Difference between revisions of "Seashell"
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sea shell; nacre (Fr.); oyster shells; concha marinha (port.); | sea shell; nacre (Fr.); oyster shells; concha marinha (port.); | ||
| + | [[[SliderGallery rightalign|Aragonite 2.TIF~FTIR (MFA)|Aragonite (HU Min. Museum 116189), 50X, 785 nm copy.tif~Raman (MFA)|aragonite.jpg~Chemical structure]]] | ||
| + | == Risks == | ||
| + | * No significant hazards. | ||
| + | * ThermoFisher: [https://www.fishersci.com/store/msds?partNumber=AC423510025&productDescription=CALCIUM+CARBONATE+99%2BACS+2.5KG&vendorId=VN00032119&countryCode=US&language=en 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 | ||
| + | |||
| + | {| class="wikitable" | ||
| + | |- | ||
| + | ! scope="row"| Mohs Hardness | ||
| + | | 3.5 - 4.0 | ||
| + | |- | ||
| + | ! scope="row"| Density | ||
| + | | 2.93-2.95 g/ml | ||
| + | |- | ||
| + | ! scope="row"| Refractive Index | ||
| + | | 1.530 - 1.686 | ||
| + | |} | ||
==Resources and Citations== | ==Resources and Citations== | ||
| − | + | * Gem Identification Lab Manual, Gemological Institute of America, 2016. | |
* Richard S. Lewis, ''Hawley's Condensed Chemical Dictionary'', Van Nostrand Reinhold, New York, 10th ed., 1993 | * Richard S. Lewis, ''Hawley's Condensed Chemical Dictionary'', Van Nostrand Reinhold, New York, 10th ed., 1993 | ||
| − | |||
* Oppi Untracht, ''Jewelry Concepts and Technology'', Doubleday & Co., Inc., New York City, 1985 | * 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 | * 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 | * A.Lucas, J.R.Harris, ''Ancient Egyptian Materials and Industries'', Edward Arnold Publishers Ltd., London, 4th edition, 1962 | ||
| − | |||
* ''The American Heritage Dictionary'' or ''Encarta'', via Microsoft Bookshelf 98, Microsoft Corp., 1998 | * ''The American Heritage Dictionary'' or ''Encarta'', via Microsoft Bookshelf 98, Microsoft Corp., 1998 | ||
Revision as of 12:37, 16 December 2022
Description
A hard outer covering of a mollusk. Seashells are composed primarily of calcium carbonate (Aragonite) bound with chitin. Some seashells, such as abalone, pearl oyster and mussel, have a hard iridescent inner layer. The iridescence is caused by the interference of light waves reflected between the thin overlapping layers. Seashells are soft and easily cut or carved. They have been used for beads, amulets and decoration since ancient times in both Eastern and Western cultures.
Synonyms and Related Terms
sea shell; nacre (Fr.); oyster shells; concha marinha (port.);
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
- Gem Identification Lab Manual, Gemological Institute of America, 2016.
- Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
- 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
- The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998