Open Adit™ - Chalcedony Datasheet

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Chalcedony is one of the cryptocrystalline varieties of the mineral quartz, having a waxy luster. It may be semitransparent or translucent and is usually white to gray, grayish-blue or some shade of brown, sometimes nearly black. Other shades have been given different names. A clear red chalcedony is known as carnelian or sard; a green variety colored by nickel oxide is called chrysoprase. Prase is a dull green. Plasma is a bright to emerald-green chalcedony that is sometimes found with small spots of jasper resembling blood drops; it has been referred to as blood stone or heliotrope. Chalcedony is one of the few minerals other than quartz that is found in geodes.

Chemistry:

SiO₂ - Silicon dioxide

Class

Subclass:

Group:

Red, pink, green, brown, yellow, black, blue-gray, purple, colorless.

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; metamorphic 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:

An important raw material in the glass industry. Gemstones and ornamental stones

Chalcedony Gallery

Metaphysical Properties

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