Chalcedony

Chalcedony owes its name to the ancient city of Chalcedon, now called Kadıköy, a district of the city of Istanbul. Depending on the context, the term chalcedony has different meanings. It can be understood as a general term that indicates the varieties of quartz that are made of microscopic or submicroscopic crystals, the so-called microcrystalline varieties of quartz. These include agate, jasper, chrysoprase, carnelian and onyx.
The term chalcedony also indicates the mineral itself, a fibrous and cryptocrystalline variety of quartz. It is a secondary origin mineral deriving from the alteration of the silicates of the encasing rocks. They form the filling of more or less large cavities, within igneous rocks especially in the basic ones (geodes); these cavities are produced by the expansion of gases and magma vapors. Zoned structure are frequent in chalcedony and mainly clear in varieties that have color differences in individual areas such as agate and onyx. When pure, the chalcedony is whitish-bluish gray in color; however, the coloring is very variable as a consequence of impurities. The chalcedony is translucent to almost opaque.
Widely used and appreciated in the ancient world, it was thought to come exclusively from Egypt and Arabia. It is mainly mined in Uruguay and southern Brazil. The purest masses come from Ireland, the Faroe Islands, Syria, the East Indies, Greenland and the island of Sri Lanka.

India

Apophyllite, Stilbite, Chalcedony
India
830g

€750.00 Ex Tax: €750.00

A natural conformation of remarkable beauty. The creation of Mother nature never cease to amaze us.Here we have a combination of three minerals, Apophyllite, Stilbite and Calcedony with unique shapes...

Brazil

Calcite
Brazil
2,485g

€450.00 Ex Tax: €450.00

Rare and beautiful Calcite druse characterized by a fantastic color and sparkling surface.A must-have collector's item for a lover of exclusive minerals.A specimen to show off in your Wunderkammer or ..

Brazil

Chalcedony Cluster
Brazil
4,300g

€450.00 Ex Tax: €450.00

Great example of Chalcedony with a beautiful green / blue color, coming from the Brazilian mines of Minas Gerais.Unusual and fascinating cluster formation of crystals on a matrix positioned on a woode..

Brazil

Chalcedony Druse
Brazil
124kg

€5,600.00 Ex Tax: €5,600.00

Beautiful natural conformation. Mother Nature's work that has been able to recreate the jaws of time over millions of years. Polished by man, this example brings with it millions of years in which the..

Uruguay

Chalcedony Drusy
Uruguay
340mm

€360.00 Ex Tax: €360.00

Large Chalcedony druze from Uruguay, placed on a wrought iron pedestal specially created to best show the myriad of crystals inside the Druze.An excellent piece of furniture suitable for both professi..

Brazil

Chalcedony Druzy
Brazil
13kg

€600.00 Ex Tax: €600.00

This particular triangular shaped chalcedony and agate druse has been extracted from much larger natural conformations.The superficial chalcedony layer is very thick about two centimeters.The small cr..

Brazil

Chalcedony Druzy
Brazil
20kg

€900.00 Ex Tax: €900.00

The druse of Chalcedony has a narrow and long shape. Coined by Pliny the Elder the word calcite comes from the Latin calx which means limestone. The stratification of the elements can be seen in the s..

Brazil

Chalcedony Geode
Brazil
12kg

€550.00 Ex Tax: €550.00

Geode with an almost vale shape, sees in section the formation of several elements including agate and chalcedony. The alternation of these two minerals create a very unique color sequence. The intern..

Brazil

Chalcedony Geode
Brazil
11kg

€510.00 Ex Tax: €510.00

Geode of chalcedony and agate. The back of the geode shows the natural stone that has preserved this natural conformation for many years. Its iron pedestal gives the possibility to display it in any e..

Brazil

Chalcedony Geode
Brazil
25kg

€1,150.00 Ex Tax: €1,150.00

Fragment of chalcedony and agate extracted from a large geode with a singular shape.The crystals of calcite cover an agate layer abandoned on a base of quartz whose crystals are developed in irregular..

Showing 1 to 10 of 10 (1 Pages)
Agate and Calcite Druzy
Sold

Brazil

Agate and Calcite Druzy
Brazil
9kg

€400.00 Ex Tax: €400.00

Druse of agate and calcite with an almost diamond shape. The calcite covering the surface layer represents the last formation. Its micro crystals give the stone a velvety and soft appearance.On its ir..

Agate and Chalcedony Druzy
Sold

Brazil

Agate and Chalcedony Druzy
Brazil
14kg

€650.00 Ex Tax: €650.00

Druses can develop in many parts of the world. Being composed of several elements this type of conformation is particularly interesting as it contains the energies of several minerals. It is often use..

Chalcedony Druzy
Sold

Uruguay

Chalcedony Druzy
Uruguay
1,110g

€120.00 Ex Tax: €120.00

Druze of Chalcedony with a dark gray color and characterized by its typical surface composed of sparkling pretuberances.If placed in a room where natural sunlight enters, it will be a pleasure for the..

Chalcedony Druzy
Sold

Uruguay

Chalcedony Druzy
Uruguay
5,200g

€750.00 Ex Tax: €750.00

Druse of Chalcedony from Uruguay.Thanks to its typical blue-white color, it is a stone that relaxes and gives light to the environment where it is placed.Beautiful protruding crystals perfectly preser..

