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Concentration of halite crystals

Halite is a mineral from the halides group; its main component is sodium chloride (NaCl). A monomineral rock composed of halite constitutes halite rock salt, commonly known as rock salt. The presented specimen has a historical nature and it comes from the Crystal Grotto in the Wieliczka Salt Mine.

“Vaca Muerta” meteorite

In the classification of meteorites, Vaca Muerta belongs to a small group of iron and stone meteorites known as mesosiderites. Mesosiderites are meteorites containing both stone and iron parts. Metal does not constitute a consolidated and unbroken structure, but appears in the form of larger or smaller fragments of meteorite iron melted into a mass of silicate minerals.

Halite crystals on the watering can

A wooden watering can, covered with salt crystals, is undoubtedly an original, but also a typical, object. Many of the objects left by the miners in the mine, especially those that were sunk in brine (salt water), changed their appearance and...

Halite crystals from Crystal Grottoes

Aggregate, the accumulation of minerals among rocks of different composition and structure, is the dictionary definition of the features of this specimen.

Halite crystals

A beautifully educated crystal seems to be something almost magical. Its transparent regular form immediately raises suspicion about the intentionality of the “creator”. However, the mystery has been revealed long time ago. Each mineral, including halite, is a crystal.

Ammonite “Perisphinctes (Dichotomosphinctes) crotalinus Siemiradzki”

The specimen comes from the historic collection gathered in 1872 by Stanisław Zaręczny. It was marked in 1891 by Józef Siemiradzki as a new specimen (currently holotype) and then described in his publication Fauna kopalna warstw oksfordzkich i kimerydzkich w okręgu krakowskim i przyległych częściach Królestwa Polskiego, Część I: Głowonogi, (The fossil fauna of the Oxfordian and Kimmeridgian layers in the Kraków area and the neighbouring part of the Kingdom of Poland, Part I: Cephalopods) in: Pamiętnik Akademii Umiejętności w Krakowie, Wydział Matematyczno-Przyrodniczy, Vol. 18, issue I.

Ammonite mineralised with quartz and chalcedony

Presented ammonite is unique, because of its individual mineralization, which is very rarely in the singular objects from this area. Mineralization with chalcedony and quartz, on line of the helix, created holes with a rich and colorful cross-section. Thanks to this...

Sphalerite

Presented specimen is unique because of the locus of occurrence holomorphic zinc and lead ores. It takes the form of fine-grained, dense masses, which, after surface polishing, are very effective - as in the case of our sphalerite.

Calcite with marcasite

Presented specimen is a dense and grainy aggregate of marcasite, on which surface grown the crystals of calcite.

Halite with organic inclusions

This specimen from the collection of The Geological Museum of the AGH University of Science and Technology is unusual, because in its crystal structure is a foreign body. This phenomenon is called inclusion (known as organic infix too). Inclusion has its strict regularities, for example – the presence of another mineral in the mineral, like diamond in a diamond structure. Sometimes, completely by accident...

Septarian concretion of polygonal pattern

Septarian, marlite or clayish and ferruginous concretion is a type of spherical, elliptical or lens-shaped aggregate of minerals occurring within sedimentary rocks, e.g. loam.

Calcite (“druse”)

Calcite is a mineral of the carbonate class, also known as calcium carbonate. Its name derives from the Greek word chalix and the Latin word calx (calcis) – meaning calcium, which is a reference to the traditional application of this mineral. It develops isometric, plate, prism and needle crystals.

Limonite dripstone

Limonite (brown iron ore) is a fine-grained or cryptocrystalline mixture of iron oxides and hydroxides which used to be regarded as a separate mineral, and now it is regarded as a type of rock. It is mainly made of goethite, a mineral of the hydroxide class.

Cellular limonite

Limonite (a brown iron ore) is a fine-grained or cryptocrystalline mixture of iron oxides and hydroxides which used to be regarded as a separate mineral, but now is regarded as a type of rock. Limonite's name derives from the Greek word λειμωυ, meaning meadow, and is a reference to its common occurrence in the form of turf ores in wetlands.

Grinder of a mammoth “Mammuthus Primigenius”

The presented object is a grinder of a woolly mammoth (Mammuthus Primigenius) – an extinct herbivorous mammal of the elephantine family.

“Kidney-shaped” malachite

Malachite is a mineral of the carbonate class, one of the most common minerals and it is widely spread throughout the Earth’s crust. From antiquity, it has been valued as an ornamental stone, amulet and as a medicine. Malachite has been used to produce jewellery, household goods, facing plates used for interior finishing, as well as green dyes and paints.

Ferruginous quartz

Quartz is a mineral belonging to the silicate group, mainly made of silicon dioxide. It is one of the most abundant rock-forming minerals present in the Earth’s crust. It is a brittle and transparent mineral. It can develop numerous colour variants, depending on its composition. It can be colourless, as well. Such quartz is called rock crystal.

Star-shaped quartz

Quartz is a mineral belonging to the silicate group, mainly made of silicon dioxide. It is one of the most abundant rock-forming minerals present in the Earth’s crust. It is a brittle and transparent mineral. It can develop numerous colour variants, depending on its composition. It can be colourless, as well. Such quartz is called rock crystal.

Sphalerite — Galena

Sphalerite is a zinc blende; and galena, is a lead sulfide (lat. galena means lead ore), both are common minerals from the class of sulphide.

Marcasite from “Pomorzany” Coalmine

Marcasite is a common mineral, which is finding mainly in sedimentary rocks, like limestones, marls or clayey rocks. It belongs to the class of sulphides. Marcasite at increased temperatures undergoes irreversibly in pyrite, because it is a impermanent form of pyrite. Marcasite and pyrite are polymorphic variants of iron sulfide. It has a brass-yellow color with a greenish tinge and a metallic sheen.