Galena

Galena is a lead sulfide belonging to the mineralogical group of the same name; it is the primary ore mineral of lead. It crystallizes in the cubic crystal system and often shows octahedral forms. These forms can be combined and rarely form thin layers and twins. The crystals are lead grey and occur in granular, coarse or compact, skeletal or stalactite aggregates; they have metallic lustre and opaque transparency. The crystals are bright when fresh but often tarnish after exposure to air; in the latter case the galena appears to be altered by weathering and partially transformed into lead carbonates, oxides and sulphates. The surface of the crystals is often rough, sometimes covered with quartz, calcite and chalcopyrite.
Often the galena contains small percentages of silver and for this reason it is also called argentiferous galena. It is often associated with minerals such as sphalerite, calcite and fluorite. It is found in ore veins of hydrothermal origin, with sphalerite, pyrite and chalcopyrite.
The largest deposits are located in the United States (Missouri, Oklahoma, Kansas, Colorado, Utah, Idaho), England (Cumberland), Australia (Broken Hill and Mount Isa), Germany (Erzgebirge), Mexico (Eulalia) , Bulgaria (Rodophe mountains) and in the ancient mines of Sardinia. Large crystals are also found in the Stříbro deposit, near Příbram, in the Czech Republic.
In the past, galena was extracted more for its silver content than for the production of lead. In the last century, before the fall in the price of silver, this precious metal took on interesting economic connotations as a highly profitable by-product of the galena mines. It was used as the crystal in crystal radio receivers, in which it was used as a point-contact diode capable of rectifying alternating current to detect the radio signals. It is also used in a green glaze applied to pottery.

Galena
155cm

€260.00 Ex Tax: €260.00

A notable specimen from Bulgaria and specifically from the Madan mine.Galena is also known as the argentiferous galena and crystallizes in the cubic or octahedral system.Its name derives from the Gree..

Galena
130mm

€280.00 Ex Tax: €280.00

Size: 130×225×125 mmWeight: 3130gProvenance: Madan Mines, BulgariaGalena with its chemical formula PbS, is the first mineral for Lead Content, in fact it contains more than 80%.This particular mineral..

Galena and Quartz
171mm

€375.00 Ex Tax: €375.00

Originating from Bulgaria, this specimen has two minerals such as galena and quartz.The galena crystallizes in the cubic or octahedral system while the quartz crystallizes in the trigonal system.Here ..

Bulgaria

Pyrite, Galena, Quartz
Bulgaria
3,705g

€480.00 Ex Tax: €480.00

Wonderful block of crystals, composed of a Galena matrix from which emerge a myriad of quartz points with some small specimens of cubic pyrite.A contrast of fascinating colors and shapes for a collect..

Bulgaria

Pyrite, Galena, Quartz
Bulgaria
6,818g

€450.00 Ex Tax: €450.00

A fantastic specimen composed of a Calcite matrix interspersed with luminous and sparkling cubic Pyrite.A contrast of colors that gives the mineral brightness and highlights every type of crystallizat..

Showing 1 to 5 of 5 (1 Pages)
Galena
Sold

Galena
150cm

€210.00 Ex Tax: €210.00

Lead sulphide, the galena was first described by Pliny the Elder. The hardness of this mineral reaches 2.5 on the Mohs scale and has a gray color with shades that bring you closer to the color of silv..

Galena and Quartz
Sold

Bulgaria

Galena and Quartz
Bulgaria
160mm

€300.00 Ex Tax: €300.00

The beauty of this sample of galena and quartz is given by the presence of small quartz crystals that cover the entire surface.The chromatic contrast between the two minerals is truly unique. Mother N..

Pyrite, Galena, Quartz
Sold

Bulgaria

Pyrite, Galena, Quartz
Bulgaria
5,250g

€380.00 Ex Tax: €380.00

Magnificent specimen of Galena with Pyrite an Quartz, we often find these minerals in association.Note the perfectly cubic pyrite crystals that  are naturally perfectly formed between very white ..

Showing 1 to 3 of 3 (1 Pages)

Galena
155cm

€260.00 Ex Tax: €260.00

A notable specimen from Bulgaria and specifically from the Madan mine.Galena is also known as the argentiferous galena and crystallizes in the cubic or octahedral system.Its name derives from the Gree..

Galena
Sold

Galena
150cm

€210.00 Ex Tax: €210.00

Lead sulphide, the galena was first described by Pliny the Elder. The hardness of this mineral reaches 2.5 on the Mohs scale and has a gray color with shades that bring you closer to the color of silv..

Galena
130mm

€280.00 Ex Tax: €280.00

Size: 130×225×125 mmWeight: 3130gProvenance: Madan Mines, BulgariaGalena with its chemical formula PbS, is the first mineral for Lead Content, in fact it contains more than 80%.This particular mineral..

Galena and Quartz
171mm

€375.00 Ex Tax: €375.00

Originating from Bulgaria, this specimen has two minerals such as galena and quartz.The galena crystallizes in the cubic or octahedral system while the quartz crystallizes in the trigonal system.Here ..

Galena and Quartz
Sold

Bulgaria

Galena and Quartz
Bulgaria
160mm

€300.00 Ex Tax: €300.00

The beauty of this sample of galena and quartz is given by the presence of small quartz crystals that cover the entire surface.The chromatic contrast between the two minerals is truly unique. Mother N..

Pyrite, Galena, Quartz
Sold

Bulgaria

Pyrite, Galena, Quartz
Bulgaria
5,250g

€380.00 Ex Tax: €380.00

Magnificent specimen of Galena with Pyrite an Quartz, we often find these minerals in association.Note the perfectly cubic pyrite crystals that  are naturally perfectly formed between very white ..

Bulgaria

Pyrite, Galena, Quartz
Bulgaria
3,705g

€480.00 Ex Tax: €480.00

Wonderful block of crystals, composed of a Galena matrix from which emerge a myriad of quartz points with some small specimens of cubic pyrite.A contrast of fascinating colors and shapes for a collect..

Bulgaria

Pyrite, Galena, Quartz
Bulgaria
6,818g

€450.00 Ex Tax: €450.00

A fantastic specimen composed of a Calcite matrix interspersed with luminous and sparkling cubic Pyrite.A contrast of colors that gives the mineral brightness and highlights every type of crystallizat..

Showing 1 to 8 of 8 (1 Pages)