A general term for fibrous cryptocrystalline quartz. It is common in petrified wood, and fills open spaces in many volcanic rocks. If colorful, it may be called agate.
It is a term which refers to the various types of colored stone, including milky, carnelian, agate, cat's eye and also jasper.
Also referred to as “agate,†chalcedony is a semi-translucent silicate (quartz) rock with a wax-like luster. It is available in a wide range of colors including red (carnelian) and greyish-blue. When hung about the neck it is said to defend against enemies and help keep the body healthy and vigorous.
A type of microcrystalline quartz with hydrated silica (opal). It appears naturally in bluish greys to brownish-reddish colors to white or cream. Because of its molecular structure, it is very porous and easy to dye. The name is derived from an ancient town along the Bosphorus.
a type of semi-precious stone; a type of quartz with very fine crystals, often grey or blue in colour
A semi-translucent silicate (quartz) rock with a wax-like luster and a great range of colours, used as raw material for the manufacture of chipped stone artifacts. Commonly called agate.
Rev.21:19] gemstone mineral resembling white agate w/color of milk diluted in water. Contains veins, spots, and circles.
a milky or grayish translucent to transparent quartz
A class of microcrystalline quartz that includes agate, jaspers, tiger eye, bloodstone, sardonyx, chrysoprase and others. Petrified wood is also sometimes composed of chalcedony that has replaced the original organic material.
Various types of colored quartz, usually with a milky appearance, including carnelian, agate, cats eye and jasper.
A cryptocrystalline variety of quartz. It is commonly microscopically fibrous, may be translucent or semitransparent, and has a nearly waxlike luster, a uniform tint, and a white, pale-blue, gray, brown, or black color.
Chalcedony - Layered, colorless to gray cryptocrystalline silica; the term agate is used if the mineral is colored.
cryptocrystalline quartz and much chert material agate is made of has a great array of colours: blue, gray, black, off-white, purple (deccomposition of iron-bearing minerals) in Hall's Gap geodes sulfide mineralization occurs in chalcedony geode
Chalcedony is a family of minerals that are often milky to gray to bluish in color. Chalcedony is porous and translucent. Chalcedony has a hardness of 6.5-7.
May be semi-transparent to translucent, and is one of the few minerals other than quartz to be found in geodes. Some spiritualists believe that it is an excellent stone to aid and improve one's character.
Chalcedony is a family of minerals (microcrystalline quartz) that are often milky to gray to bluish in color. Chalcedony includes agate, carnelian (waxy red), chalcedony (blue), chrysoprase (green), onyx (black and white), bloodstone, sard (brownish-red), jasper (hornstone), seftonite, and others.
is the cryptocrystalline variety of quartz. They form in massive semitransparent to translucent material, often found in white, gray, black, browns and varying intensities of all colors.
Chalcedony is receptive and promotes peace, protection and is good for nightmares. It is common with other stones in that it banishes fear, depression and sadness. In the 16th century it was prescribed by magicians to dissolve illusions and fantasies. Italian mothers wear beads of chalcedony to increase lactation. See also: bloodstone and carnelian
(13th century, named after an ancient city in Turkey near Istanbul) Chalcedony is a variety of quartz and can be transparent, translucent or opaque. There are many types and colours of chalcedony, some of which are covered in this list of stones, including agate, bloodstone, chrysoprase, carnelian, jasper, onyx and sardonyx.
Chalcedony represents a family of fine-grained quartz crystals including agate, chyrsoprase, bloodstone, jasper, carnelian, moss agate, onyx and sard. There is also a bluish-white-gray variety known as chalcedony. On Mohs’ scale of hardness, chalcedonies are 6.5 – 7. In their natural state, they have a waxy or dull luster. For source information, see specific stones. (See Chalcedony Facts.) (Note: Sources listed in order of primary and secondary deposits.)
Any type of quartz which has a cloudy, noncrystalline appearance such as agate. Its common colors are blue-gray, white (cream), and red-brown.
A variety of quartz (silicon dioxide), often with some iron and aluminum. It has a hardness of 7 on the Mohs' scale.
The group name for cryptocrystalline varieties of silica composed of minute crystals of quartz with submicroscopic pores;
Refers to various types of colored quartz, usually those with a milky appearance like carnelian, agate, cat's eye, and jasper.
A family of minerals that is often milky to grey to bluish in colour.
Chalcedony is one of the cryptocrystalline varieties of the mineral quartz, having a waxy luster. Chalcedony 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.