Educational collection: Specific gravity (15 minerals)

The Mohs scale of mineral hardness is a helpful tool when identifying minerals.It is based on the ability of one natural sample of mineral to visibly scratch another mineral. Small hardness scale with reference minerals of hardness 1 to 9, a white streak plate, an explanatory list, and instructions. Delivered in a plastic collection box.Handcrafted at Dr. F. Krantz, Bonn, Germany. Size minerals: approx. 2 x 2 cmSize box: 22 x 7.5 x 3 cmColors on our productphotos may differ from those of the original product due to technical reasons.Our pictures are for reference, upon purchase you receive one product of equivalent quality.

12 mineralshand pieces: approx. 20 x 20 mmin plastic collector's caseThis educational collection presents the most important types of cleavage on the basis of 12 minerals. It is delivered in a compartmented plastic case. The pieces are about 2 x 2 cm and numbered according to the contents list.

6 mineralshand pieces: approx. 20 x 20 mmin plastic collector's caseThis educational collection of 6 specimens is illustrating the  most important types of irregular fractures: conchoidal, even, uneven, hackly, splintery and earthy. All hand pieces are about 2 x 2 cm and numbered according to the contents list.

7 mineralshandpieces: approx. 20 x 20 mmin plastic collector's caseThis educational collection is used to show the different behavior of minerals under pressure and tensile action. It comes in a plastic case with compartments. The pieces are about 2 x 2 cm and numbered according to the contents list.

12 mineralshand pieces: approx. 20 x 20 mmin plastic collector's caseA training collection with representation of the different luster types as well as luster quality (metal, diamond, glass, fat, mother-of-pearl, porcelain and silk luster; matte - splendid). The pieces are about 2 x 2 cm and numbered according to the contents list.

10 mineralsHandpiece: 20 x 20 mmin plastic collector's boxTransparency, birefringence, pleochroism and color iridescence are demonstrated on selected pieces. This study collection comes in a compartmented plastic case. The specimens are approximately 2 x 2 cm and numbered according to the contents list.

15 mineralsHandpiece: approx. 20 x 20 mmin subdivided collector's boxThis study collection shows the fluorescent properties of certain minerals. It is delivered in a collector's plastic case. The pieces are about 2 x 2 cm and numbered according to the contents list.

18 mineralshandpiece: approx. 20 x 20 mmin plastic collector's boxThis study compilation shows dia-, para-, as well as ferromagnetism, pyro-, and piezoelectricity as well as examples of conductors, non-conductors, and insulators on the basis of various minerals. The pieces are about 2 x 2 cm and numbered according to the contents list.

9 mineralshandpiece: 20 x 20 mmin plastic caseincluding line chartThis educational collection is for checking the line versus intrinsic color of minerals. It comes in fanned plastic case and with a porcelain line chart. The pieces are about 2 x 2 cm and numbered according to the contents list.

7 mineralsHandpieces of different sizesin folded boxesDeveloped to match the computer game of the same name, this collection shows how the respective minerals look in reality off the screen.With accompanying text, place of discovery and description, which rock it is.Included: lapis lazuli, obsidian, coal, lava, ferruginous rock, jasper 

10 mineralsHand pieces of different sizesin plastic collector's boxDeveloped for the computer game of the same name, we present the large Minecraft collection in a sturdy plastic collector's box.Discover what the rocks look like in reality away from the screen!The minerals are supplied with an accompanying text, indication of the place of discovery and the explanation of which rock it is.Included: lapis lazuli, obsidian, coal, lava, ferruginous rock, jasper and even gold and emerald.Size of the box: 210 x 70 mm.

This collection was created to explain basic petrographic terms. It contains twenty typical representatives of igneous, sedimentary and metamorphic rocks. Distributed in several copies among the students, this inexpensive collection offers the best conditions for illustrative teaching.The pieces are numbered according to an explanatory list of contents.Contents: 20 rocksSize: approx. 2 x 2 cm eachSupplied in a durable plastic box.Colors in product photos may differ slightly from those of the original product due to technical reasons.Our pictures are for reference only, when purchasing you will receive a piece of equivalent quality.

10 rock-forming minerals30 rocksHand pieces: approx. 20 x 20 mmSupplied in two plastic collector's boxes.With the combination of 10 rock-forming minerals and 30 rocks, this collection explains the most important aspects of petrography and allows the student to work independently on initial rock identification exercises.An affordable collection, e.g. for use in the classroom.The approximately 2 x 2 cm pieces are numbered according to an explanatory list of contents.Colors in product photos may differ slightly from those of the original product for technical reasons.Our pictures are for reference only, when purchasing you will receive a piece of equivalent quality.

20 rock forming mineralsin plastic collector's boxHandpiece: approx. 20 x 20 mmContains: Quartz, microcline, albite, leucite, sodalite, diopside, augite, actinolite, hornblende, olivine, muscovite, biotite, calcite, magnesite, andalusite, sillimanite, disthene, staurolite, epidote and garnet. The collections come in sturdy compartmented plastic boxes. The pieces, measuring about 2 x 2 cm, are numbered according to an explanatory contents list.This collection can also be combined with P05.