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Chemical formula
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Al 2 OSiO 4 |
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Crystalline system
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orthorhombic |
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Class
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Silicate |
| Origin | Boal, Asturias, Spain |
| Size | 2.0-3.0cm |
Well formed Chiastolite crystals. Chiastolite is a variety of andalusite and is characterized by a curious carbonaceous inclusion (of graphite) that draws a cross in the center of the mineral.
Also known as "The Celtic Cross" or "Cruz de Asturias" for its resemblance to the symbols, these gems are often polished for jewelry and other ornamental purposes.
The mineral includes a label with the name and origin and is attached to a cardboard box. 4 cm square.
*The price is per unit (a single cardboard box of the four shown in the photo)
Since the minerals are natural, you will receive a piece similar to the one in the photograph. The minerals come in cardboard boxes and are glued to a porex base with hot silicone; these can be removed using ethyl alcohol without damaging the mineral. The size is approximate.