewhat lower than that of more coarsely crystallized quartz which has a hardness of 7. The specific gravity also varies according to porosity, water content, and the presence of other substances. The normal range is 2.57 2.64. Chalcedony is about 90 99% SiO2. Brown and reddish varieties are higher in Fe2O3.

Chalcedony fractures easily across the banding to give a splintery surface with a waxy luster. Most chalcedony is somewhat pale and grayish in appearance.

Chalcedony is deposited in a variety of environments and deposition is commonly at low temperatures. Light colored material is often found as a late hydrothermal deposit or an alteration product in acidic or basic igneous rocks, tuffs and breccias. It is very common as crusts of vein or cavity fillings.

The most prized of the chalcedonies are the translucent green stones known as chrysoprase and the brown iridescent and colorful stones known as fire agates. Other important kinds of chalcedony include bloodstone, lace agate, sard, iris agate, onyx, and carnelian.

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Chalcedony range/
Chalcedony Single
Chalcedony Single Round Translucent
Size: 24.00 X 24.00 MM
Weight: 41.880 CTS
Shape: Round
Clarity: Translucent
Usually ships within 24 hours
RECOMMENDED
OUR PRICE
USD 90.88
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Chalcedony Calibrated
Chalcedony Calibrated Round Translucent
Size: 4.50 X 4.50 MM
Weight: 0.500 CTS
Shape: Round
Clarity: Translucent
Usually ships within 24 hours
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OUR PRICE
USD 1.09
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