Difference between revisions of "Ruby"

Latest revision as of 13:55, 10 December 2022

Ruby pin
MFA# 2005.572

Description

Uncut ruby

A red transparent Gemstone composed of Corundum (aluminum oxide). Rubies range in color from a deep rose red to a pale pink due to small amounts of Chromium impurities. They are primarily found in Myanmar (formerly Burma), Kashmir, India, Sri Lanka, Thailand, Zimbabwe, Tanzania, Kenya, Madagascar and the U.S.(North Carolina). Rubies were rarely used in antiquity, probably because of their rarity and extreme hardness. A large clear ruby is more valuable than a diamond of equivalent size. Synthetic rubies were first made in 1837 by fusing aluminum oxide with chromium oxide. They are used in watches, scientific instruments, masers, and lasers.

Synonyms and Related Terms

red corundum; aluminum oxide; pigeon blood; rubin (Dan., Pol., Sven.); Rubin (Deut.); rubis (Fr.); robijn (Ned.); rubi (Esp.,Port.)

Cut ruby

Raman

Physical and Chemical Properties

Composition = Al₂O₃::Cr
Trigonal crystal system. Strongly pleochroic.
Fracture= uneven or conchoidal.
Streak = white.
Luster = vitreous.
With high temperatures, ruby becomes green but returns to red on cooling.
Fluoresces a weak to vivid red. May phosphoresce.
Mohs Hardness = 9.0
Density = 3.96-4.05 g/ml
Refractive Index = 1.76-78
Birefringence = 0.008 - 0.010

Comparisons

Properties of Common Gemstones

Resources and Citations

Gem Identification Lab Manual, Gemological Institute of America, 2016.
G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 682
Jack Odgen, Jewellery of the Ancient World, Rizzoli International Publications Inc., New York City, 1982
R.F.Symmes, T.T.Harding, Paul Taylor, Rocks, Fossils and Gems, DK Publishing, Inc., New York City, 1997
A.Lucas, J.R.Harris, Ancient Egyptian Materials and Industries, Edward Arnold Publishers Ltd., London, 4th edition, 1962 Comment: 500-50 BC
Encyclopedia Britannica, http://www.britannica.com Comment: "ruby." (Accessed 14 Sept. 2005)
C.W.Chesterman, K.E.Lowe, Audubon Society Field Guide to North American Rocks and Minerals, Alfred A. Knopf, New York, 1979
Wikipedia: http://en.wikipedia.org/wiki/Ruby (Accessed Sept. 14, 2005)
Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
Van Nostrand's Scientific Encyclopedia, Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976
The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998

