Difference between revisions of "Shell"

Latest revision as of 13:37, 16 December 2022

Conch shell trumpet
MFA# 1988.1214

Mask with shells
MFA# 1994.420

( Biology) The hard outer covering or case of an animal, mollusk, insect, nut, or egg.

shells; seashell; tortoiseshell; eggshell; coquille (Fr.)

Gem Identification Lab Manual, Gemological Institute of America, 2016.
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

@@ Line 9: / Line 9: @@
 shells; seashell; tortoiseshell; eggshell; coquille (Fr.)
-[[[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==