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Last articles

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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Rutile - the Titanium Crystals

Rutile is a mineral of many forms and colors. It is quite widespread accessory mineral in many rocks but nice crystals are much less common. Rutile is also important source of titanium and has various industrial applications.


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Vanadinite - The Red Lead

Vanadinite is a popular secondary mineral species of vanadium and lead, occurring as an orange-red hexagonal crystals. Like many other exotic minerals, vanadinite has a complicated history of recognition and identification.


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Introduction to Mineral Cleaning

Mineral cleaning and preparation is such a complex subject that it could easily fill a whole book. This article is a brief introduction of available mineral cleaning methods and their pros and cons.


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Titanite, albite

Kovářov, Czech Republic

10 x 6 mm

Titanite, albite

Kovářov, Czech Republic

10 x 6 mm

Baryte, fluorite

Běstvina, Czech Republic

100 x 60 mm

Fluorite

Běstvina, Czech Republic

90 x 60 mm

Calcite

Příbram, Czech Republic

75 x 85 mm

Aragonite

Vitošov, Czech Republic

135 x 105 mm