@@ Line 1: / Line 1: @@
-[[File:2005.572-SC167747.jpg|thumb|'''MFA Acc. #:''' 2005.572]]
+[[File:2005.572-SC167747.jpg|thumb|Ruby pin<br>MFA# 2005.572]]
 == Description ==
+[[File:rubycrystalwk.jpg|thumb|Uncut ruby]]
+A red transparent [[gemstone|gemstone]] composed of [[corundum|corundum]] (aluminum oxide). Rubies range in color from a deep rose red to a pale pink due to small amounts of [[chromium|chromium]] impurities. They are primarily found in Myanmar (formerly Burma), Kashmir, India, Sri Lanka, Thailand, Zimbabwe, Tanzania, Kenya, Madagascar and the U.S.(North Carolina).  Rubies were rarely used in antiquity, probably because of their rarity and extreme hardness. A large clear ruby is more valuable than a diamond of equivalent size. Synthetic rubies were first made in 1837 by fusing aluminum oxide with chromium oxide. They are used in watches, scientific instruments, masers, and lasers.
-A red transparent [http://cameo.mfa.org/materials/fullrecord.asp?name=gemstone gemstone] composed of [http://cameo.mfa.org/materials/fullrecord.asp?name=corundum corundum] (aluminum oxide). Rubies range in color from a deep rose red to a pale pink due to small amounts of [http://cameo.mfa.org/materials/fullrecord.asp?name=chromium chromium] impurities. They are primarily found in Myanmar (formerly Burma), Kashmir, India, Sri Lanka, Thailand, Zimbabwe, Tanzania, Kenya, Madagascar and the U.S.(North Carolina).  Rubies were rarely used in antiquity, probably because of their rarity and extreme hardness. A large clear ruby is more valuable than a diamond of equivalent size. Synthetic rubies were first made in 1837 by fusing aluminum oxide with chromium oxide. They are used in watches, scientific instruments, masers, and lasers.
-[[File:rubycrystalwk.jpg|thumb|Uncut ruby]]
 == Synonyms and Related Terms ==
 red corundum; aluminum oxide; pigeon blood; rubin (Dan., Pol., Sven.); Rubin (Deut.); rubis (Fr.); robijn (Ned.); rubi (Esp.,Port.)
+[[File:Cut_Rubywk.jpg|thumb|Cut ruby]]
-[[[SliderGallery rightalign|CorundumRubyitaly1.jpg~Raman]]]
+[[[SliderGallery rightalign|Ruby, 785nm, 100mw.TIF~Raman]]]
+== Physical and Chemical Properties ==
-== Other Properties ==
+* Composition = Al<sub>2</sub>O<sub>3</sub>::Cr
+* Trigonal crystal system. Strongly pleochroic.
-Trigonal crystal system. Strongly pleochroic. Fracture= uneven or conchoidal.
+* Fracture= uneven or conchoidal.
+* Streak = white.
-Streak = white.  Luster = vitreous.
+* Luster = vitreous.
+* With high temperatures, ruby becomes green but returns to red on cooling.
-With high temperatures, ruby becomes green but returns to red on cooling.    Fluoresces and phosphoresces a vivid red.
+* Fluoresces a weak to vivid red. May phosphoresce.
+* Mohs Hardness = 9.0
-{| class="wikitable"
+* Density = 3.96-4.05 g/ml
-|-
+* Refractive Index = 1.76-78
-! scope="row"| Composition
+* Birefringence = 0.008 - 0.010
-| Al2O3::Cr
-|-
-! scope="row"| Mohs Hardness
-| 9.0
-|-
-! scope="row"| Density
-| 3.96-4.05
-|-
-! scope="row"| Refractive Index
-| 1.76-78
-|}
 == Comparisons ==
 [[media:download_file_436.pdf|Properties of Common Gemstones]]
+==Resources and Citations==
+* Gem Identification Lab Manual, Gemological Institute of America, 2016.
-== Additional Images ==
+* G.S.Brady, ''Materials Handbook'', McGraw-Hill Book Co., New York, 1971  Comment: p. 682
+* Jack Odgen, ''Jewellery of the Ancient World'', Rizzoli International Publications Inc., New York City, 1982
-<gallery>
+* R.F.Symmes, T.T.Harding, Paul Taylor, ''Rocks, Fossils and Gems'', DK Publishing, Inc., New York City, 1997
-File:Cut_Rubywk.jpg|Cut ruby
+* A.Lucas, J.R.Harris, ''Ancient Egyptian Materials and Industries'', Edward Arnold Publishers Ltd., London, 4th edition, 1962  Comment: 500-50 BC
-</gallery>
+* ''Encyclopedia Britannica'', http://www.britannica.com  Comment: "ruby." (Accessed 14 Sept. 2005)
+* C.W.Chesterman, K.E.Lowe, ''Audubon Society Field Guide to North American Rocks and Minerals'', Alfred A. Knopf, New York, 1979
+* Wikipedia: http://en.wikipedia.org/wiki/Ruby (Accessed Sept. 14, 2005)
-== Authority ==
+* Richard S. Lewis, ''Hawley's Condensed Chemical Dictionary'', Van Nostrand Reinhold, New York, 10th ed., 1993
-* G.S.Brady, G.S.Brady, ''Materials Handbook'', McGraw-Hill Book Co., New York, 1971  Comment: p. 682
-* Jack Odgen, Jack Odgen, ''Jewellery of the Ancient World'', Rizzoli International Publications Inc., New York City, 1982
-* R.F.Symmes, T.T.Harding, Paul Taylor, R.F.Symmes, T.T.Harding, Paul Taylor, ''Rocks, Fossils and Gems'', DK Publishing, Inc., New York City, 1997
-* A.Lucas, J.R.Harris, A.Lucas, J.R.Harris, ''Ancient Egyptian Materials and Industries'', Edward Arnold Publishers Ltd., London, 4th edition, 1962  Comment: 500-50 BC
-* ''Encyclopedia Britannica'', http://www.britannica.com  Comment: "ruby." Encyclopdia Britannica. 14 Sept. 2005 .
-* C.W.Chesterman, K.E.Lowe, C.W.Chesterman, K.E.Lowe, ''Audubon Society Field Guide to North American Rocks and Minerals'', Alfred A. Knopf, New York, 1979
-* Wikipedia, the free encyclopedia, at http://www.wikipedia.com  Comment: http://en.wikipedia.org/wiki/Ruby (Accessed Sept. 14, 2005)
-* Richard S. Lewis, Richard S. Lewis, ''Hawley's Condensed Chemical Dictionary'', Van Nostrand Reinhold, New York, 10th ed., 1993
 * ''Van Nostrand's Scientific Encyclopedia'', Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976
 * ''The American Heritage Dictionary'' or ''Encarta'', via Microsoft Bookshelf 98, Microsoft Corp., 1998