Difference between revisions of "Jasper"
From The Gemology Project
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==Poppy Jasper== | ==Poppy Jasper== | ||
"Poppy Jaspers" are jaspers showing red orbicular patterns resembling poppies, hence the name. The best varieties come from Northern California, close to the S. Andreas Fault system (Morgan Hill and Guadalupe). | "Poppy Jaspers" are jaspers showing red orbicular patterns resembling poppies, hence the name. The best varieties come from Northern California, close to the S. Andreas Fault system (Morgan Hill and Guadalupe). | ||
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− | + | <gallery widths=240px heights=240px perrow=3 caption="Guadalupe Poppy Jasper, California"> | |
− | + | Image:Jsp0003.JPG|Guadalupe poppy jasper cab. | |
+ | Image:Jsp0002.JPG|Guadalupe poppy jasper cab. | ||
+ | Image:P1040038.JPG|Guadalupe poppy jasper slab. | ||
+ | </gallery> | ||
+ | <br /> | ||
+ | |||
<br clear="left" /> | <br clear="left" /> | ||
+ | |||
+ | <gallery widths=240px heights=240px perrow=3 caption="Morgan Hill Poppy Jasper, California"> | ||
+ | Image:Mhpj2.JPG|Morgan Hill poppy jasper cab. | ||
+ | Image:Mhpj3.JPG|Morgan Hill poppy jasper. Details of the orbicular structures. | ||
+ | Image:Mhpj1.JPG|Morgan Hill poppy jasper slab. | ||
+ | </gallery> |
Latest revision as of 08:21, 11 May 2012
Jasper | |
---|---|
Chemical composition | SiO2 Silicon dioxide |
Crystal system | Trigonal |
Habit | Aggregate, massive |
Fracture | Conchoidal |
Hardness | 6.5-7 |
Refractive index | 1.53-1.54 |
Specific gravity | 2.58-2.64 |
Lustre | Vitreous |
Scenic jasper
Picture, or scenic, or landscape jasper and agate gets its name from the pictures of scenes, animals or objects formed by the colorful patterns from other minerals present.
Poppy Jasper
"Poppy Jaspers" are jaspers showing red orbicular patterns resembling poppies, hence the name. The best varieties come from Northern California, close to the S. Andreas Fault system (Morgan Hill and Guadalupe).