Iceland Spar Polished XL

Calcite / Iceland Spar AA
Super quality. the clearest calcite / double-spade in the world (at least the clearest I have ever seen in international trade in 20 years of trading) Editor's note, M Lay)
Fine polish, even that is not easy with calcite, usually even the edges are still phased.
Often used in class to demonstrate the double effect.
ideal size for demonstration
Size: about  35X40 * 25mm

If you place double spar / Iceland Spar on writing, you will see the font doubled.
Doppelspar / Iceland Spar is a calcite. Mainly it is known in white clear to milky. Birefringence is an important feature of calcite. By this it is meant that light, which meets the calcite at a certain angle, is split into two light bundles. The two rays are broken differently. The effect we can all see is that everything seen through the calcite at a certain angle is duplicated.
Therefore, the double spar has the first part of its name. He doubles everything by splitting the light! The calcite is also called calcite, whereby the Iceland Spar / Doppelspat has the second half of its name.
The Iceland Spar / Doppelspat is thus a Calcit, which is honed in a certain angle. The double latex is a calcite cut to the exact angle, showing everything that it lies on twice.
The Iceland Spar / Doppelspat is ground in the shape of a prism. Six parallelograms form the body of the Iceland Spar / Doppelspat. Often it is broken and sharp-edged, causing it to splinter.
Our double-spade trim has rounded edges, making it comfortable to hold.

Iceland Spar / Double latex, a special calcite, with polished edges, polished. AA + quality
Iceland Spar / Doppelspar is a calcite called calcite that doubles everything.