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Last articles

Hematite - The Bloodstone

Hematite is the abundant form of iron oxide, natural red pigment, and an integral part of the largest iron ore deposits on Earth. Highly aesthetic crystals and shiny botryoidal hematite aggregates are also very popular collector specimens.


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Vivianite - The Green Iron

Vivianite is found in many geological environments. Its great blue-green crystals are very rare and very popular among collectors. Also vivianite filled fossil shells are among very interesting and popular collectors items.


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Molybdenite - The Greasy Mineral

Molybdenite is the principal ore mineral of molybdenum and rhenium. It occurs widely in igneous and metamorphic rocks generated under high temperature conditions. Despite its lack of popularity and rare crystal forms, it is a very interesting and important industrial mineral.


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Crocoite - The Red Lead

Crocoite is a rare lead and chromium secondary mineral. Its rarity, bright red color, and exceptional crystal forms have guaranteed its place as a prized collection mineral. Crocoite is the first historic source of chromium and natural yellow pigment - unfortunately highly toxic.


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Opal - The Colorful Silica

Opal is most valued for the rich variety of colors it exhibits, their interplay in ordinary light, and their unusual range of fluorescence. These attributes have guaranteed its continuing value as a gemstone since pre-Roman times.


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Arsenic, arsenolite

Jáchymov, Czech Republic

70 x 55 mm

Quartz, calcite

Banská Štiavnica, Slovak Republic

115 x 75 mm

Chabazite (var. phacolite)

Rytina soutěska, Czech Republic

5 x 4 mm

Thomsonite-(Ca)

Folknáře, Czech Republic

40 x 30 mm

Titanite, albite

Kovářov, Czech Republic

10 x 6 mm

Titanite, albite

Kovářov, Czech Republic

10 x 6 mm