Educational collection: Electrical & magnetic properties

10 MineralsSpecimens: 20 x 20 mm eachin a segmented plastic collector’s boxThe optical properties refer to how light interacts with minerals when observed using various optical techniques. These properties include, for example, transparency, birefringence, pleochroism, and iridescence, which are demonstrated here on selected specimens.This collection is numbered according to the list of contents.Our collections are handcrafted by Dr. F. Krantz in Bonn.  Please note minerals are natural products and no two specimens will ever look exactly alike.Due to technical limitations, colors in product photos may vary slightly from those of the actual specimen.Our images are intended as reference; upon purchase, you will receive a collection of equivalent quality.

15 MineralsHandpiece: approx. 20 x 20 mmin a divided plastic caseThis collection demonstrates the fluorescent properties of certain minerals.The visible glow of some minerals under UV light is called fluorescence. A distinction is made between short-wavelength (approx. 254 nm) and long-wavelength (approx. 366 nm) UV rays, which can produce different colors.The specimens are numbered according to the list of contents.Our collections are handcrafted by Dr. F. Krantz in Bonn.  Please note that minerals are natural products and no two pieces will everlook exactly alike.Due to technical limitations, colors in product photos may vary slightly from those of the actual piece.Our images are intended as reference; upon purchase, you will receive a collection of equivalent quality.

15 mineralsspecimens: approx. 20 x 20 mm eachin a plastic collection box with 16 compartments A collection that demonstrates the different specific weights of minerals.  From extremely light specimens such as carnalite, to medium-weight specimens such as calcite and fluorite, to extremely heavy minerals such as cinnabar. This classroom collection is delivered in a compartmentalized collection box.  The specimens are numbered according to a contents list that includes all relevant data. Our collections are handcrafted at our premises at Dr. F. Krantz in Bonn. Please note that minerals are natural products and no two pieces are ever exactly alike. Colors in product photos may vary slightly from those of the actual specimen due to technical reasons. Our images are for reference; upon purchase, you will receive a collection of equivalent quality.

9 mineralsspecimens: 20 x 20 mm each in a plastic case with 10 compartments includes a streak plate In mineralogy, the term “streak color” or simply “streak” refers to the color of the powder produced when a mineral is rubbed against a rough, unglazed  porcelain surface—such as a streak plate. It is a common method for identifying specimens that appear similar in color. This classroom collection is used to compare the streak color with the intrinsic color of minerals. It comes with a porcelain streak plate.The specimens are numbered according to the contents list. Our collections are handcrafted by Dr. F. Krantz in Bonn.  Please note that minerals are natural products and no two specimens will ever look exactly alike. Due to technical limitations, colors in product photos may differ slightly from those of the actual specimen. Our images are for reference; upon purchase you will receive a collection of equivalent quality.

10 mineralsspecimens of various sizesin durable plastic collection boxBased on the well-known computer game, we present the large Minecraft collection in a protective collector's case.Discover what the materials look like away from the screen!The rocks come with an accompanying text that includes the locality where they were found and describes the type of rock.Included: lapis lazuli, obsidian, coal, lava, iron-bearing rock, jasper, and even gold and emerald.Box size: 210 x 70 mmOur collections are handcrafted here in Bonn.Please note that rocks are natural products and no two pieces will everlook exactly alike.Due to technical limitations, colors in product photos may vary slightly from those of the actual item.Our images are for reference only; when you purchase, you will receive a collection of equivalent quality.

20 rock specimensSpecimen size: 20x20 mmsupplied in a compartmentalized plastic case This collection was created to illustrate basic petrographic concepts.  It features twenty typical examples of igneous, sedimentary, and metamorphic rocks. Distributing several collections among the students creates ideal conditions for engaging petrography lessons. The specimens are numbered according to an explanatory list of contents.Our collections are handcrafted at Dr. F. Krantz in Bonn. Please note that rocks are natural products and no two specimens are ever exactly alike.Colors in product photos may vary slightly from those of the actual specimen due to technical reasons. Our images are provided as reference; upon purchase you will receive one collection of equivalent quality.

10 rock-forming minerals30 rock samples specimen size: approx. 20 x 20 mmin two plastic collection boxes With its combination of 10 rock-forming minerals and 30 rock samples, this collection explains the most important concepts in petrography and allows interested individuals to independently practice rock identification exercises. An affordable collection, ideal for use in school classrooms. The collection is delivered in two sturdy plastic boxes. All specimens are numbered according to an explanatory list of contents. Our collections are handcrafted at Dr. F. Krantz in Bonn. Please note that minerals are natural products and no two specimens are ever exactly alike. Colors in product photos may vary slightly from those of the actual product due to technical reasons. Our images are for reference; upon purchase, you will receive a collection of equivalent quality.

20 rock-forming mineralsSpecimens: approx. 20 x 20 mmin a plastic collector's boxcan be paired with P05This collection contains: quartz, microcline, albite, leucite, sodalite, diopside, augite, actinolite, hornblende, olivine, muscovite, biotite, calcite, magnesite, andalusite, sillimanite, disthene, staurolite, epidote, and garnet.The pieces are numbered according to an explanatory list of contents.Our collections are handcrafted in our workshop in Bonn. Please note that rocks are natural products and no two pieces will ever look exactly alike.Colors in product photos may vary slightly from those of the actual piece due to technical reasons. Our images are provided as reference; upon purchase, you will receive a collection of equivalent quality.