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Jasper

Jasper is an opaque, impure Chalcedony, usually red but also yellow, green, and grayish blue. Association with other minerals gives jasper nice bands and patterns. In the ancient world Jasper was a favorite gem. We can find the name jasper in ancient Hebrew, Assyrian, Greek, and Latin. Jasper is usualy named according to its pattern: picture jasper, ribbon jasper, and orbicular jasper. The most popular - landscape jasper, looks like a small worldscape. Jasper is found in many countries. Bowls and other objects sometimes are made of jasper.

Jasper - Main Characteristics

ClassificationMineral
Hardness (Mohs Scale)7
Molecular formulaSiO2
CompositionTectosilicate.
Crystal ShapeCompressed microgranular quartz.
Color/SpectrumRed, dark red and yellow gamma.
Atomic (Crystal )Structure Symmetrical.
Index of Refraction1.55-1.56
Density (Relative)2.48 - 2.52
Light interactionvitreous to waxy
UsesJewelry, ornamental, decorative.

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