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.

Brazil

Agate and Calcite Druzy
Brazil
20kg

€900.00 Ex Tax: €900.00

The druse of Agata and Calcite 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 i..

Brazil

Agate and Calcite Druzy
Brazil
13kg

€600.00 Ex Tax: €600.00

This particular druse of agate and calcite with a triangular shape, has been extracted from much larger natural conformations. The superficial calcite layer is very often about two centimeters. The sm..

Brazil

Agate and Calcite Geode
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..

Brazil

Agate and Calcite Geode
Brazil
12kg

€550.00 Ex Tax: €550.00

Geode with an almost oval shape, sees in section the formation of several elements including agate and calcite. The alternation of these two minerals creates a very unique color sequence. The inner ca..

Brazil

Agate and Calcite Geode
Brazil
11kg

€510.00 Ex Tax: €510.00

Agate and calcite geodes. The back of the geode shows the natural stone that for many years has guarded this natural configuration. Its iron pedestal gives the possibility to display it in every room,..

Brazil

Agate and Calcite Geode
Brazil
25kg

€1,150.00 Ex Tax: €1,150.00

Fragment of agate and calcite 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 wa..

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...

Uruguay

Calcite Drusy
Uruguay
340mm

€360.00 Ex Tax: €360.00

Large Druze of Calcite 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..

Showing 1 to 8 of 8 (1 Pages)
Agate and Calcite Druzy
Sold

Brazil

Agate and Calcite 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..

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..

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 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 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)

Brazil

Agate and Calcite Druzy
Brazil
20kg

€900.00 Ex Tax: €900.00

The druse of Agata and Calcite 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 i..

Agate and Calcite Druzy
Sold

Brazil

Agate and Calcite 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..

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..

Brazil

Agate and Calcite Druzy
Brazil
13kg

€600.00 Ex Tax: €600.00

This particular druse of agate and calcite with a triangular shape, has been extracted from much larger natural conformations. The superficial calcite layer is very often about two centimeters. The sm..

Brazil

Agate and Calcite Geode
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..

Brazil

Agate and Calcite Geode
Brazil
12kg

€550.00 Ex Tax: €550.00

Geode with an almost oval shape, sees in section the formation of several elements including agate and calcite. The alternation of these two minerals creates a very unique color sequence. The inner ca..

Brazil

Agate and Calcite Geode
Brazil
11kg

€510.00 Ex Tax: €510.00

Agate and calcite geodes. The back of the geode shows the natural stone that for many years has guarded this natural configuration. Its iron pedestal gives the possibility to display it in every room,..

Brazil

Agate and Calcite Geode
Brazil
25kg

€1,150.00 Ex Tax: €1,150.00

Fragment of agate and calcite 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 wa..

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...

Uruguay

Calcite Drusy
Uruguay
340mm

€360.00 Ex Tax: €360.00

Large Druze of Calcite 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..

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 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 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 14 of 14 (1 Pages)