Difference between revisions of "Shell"
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== Physical and Chemical Properties == | == Physical and Chemical Properties == | ||
* Reacts with acids to evolve carbon dioxide. | * Reacts with acids to evolve carbon dioxide. | ||
| − | * Aragonite is harder and denser than calcite | + | * Aragonite is harder and denser than calcite |
| − | * Fracture = | + | * Fracture = uneven to splinter |
| − | * Luster = | + | * Luster = greasy or pearly |
| − | |||
* Streak = white | * Streak = white | ||
* Fluorescence = variable | * Fluorescence = variable | ||
| − | * Birefringence = strong showing interference colors | + | * Birefringence = strong (0.155) showing interference colors |
* Straight extinction | * Straight extinction | ||
| Line 34: | Line 33: | ||
|- | |- | ||
! scope="row"| Refractive Index | ! scope="row"| Refractive Index | ||
| − | | 1.530 | + | | 1.530 - 1.686 |
|} | |} | ||
| + | |||
==Resources and Citations== | ==Resources and Citations== | ||
Revision as of 12:34, 16 December 2022
Description
The hard outer covering or case of an animal, mollusk, insect, nut, or egg.
For more information see Eggshell, Seashell, Oyster shell, Tortoiseshell, and Walnut shell.
Synonyms and Related Terms
shells; seashell; tortoiseshell; eggshell; coquille (Fr.)
Risks
- No significant hazards.
- ThermoFisher: SDS
Physical and Chemical Properties
- Reacts with acids to evolve carbon dioxide.
- Aragonite is harder and denser than calcite
- Fracture = uneven to splinter
- Luster = greasy or pearly
- Streak = white
- Fluorescence = variable
- Birefringence = strong (0.155) showing interference colors
- Straight extinction
| Mohs Hardness | 3.5 - 4.0 |
|---|---|
| Density | 2.93-2.95 g/ml |
| Refractive Index | 1.530 - 1.686 |
Resources and Citations
- Oppi Untracht, Jewelry Concepts and Technology, Doubleday & Co., Inc., New York City, 1985
- Jack Odgen, Jewellery of the Ancient World, Rizzoli International Publications Inc., New York City, 1982
- A.Lucas, J.R.Harris, Ancient Egyptian Materials and Industries, Edward Arnold Publishers Ltd., London, 4th edition, 1962
- Art and Architecture Thesaurus Online, http ://www.getty.edu/research/tools/vocabulary/aat/, J. Paul Getty Trust, Los Angeles, 2000