Difference between revisions of "Template:Chalcedony"
From The Gemology Project
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| Crystal system || Trigonal | | Crystal system || Trigonal | ||
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− | | Habit || | + | | Habit || Aggregate |
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− | | Fracture || | + | | Fracture || Conchoidal |
|- | |- | ||
| Hardness || 6.5-7 | | Hardness || 6.5-7 |
Latest revision as of 17:59, 22 December 2006
Chalcedony | |
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Chemical composition | Silicon dioxide SiO2 |
Crystal system | Trigonal |
Habit | Aggregate |
Fracture | Conchoidal |
Hardness | 6.5-7 |
Refractive index | 1.535 - 1.539 |
Specific gravity | 2.60 |
Lustre | Vitreous |