These beautiful Calcite Rhombs are mined in the desert region of Santa Eulalia, Chihuahua, Mexico. Yes, they come out of the ground shaped like a rhombohedron! Calcite rhombs also have what is called "double refraction". If you place one over, for example, written or typed text you see double characters!
These are the highest grade optical calcite's available. Also, while I do not guarantee every piece will have it, most of them display rainbow effects in the sunlight and some have stair step crystallization pattern in the crystal.
You will receive a specimen 3 inch to 3 1/2 inch and weighing between 9 and 13 ounces.
Bulk Purchase Specimen
are buying one rock. You will receive a rock like the ones in the
photographs, not the exact rock shown. The photograph with multiple
rocks is so you can see the range of differences in this bulk purchase
specimen listing. Photographing and listing every rock separately adds a
lot in labor costs. We pass that savings on to you with lower prices
and higher quality than the competition.
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At Kidz Rocks You Get More!
Larger rocks, lower prices, best service AND we add a FREE sample surprise specimen to every order.
Calcite Rhomb, also called Iceland spar, is a transparent variety of calcite, or crystallized calcium carbonate, originally brought from Iceland, and used in demonstrating the polarization of light. It occurs in large readily cleavable crystals, easily divisible into rhombs, and is remarkable for its double refraction or in other causes objects viewed through a clear piece of calcite to appear doubled.
Historically, the phenomena of this crystal were studied at length by Isaac Newton. It has been speculated that the Viking sunstone mentioned in medieval Icelandic texts was Iceland spar and that Vikings used its light-polarizing property to tell the direction of the sun on cloudy days, for navigational purposes.