Open Adit™ - Agate Datasheet

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Agate is a variety of chalcedony (a family of microcrystalline quartz). Agate is a very common stone that is often used in jewelry. It is found in a wide range of colors, including black, gray, brown, reddish, green, pink, blue, and yellow. Agate can be flecked with color and is often banded, exhibiting layers of quartz. Agate is porous and takes dye easily; it is frequently dyed to enhance the coloration and the banding. White agate was used often in Victorian jewelry, mostly as a background. Moss agate has green, red or black dendritic inclusions. Onyx is agate whose bands are parallel. Eye agate has banding arranged in concentric circles.

Youngite is a local name applied to the mottled pink, white and gray agate that has been described as a mixture of drusy quartz and banded agate covering yellow and pink breccia, and is found in caves formed in rocks of Mississippian age near Guernsey and Glendo, Wyoming.

Chemistry:

SiO₂ - Silicon dioxide

Class:

Silicates

Group:

Quartz (A variety of Chalcedony)

Crystal:

Triagonal

Color:

Banded colors of red, green, brown, yellow, white, black

Streak:

White

Luster:

Vitreous

Diaphaneity:

Transparent to Translucent, opaque

2.6

None

Conchoidal

Long to short prismatic, acicular, dipyramidal to tabular crystals, concretions, geodes, granular, massive

Luminescence:

Non-fluorescent

Frequency:

Common

Origin:

Magmatic in different types of rocks, mainly in granites, granitic pegmatites and volcanic rock; metamophic in different types of rocks, mainly in quartzites and mica schists; hydrothermal in different types of ore and Alpine type veins; secondary in oxidation zone of ore deposits; also in different types of sedimentary rocks and in organic remains, also in placers.

Occurence:

Brazil, United States, Italy

Application:

Gemstones and ornamental stones

Agate Gallery

Youngite Gallery

Metaphysical Properties

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