Educational Collection: Streak color (9 minerals)

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.

Unglazed porcelain tile for determining the streak color (powder color) of a mineral. For light-colored minerals, we recommend a black streak plate, a white plate is suitable for dark minerals in order to clearly see the streak.Size: 50 x 50 x 3 mmColor: whiteMaterial: hard porcelainColors on product pictures may differ from those of the original product due to technical reasons. Our images are for reference only, upon purchase you will receive one product of equivalent quality.

Unglazed porcelain tile for determining the streak color (powder color) of a mineral. A white plate is suitable for dark minerals in order to clearly see the streak. For light-colored minerals, we recommend a black streak plate.Size: 50 x 50 x 3 mmColor: blackMaterial: hard porcelainColors on product pictures may differ from those of the original product due to technical reasons. Our images are for reference only, upon purchase you will receive one product of equivalent quality.