Obsidián 3 - wiki

Obsidian from Mount Vesuvius, Italy. Author: Pogány Péter. Source:

Obsidian Drakkaria sipka-hnedy-obsidian-nahrdelnik_2

Obsidian arrow pendant. Source:

Obsidian is naturally occurring volcanic glass; it is formed during cooling at edges of lava field or where lava comes into contact with water. It… Continue reading


Carnelian. Source: book “Drahé kameny” by Jiří Zimák, Vydavatelství Univerzity Palackého v Olomouci, 2008

Karneol - náhrdelník Chisties

Necklace made of carnelian and gold, Egyptian New Kingdom (dynasty XVIII-XIX, 1550-1196 BC). Source:

Belonging among general gemstones, carnelian (also cornelian) is a translucent variety… Continue reading


chalcedon 1 z knihy

Width of the photo: 58 mm, Slovakia. Source: Drahé kameny, Jiří Zimák, Vydavatelství Univerzity Palackého v Olomouci, 2008

Belonging among general gemstones, chalcedony is the translucent variety of quartz. Often we can see it in different shades of white, grey,… Continue reading

Iceland spar (crystal)

isl.kristal wiki


Iceland spar is a transparent birefringent calcite or also Icelandic limestone (crystallized calcium carbonate). (Note: crystal generally will be described in other post…). It became well-known because of the Vikings who used it as “sun-stone”, capable to determine… Continue reading

Bohemian garnet

Bohemian garnet is transparent to translucent pyrope from Czech sites. Pyrope (magnesium aluminum silicate) is a cubic mineral from group of garnets, where there are about 20 types, which vary in chemical composition as well as in size from… Continue reading


Moldavite (or in Czech “vltavín”) – green translucent tektite (rock formed by extraterrestrial impact) is essentially natural quartz glass with other impurities that is by 99% found only in southern Bohemia (here then most in the area between Písek and… Continue reading


Metallic, opaque, gray-black, black or red-brown in color, hematite can be found in North and South America, Australia, Asia and in some parts of Europe (in the Czech Republic there are rather less important deposits); on the island of Elba,… Continue reading




Amethyst is a variety of quartz which is found in various shades of purple; this colour is caused by natural gamma radiation and impurities of iron and aluminium; amethyst can be translucent to transparent; coloration is often uneven.… Continue reading


Belonging among general gemstones, amazonite is a variety of microcline feldspar. Although feldspars are the most common minerals in the world (60%), only a few varieties are also gemstones. It occurs in the colors green, blue-green and green-white; it is… Continue reading