Chalcedony sphere with candle
Sold

Brazil

Chalcedony sphere with candle
Brazil
1,306g

€68.00 Ex Tax: €68.00

Exclusive candle holder made by carving a Chalcedony sphere.A characteristic and fascinating ornamental object that cannot be missing in the study of a mineral enthusiast...

Crystals of Apofillite and Calcedony
Sold

India

Crystals of Apofillite and Calcedony
India
520g

€240.00 Ex Tax: €240.00

A vary special formation of Apophyllite crystals on Chalcedony stalactites from India.Appreciable the shape of tis mineral that brings us back to the crystals of a magnificent coral, perfect as a piec..

Showing 1 to 6 of 6 (1 Pages)
Agate and Calcite Druzy
Sold

Brazil

Agate and Calcite Druzy
Brazil
9kg

€400.00 Ex Tax: €400.00

Druse of agate and calcite with an almost diamond shape. The calcite covering the surface layer represents the last formation. Its micro crystals give the stone a velvety and soft appearance.On its ir..

Agate and Chalcedony Druzy
Sold

Brazil

Agate and Chalcedony Druzy
Brazil
14kg

€650.00 Ex Tax: €650.00

Druses can develop in many parts of the world. Being composed of several elements this type of conformation is particularly interesting as it contains the energies of several minerals. It is often use..

India

Apophyllite, Stilbite, Chalcedony
India
830g

€750.00 Ex Tax: €750.00

A natural conformation of remarkable beauty. The creation of Mother nature never cease to amaze us.Here we have a combination of three minerals, Apophyllite, Stilbite and Calcedony with unique shapes...

Brazil

Calcite
Brazil
2,485g

€450.00 Ex Tax: €450.00

Rare and beautiful Calcite druse characterized by a fantastic color and sparkling surface.A must-have collector's item for a lover of exclusive minerals.A specimen to show off in your Wunderkammer or ..

Brazil

Chalcedony Cluster
Brazil
4,300g

€450.00 Ex Tax: €450.00

Great example of Chalcedony with a beautiful green / blue color, coming from the Brazilian mines of Minas Gerais.Unusual and fascinating cluster formation of crystals on a matrix positioned on a woode..

Brazil

Chalcedony Druse
Brazil
124kg

€5,600.00 Ex Tax: €5,600.00

Beautiful natural conformation. Mother Nature's work that has been able to recreate the jaws of time over millions of years. Polished by man, this example brings with it millions of years in which the..

Uruguay

Chalcedony Drusy
Uruguay
340mm

€360.00 Ex Tax: €360.00

Large Chalcedony druze from Uruguay, placed on a wrought iron pedestal specially created to best show the myriad of crystals inside the Druze.An excellent piece of furniture suitable for both professi..

Brazil

Chalcedony Druzy
Brazil
13kg

€600.00 Ex Tax: €600.00

This particular triangular shaped chalcedony and agate druse has been extracted from much larger natural conformations.The superficial chalcedony layer is very thick about two centimeters.The small cr..

Chalcedony Druzy
Sold

Uruguay

Chalcedony Druzy
Uruguay
1,110g

€120.00 Ex Tax: €120.00

Druze of Chalcedony with a dark gray color and characterized by its typical surface composed of sparkling pretuberances.If placed in a room where natural sunlight enters, it will be a pleasure for the..

Brazil

Chalcedony Druzy
Brazil
20kg

€900.00 Ex Tax: €900.00

The druse of Chalcedony has a narrow and long shape. Coined by Pliny the Elder the word calcite comes from the Latin calx which means limestone. The stratification of the elements can be seen in the s..

Chalcedony Druzy
Sold

Uruguay

Chalcedony Druzy
Uruguay
5,200g

€750.00 Ex Tax: €750.00

Druse of Chalcedony from Uruguay.Thanks to its typical blue-white color, it is a stone that relaxes and gives light to the environment where it is placed.Beautiful protruding crystals perfectly preser..

Brazil

Chalcedony Geode
Brazil
12kg

€550.00 Ex Tax: €550.00

Geode with an almost vale shape, sees in section the formation of several elements including agate and chalcedony. The alternation of these two minerals create a very unique color sequence. The intern..

Brazil

Chalcedony Geode
Brazil
11kg

€510.00 Ex Tax: €510.00

Geode of chalcedony and agate. The back of the geode shows the natural stone that has preserved this natural conformation for many years. Its iron pedestal gives the possibility to display it in any e..

Brazil

Chalcedony Geode
Brazil
25kg

€1,150.00 Ex Tax: €1,150.00

Fragment of chalcedony and agate extracted from a large geode with a singular shape.The crystals of calcite cover an agate layer abandoned on a base of quartz whose crystals are developed in irregular..

Chalcedony sphere with candle
Sold

Brazil

Chalcedony sphere with candle
Brazil
1,306g

€68.00 Ex Tax: €68.00

Exclusive candle holder made by carving a Chalcedony sphere.A characteristic and fascinating ornamental object that cannot be missing in the study of a mineral enthusiast...

Crystals of Apofillite and Calcedony
Sold

India

Crystals of Apofillite and Calcedony
India
520g

€240.00 Ex Tax: €240.00

A vary special formation of Apophyllite crystals on Chalcedony stalactites from India.Appreciable the shape of tis mineral that brings us back to the crystals of a magnificent coral, perfect as a piec..

Showing 1 to 16 of 16 (1 Pages)